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  • 1.
    Forsberg, Inger
    et al.
    Swedish National Road and Transport Research Institute.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Tillståndsmätning av observationssträckor med Laser RST2000Report (Other academic)
    Abstract [sv]

    En mätbil, Laser RST (Road Surface Tester), finns för att mäta vägytans tillstånd. Tillståndet beskrivs genom att mäta vägprofiler längs- och tvärs vägen och därifrån beräkna olika mått, såsom exempelvis spårdjup och IRI (International Roughness Index). Standardmätningar sker i huvudsak enligt Vägverkets regler – Metodbeskrivning 111:1998 ”Bestämning av jämnhet i längsled och tvärled samt tvärfall hos ett vägobjekt med mätbil”. För uppföljning av tillståndet hos observationsobjekt exempelvis ingående i LTPP-projektet (LTPP=Long Term Pavement Performance) utföres mätningarna på utvalda teststräckor i Sverige enligt en speciell metod. Mätmetodiken beskrivs i detta notat.

  • 2.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Beläggningsslitage vintern 2007/2008 på högtrafikerade vägar i Stockholmsområdet2009Report (Other academic)
    Abstract [en]

    For many years, VTI has monitored road surface wear caused by the use of studded tyres. In order to examine current road surface wear from studded tyres, studies were carried out in the Stockholm region of Sweden. The investigations began during winter 2006/2007 and were complimented with further studies during winter 2007/2008. The aim of the investigations was to study - surface wear on the high trafficked routes in and out of Stockholm; - surface wear on relatively new surface courses and on surface courses which have been exposed for up to four years of winter traffic; - the percentage of passenger cars that use stud tyres. The investigation carried out on the routes in and out of Stockholm showed that surface wear has increased in recent years. Vehicles today are causing more surface wear per km compared to a number of years ago. One reason for this is that asphalt aggregates used today are not as proportionally durable than those used previously. This, together with increased traffic volume, means that the level of surface wear (including rutting) caused by studded tyres has increased compared with the early 2000s. According to the 2007/2008 studies, the depth of rutting on the high trafficked road network, caused by studded tyre use, was 2-3.5mm. Estimates have shown that studded tyre use in the Stockholm region of Sweden (November 2007 to April 2008) was on average 53%. This is perhaps a slight reduction in usage compared to previous years.

  • 3.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Kontroll av bindemedelsspridare med ny metod: Inledande försök1989Report (Other academic)
  • 4.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Polering av asfaltbeläggning: friktionsmätningar i Stockholmsregionen : 20092010Report (Other academic)
    Abstract [sv]

    För att studera trafikens poleringseffekt av vägytan, har under sommarhalvåret 2009 ett antal asfaltbeläggningar följts upp med avseende på friktion. Arbetet är en fortsättning på flera års mätningar av friktion på ytor som kan tänkas utsättas för polering. Det handlar om högtrafikerade vägar i Stockholmsområdet företrädesvis med slitlager av skelettasfalt (ABS16). Även några slitlager med inblandning av gummi respektive tunnskikt (TSK16) samt dränerande beläggning (ABD16) ingår i undersökningen. Ballasten består av porfyr eller kvartsit samt blandningar av porfyr och kvartsit eller porfyr och ortens material.

    Mätningarna följer Vägverkets metodbeskrivning för bestämning av friktion på belagd vägyta och avser våtfriktionen vid barmarksförhållanden. Vid mätningarna har VTIs friiktionsmätbil "SAAB Friction Tester" använts. Friktionen har mätts i högra hjulspåret.  

  • 5.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Prognosmodell för spårutveckling orsakad av tung trafik: delmoment för nybyggnation2007Report (Other academic)
    Abstract [sv]

    VTI has, on commission by the Swedish Road Administration, monitored road data from 66 sites and more than 600 test sections since 1987 and the monitoring is still in progress. All data is stored in a Microsoft Access LTPP (Long Time Pavement Performance) data base. Some of this data has been used in this project with the aim to develop a model to predict rut depth caused by heavy traffic. This project covers only the development of rut depth on new constructed roads. The next phase is to develop a similar model for predicting rut depth after a maintenance measure. The basic data which has been used in the development of the model is response data from Falling Weight Deflection (FWD), rut depth data from a laser equipped high speed measuring vehicle developed at VTI and traffic data describing the amount and configuration of the heavy traffic. The required input data for developing the model was: - The date of the opening of the road for traffic - FWD data one year after the opening of the road - Rut depth data collected every year - The equivalent number of standard axles passed on the roads co-ordinated with the monitoring of the rut depth. In the data base there is data from 66 sites with different types of pavement structures. For the purpose of this project data from 15 sites with 121 sections with the length of 100 metres were used. During the model development work the most significant factor of describing the structural capacity was the Surface Curvature Index (SCI300) which is the difference in deflection between the centre deflection and the deflection at the distance of 300 mm from the centre of the loading plate in the FWD testing.

  • 6.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    TANKvärt från prov-och kontrollsträckor2017Conference paper (Other academic)
  • 7.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2008-122009Report (Other academic)
    Abstract [sv]

    The objective of this project is to collect and deliver high quality road data primarily for the development of performance prediction models. The monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but the number, both active and inactive, has increased to 655 sections distributed over 66 sites. Budget restrictions in 2000 resulted in a decrease in monitoring by 25 per cent. In 2008 there were still 331 active LTPP sections distributed over 35 sites. Road data from this project has been used in the development of flexible pavement models for predicting the cumulative number of load applications to the initiation of cracking and for predicting crack propagation. Crack initiation was defined as the first appearance of cracking in the wheel paths.

  • 8.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2009-122010Report (Other academic)
    Abstract [sv]

    The objective of this project is to collect and deliver high quality road data primarily for the development of performance prediction models. The monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but the number, both active and inactive, has increased to 665 sections distributed over 67 sites. Budget restrictions in 2000 resulted in a decrease in monitoring by 25%. In 2008 there were still 341 active LTPP sections distributed over 36 sites. Road data from this project has been used in the development of flexible pavement models for predicting the cumulative number of load applications to the initiation of cracking and for predicting crack propagation. Crack initiation was defined as the first appearance of cracking in the wheel paths. The models were created using the same approach applied to the development of crack models used in the PARIS (Performance Analysis of Road Infrastructure) project carried out within the 4th European Framework Programme Road Transport 1996-1998.

  • 9.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2010-122011Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for the development of performance prediction models. The monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but the number, both active and inactive, has increased to 665 sections distributed over 67 sites. Budget restrictions in 2000 resulted in a decrease in monitoring by 25%. In 2010 there were still 328 active LTPP sections distributed over 35 sites. Road data from this project has been used in the development of flexible pavement models for predicting the cumulative number of load applications to the initiation of cracking and for predicting crack propagation. Crack initiation was defined as the first appearance of cracking in the wheel paths. The models were created using the same approach applied to the development of crack models used in the PARIS (Performance Analysis of Road Infrastructure) project carried out within the 4th European Framework Programme Road Transport 1996-1998.

  • 10.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2011-122012Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for the development of performance prediction models. The monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but the number, both active and inactive, has increased to 676 sections distributed over 68 sites. Budget restrictions in 2000 resulted in a decrease in monitoring by 25%. In 2011 there were still 314 active LTPP sections distributed over 34 sites.

    Road data from this project has been used in the development of flexible pavement models for predicting the cumulative number of load applications to the initiation of cracking and for predicting crack propagation. Crack initiation was defined as the first appearance of cracking in the wheel paths.

    The models were created using the same approach applied to the development of crack models used in the PARIS (Performance Analysis of Road Infrastructure) project

    carried out within the 4th European Framework Programme Road Transport 1996–1998. The Swedish Road Administration Design Programme has been validated with data

    from the LTPP database.

  • 11.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med 2012-–122013Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for the development of performance prediction models. The monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. In 2012 there were still 304 active LTPP sections distributed over 33 sites. The monitoring programme includes the following activities: • Distress surveys. Annual surveys are carried out by walking over the sections. During the survey all distresses and surface defects are recorded. The grading of the distresses and defects is based on a national distress manual. • Road surface monitoring. The monitoring is carried out every second year using a vehicle developed by VTI. The ‘Laser Road Surface Tester’ can be equipped with up to 19 laser gauges. • Measurement of the bearing capacity. The capacity is calculated with a Falling Weight Deflectometer and normally carried out one year after maintenance measures. The normal strategy is to measure all new sections and after maintenance. • Collection of climate data from automatic weather observation stations close to the sections. • Collection of traffic data normally every fourth year. • Quality control check of all collected data. • Calculation of an annual crack index. The index is calculated from the type of crack, crack distress grade and crack propagation.

  • 12.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med december 20132014Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for use in the development of performance prediction models. Monitoring of the LTPP sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but, in 2013, the number has increased to 681 sections distributed over 64 sites. All sections are included in Sweden’s national road network. During 2014, 302 sections distributed over 32 sites will remain active. An example of use is that in 2000 VTI was commissioned by the Communications Research Board (KFB) to develop crack initiation and propagation models caused by traffic loading. The procedure was similar to the approach applied to the development of crack models used in the PARIS (Performance Analysis of Road Infrastructure) project. The basis of these models was founded upon data collected in this project. Another example is that VTI, commissioned by the then National Road Administration, performed validation of the software tool used for the calculation of road bearing capacity - PMS Object. The first phase included valuation of new construction and was carried out during 2003 and 2004. The second phase evaluated reconstruction and was completed at the start of 2005. In addition, a prediction model for rut depth caused by heavy traffic has also been developed and a report was published in the beginning of year 2007. A current VTI project aims to develop a calculation tool for life cycle cost assessments of various design options in the planning and design of roads. In order to predict future maintenance requirements for various designs options, condition development models are being used to forecast condition and cost requirements during the roads lifecycle. The LTPP database has also been used to help calibrate models for conditions such as rutting, cracking and durability. It has also helped to validate condition development and the need for maintenance action.

  • 13.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med december 20142015Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for use in the development of performance prediction models. Monitoring of the LTPP sections (100 m long) started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but, in 2014, the number has increased to 690 sections distributed over 65 sites. All sections are included in Sweden’s national road network. An example of use is that in 2000 VTI was commissioned by the Communications Research Board (KFB) to develop crack initiation and propagation models caused by traffic loading. The procedure was similar to the approach applied to the development of crack models used in the PARIS (Performance Analysis of Road Infrastructure) project. The basis of these models was founded upon data collected in this project. Another example is that VTI, commissioned by the then National Road Administration, performed validation of the software tool used for the calculation of road bearing capacity – PMS Object. The first phase included valuation of new construction and was carried out during 2003 and 2004. The second phase evaluated reconstruction and was completed at the start of 2005. In addition, a prediction model for rut depth caused by heavy traffic has also been developed and a report was published in the beginning of year 2007. A current VTI project aims to develop a calculation tool for life cycle cost assessments of various design options in the planning and design of roads. In order to predict future maintenance requirements for various designs options, condition development models are being used to forecast condition and cost requirements during the roads lifecycle. The LTPP database has also been used to help calibrate models for conditions such as rutting, cracking and durability. It has also helped to validate condition development and the need for maintenance action.

  • 14.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med december 20152016Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for use in the development of performance prediction models. Monitoring of the LTPP sections (100 m long) started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but, in 2015, the number has increased to 690 sections distributed over 65 sites. All sections are included in Sweden’s national road network. The following activities are included in the monitoring programme: • Distress surveys. Annual surveys are carried out by walking over the sections. During the survey all distresses and surface defects are recorded. The grading of the distresses and defects are based on a national distress manual. • Calculation of an annual crack index. The index is calculated from the type of crack, crack distress grade and crack propagation and is included, in table form, in the database. • Road surface monitoring. Financial restrictions limit the monitoring to every second year. However, rut development and longitudinal unevenness follow a relatively linear trend, so monitoring every second year is considered acceptable in this case. • Measurement of the bearing capacity (KUAB-FWD). The capacity is measured on all new sections and after any maintenance measures. • Cross section profiling is no longer carried out. • Collection of climate data from SMHIs automatic weather observation stations. • Collection of traffic data normally every fourth year. • Quality control check of all collected data before being entered into the LTPP-2015 data base.

  • 15.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Tillståndsuppföljning av observationssträckor: lägesrapport för LTPP-projektet till och med december 20162017Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for use in the development of performance prediction models. Monitoring of the LTPP sections (100 m long) started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections but, in 2016, the number has increased to 690 sections distributed over 65 sites. All sections are included in Sweden’s national road network. During the year, some sections became redundant and a number of replacement sections were included. Budget restrictions in 2000 resulted in a review of the sections and a 25 percent reduction in monitoring was implemented. Despite this decrease, the project purpose could still be maintained. By retaining the most strategically important routes and reducing the number of surveys useful high quality data could still be obtained from the sections left in the monitoring program. In addition, the introduction of median barriers on some sections (to facilitate traffic separation) has meant a disqualification of suitability. During 2017, 313 sections distributed over 33 sites will remain active.

  • 16.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Uppföljning av vägars tekniska tillstånd: lägesrapport för observationssträckor ingående i det svenska LTPP-projektet till och med december 20182019Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for use in the development of performance prediction models. Monitoring of the LTPP (Long Term Pavement Performance) sections (100-metre-long) started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections and have in 2018 increased to 698 sections distributed over 66 sites. All sections are part of the Swedish national road network. During the years, some sections have become redundant and therefore a number of replacement sections are included. Budget restrictions in 2000 resulted in a review of the sections and a 25 percent reduction in monitoring was implemented. Despite this decrease, the project purpose could still be maintained. By retaining the most strategically important routes and reducing the number of surveys useful high-quality data could still be obtained from the sections left in the monitoring program. In addition, the introduction of median barriers on some sections (to facilitate traffic separation) has meant a disqualification of suitability. At the start of 2019, 297 sections distributed over 33 sites will remain active.

    The following activities are included in the monitoring programme:

    Distress surveys. Annual surveys are carried out by walking over the sections. During the survey all distresses and surface defects are recorded. The grading of the distresses and defects are based on a national distress manual.

    • Calculation of an annual crack index. The index is calculated from the type of crack, crack distress grade and crack propagation and is included, in table form, in the database.

    Road surface monitoring. Financial restrictions limit the monitoring to every second year. However, the development of rut and longitudinal unevenness follow a relatively linear trend, so monitoring every second year is considered acceptable in this case.

    • Measurement of the bearing capacity (KUAB-FWD). The capacity is measured on all new sections and after any maintenance measures.

    Cross section profiling (PRIMAL-profiling) is no longer carried out.

    • Collection of climate data from SMHIs automatic weather observation stations.

    • Collection of traffic data normally every fourth year.

    • Quality control check of all collected data before being entered into the LTPP-2018 data base (Microsoft Access 2007–2016).

  • 17.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Uppföljning av vägars tekniska tillstånd: lägesrapport för observationssträckor ingående i LTPP-projektet till och med december 20172018Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for use in the development of performance prediction models. Monitoring of the LTPP (Long Term Pavement Performance) sections (100-metre-long) started in 1984 on commission of the Swedish Road Administration. The aim is primarily to focus on road deterioration caused by heavy traffic. The project started with a limited amount of sections and have in 2017 increased to 690 sections distributed over 65 sites. All sections are part of the Swedish national road network. During the years, some sections have become redundant and therefore a number of replacement sections are included. Budget restrictions in 2000 resulted in a review of the sections and a 25 percent reduction in monitoring was implemented. Despite this decrease, the project purpose could still be maintained. By retaining the most strategically important routes and reducing the number of surveys useful high-quality data could still be obtained from the sections left in the monitoring program. In addition, the introduction of median barriers on some sections (to facilitate traffic separation) has meant a disqualification of suitability. At the start of 2018, 289 sections distributed over 32 sites will remain active.

    The following activities are included in the monitoring programme:

    Distress surveys. Annual surveys are carried out by walking over the sections. During the survey all distresses and surface defects are recorded. The grading of the distresses and defects are based on a national distress manual.

    • Calculation of an annual crack index. The index is calculated from the type of crack, crack distress grade and crack propagation and is included, in table form, in the database.

    Road surface monitoring. Financial restrictions limit the monitoring to every second year. However, the development of rut and longitudinal unevenness follow a relatively linear trend, so monitoring every second year is considered acceptable in this case.

    • Measurement of the bearing capacity (KUAB-FWD). The capacity is measured on all new sections and after any maintenance measures.

    Cross section profiling (PRIMAL-profiling) is no longer carried out.

    • Collection of climate data from SMHIs automatic weather observation stations.

    • Collection of traffic data normally every fourth year.

    • Quality control check of all collected data before being entered into the LTPP-2017 data base (Microsoft Access 2007 - 2016).

  • 18.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Utlåtande, Fog Seal på Y1: uppföljning av provsträckor med ytbehandling som förseglats med Fog Seal2009Report (Other academic)
    Abstract [sv]

    Syftet är att, på uppdrag av Trafikverket, studera konceptet Fog Seal som innebär att ett emulsionsklister (Fog Seal) sprids på en relativt nylagd ytbehandling (inom ett dygn). Tekniken är tänkt att begränsa risken för stenskott och blödningar eftersom vidhäftningen till underlaget förväntas öka och det ingående bindemedlet i klistret är av hård typ. Dessutom kan momentet avsandning uteslutas. Den uppföljande studien indelas i: a) mätning med vägytemätbil, VTI laser RST, med fokus på spårdjup, IRI respektive makrotextur; b) mätning med VTI Saab Friction Tester, med avseende på våtfriktion; och c) bedömning okulärt med avseende på eventuella defekter.

  • 19.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Utlåtande: försök med Y1 Ytbehandlingar. Försök med modifierade emulsioner och långa fraktioner: Fortsättning 2006-2011Report (Other academic)
    Abstract [sv]

    Ett provvägsförsök utfördes på riksväg 84, mellan Kasteln och Laforsen i Gävleborgs län år 2001. Enligt resultaten har tidpunkten för utförandet en mycket stor inverkan på kvalitet och hållbarhet för ytbehandlingar. Samtliga tidigt utförda sträckor klarar påfrestningar från framförallt isrivning, men också från dubbdäckstrafik mycket bra. Även jämnheten visar sig vara bättre än för de senare på året utförda sträckorna. Den tunga trafiken har en stor inverkan på vägbanans makrotextur (ballastens inbäddning i underlaget), spårbildning och jämnhet. Skillnaden är dessutom betydande mellan de två körriktningarna beroende på att timmerbilar går fullastade i en riktning respektive olastade tillbaka, populärt kallat ”timmerränna”. När det gäller ytbehandlingar med längre fraktioner än normalt, för att på så sätt utnyttja ballasten från täkterna effektivare, är det av stor vikt att spridningen sker så att partiklarna skyddar varandra (skuldra mot skuldra) mot mekaniska påkänningar. De två provvägarna mäts årligen med VTI:s vägytemätbil med fokus på makrotextur, spårbildning och ojämnhet. Skadeutveckling dokumenteras genom årlig okulär tillståndsbedömning, besiktning. För mer ingående detaljer om provvägens utförande m.m. hänvisas till VTI notat 14-2007, författat av Torbjörn Jacobson.

  • 20.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Vad har vi lärt oss av de senaste årens FoU?2014Conference paper (Other academic)
  • 21.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Validering av PMS Objekt: delmoment för förstärkning2005Report (Other academic)
    Abstract [sv]

    Genom att nyttja, av VTI, insamlad data för ett stort antal vägsträckor

    (LTPP) har

    Vägverkets dimensioneringsprogram PMS Objekt, delmoment för förstärkning,

    validerats. Detta har möjliggjorts genom jämförelse av den förväntade

    livslängden

    som beräknats av PMS Objekt gentemot den faktiska. I det här sammanhanget

    definieras livslängd som när en viss nivå av skador, beskrivet med hjälp av

    ett

    framräknat sprickindex eller bedömd skadegrad uppnåtts.

  • 22.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Validering av PMS Objekt: delmoment för nybyggnation2004Report (Other academic)
    Abstract [sv]

    Dimensionering enligt ATB VÄG 2003 kan utföras med hjälp av PMS Objekt, ett

    beräkningshjälpmedel för dimensionering av vägars bärighet, vid nybyggnad

    eller förstärkning/underhåll. Även analys av en vägs tjällyftning innefattas.

    Sedan mitten av 80-talet finansierar Vägverket VTI:s uppföljning av

    observationssträckor (LTPP). Dessa är utvalda från normenligt byggda objekt,

    ingående i det statliga belagda vägnätet. Inriktningen är i första hand

    fokuserad på nedbrytningen som orsakas av tung trafik. En databas byggs upp

    innehållande en mängd data som beskriver en vägs tillstånd och vad den

    utsätts för, från nybyggd och framåt i tiden. Det faktum att flera objekt

    följts sedan ursprungskonstruktionen varit oskadad och sedermera utvecklat

    tillväxt av bärighetsbetingade sprickor ligger till grund för hypotesen att

    lämpligheten för validering av PMS Objekts delmoment för nybyggnation med

    hjälp av beräknade sprickindex (Si) bör vara mycket stor. Dock med

    reservation för att de uppföljda vägarna är byggda efter dåtidens krav och

    specifikationer.Ett flertal objekt har åtgärdats medan uppföljningen pågått

    och sprickor har åter uppstått efter en tids trafikering. Detta möjliggör

    även validering av delmoment förstärkning (fortsatt forskning).

  • 23.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Hudson, W Ronald
    University of Texas Austin.
    Jämsä, Heikki
    VTT.
    Spoof, Harri
    VTT.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Development of deterioration models for cold climate using long-term pavement field data1997Report (Other academic)
  • 24.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Hultqvist, Bengt-Åke
    Swedish National Road and Transport Research Institute.
    Provning av mekaniska egenskaper hos marshallprovkroppar: Resilientmodul, drag- och utmattningshållfasthet för provkroppar med olika massasammansättning1987Report (Other academic)
  • 25.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Jacobson, Torbjörn
    Trafikverket.
    Stålslagg i asfaltbeläggning: fältförsök 2005 – 20122013Report (Other academic)
    Abstract [en]

    During the manufacturing process of steel, lime and dolomite are added as fluxes. These then combine with some of the melted impurities and form a slag byproduct. In many countries steel slag is used in both bound and unbound road construction layers. This report discusses the use of the byproduct from the steel mill in Smedjebacken, EAF (Electric Arc Furnace) slag, as an asphalt aggregate. Good experiences with such a material can be found in Halmstad and Laholm, where EAF slag has been used in surface courses on high traffic volume roads since the beginning of the 1990s. In Denmark, EAF slag from Smedjebacken is frequently used in roundabout construction and on roads with intensive traffic. The slag from Smedjebacken has good mechanical properties. The aggregate, after crushing in several steps, has a cubic form but still retains a rough surface texture due to its porous nature. This results in a very stable asphalt road surface. The slag contains a suitable amount of free lime (<0.5%), so resistance against water permeability is very good. To help eliminate any risk of swelling, aggregate is stored outdoors for about a year. The slag from Smedjebacken has good volumetric stability. Metal content is separated off before the slag is crushed and graded into appropriate aggregate fractions. Aggregate size greater than 4 mm is normally used for asphalt surfacing materials. The slags high density (high content of iron oxide) and surface porosity must be carefully considered during the design of the surfacing material. Slag asphalt binder content is lower than conventional asphalt. A number of test sections, where steel slag was used as a surface course, ABS11 (SMA) aggregate, were constructed in Dalarna between 2005 and 2008. At Smedjebacken (2005) and Borlänge (2006), slag asphalt was used in roundabout construction. On Road 68, north of Horndal (2007), a 300 metre long test section was constructed. A larger project using steel slag, ABS11, was carried out on Road 50 between Grängesberg and Ludvika (2008). In this project, the asphalt mix contained 20 per cent porphyry aggregate. To reduce traffic noise emissions, steel slag asphalt (Swedrain8) was used in Skälbyvägen, Järfälla (2010,) and in a test section with drainage asphalt (ABD11 - upper layer in a double drain construction) on the E4, Husqvarna (2010). Another section, constructed with an ABT16 (dense-graded asphalt concrete) containing slag in all fraction sizes, has been tested on a mine access road, with a high volume of heavy traffic, at Garpenberg (2011). Many of the test sections are subjected to high traffic volumes or have high proportions of heavy vehicles. Test sections have been visually inspected for defects each year. On a few occasions, macro texture, rut depth and evenness have also been investigated. Laboratory test results, traffic data, and road information are also presented in the report. In summary, the inspections have shown that the slag asphalt has performed very well. Investigations of the asphalt mix and road surface have shown very good results in terms of stability, stiffness and durability. This makes the material particularly suitable for vulnerable areas. Even durability is deemed acceptable for Swedish winter conditions which involve the use of studded tyres. No defects, such as stone loss, cracking or other surface type defects were observed during the inspection surveys. The slag asphalt, as expected, provided good friction values. Noise reduction levels, for dense or semi-dense asphalt were about 1 dB lower when compared with similar sections with conventional asphalt surfacing.

  • 26.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Viman, Leif
    Swedish National Road and Transport Research Institute, Infrastructure, Pavement Technology.
    Eriksson, Olle
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Avnötningsbeständighet för högkvalitativa slitlagerbeläggningar: slitagemätningar i VTI:s provvägsmaskin (PVM) och jämförelser med laboratorietester enligt Prall2018Report (Other academic)
    Abstract [en]

    Samples from high-quality wearing course asphalt mixes were collected during production in the seasons 2009-2013. The samples included modified asphalts as well as reference mixes. Three different surface wear tests, with respect to abrasion from studded tyres, were carried out using VTIs circular road simulator (PVM). In order to verify the correlation between the three different test modes, tests according to EN 12697-16, Prall method, have been carried out.

    Each of the tests included 14 mix types, including a reference mix, distributed over 28 test plates. The test plates were constructed in a laboratory environment. Extra plates were also constructed for laboratory testing. In total, 42 plates were required per test. Standard plates for PVM testing were used and had a thickness of about 40 millimetres.

    Each test used tyres that had been “run-in” for about 500 kilometres. Sixteen tyres (including 4 reserve) were required for the test runs. Tyres were purchased at the same time from the same manufacturer and divided up randomly.

    Testing was carried out until a constant linear rate of surface wear was achieved. The minimum and maximum number of machine revolutions were set at 200 000 and 300 000 respectively. Surface wear measurements were made by a laser profilometer and were taken at regular intervals on all 28 sample plates.

  • 27.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Dimensionering vid förbättring och underhåll: datainsamling1998Report (Other academic)
  • 28.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Dimensionering vid förbättring och underhåll: Datainsamling. Lägesrapport 1993-121994Report (Other academic)
  • 29.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Dimensionering vid förbättring och underhåll: Datainsamling. Lägesrapport 1994-121995Report (Other academic)
  • 30.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Dimensionering vid förbättring och underhåll: datainsamling. Lägesrapport 1996-021996Report (Other academic)
  • 31.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Dimensionering vid förbättring och underhåll: datainsamling. Lägesrapport 1997-011997Report (Other academic)
  • 32.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 1999-021999Report (Other academic)
  • 33.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2000-022000Report (Other academic)
  • 34.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2001-022001Report (Other academic)
  • 35.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2002-022002Report (Other academic)
  • 36.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2002-122003Report (Other academic)
    Abstract [sv]

    Målsättningen med projektet är att samla in, bearbeta och leverera högkvalitativa data, primärt till utveckling av tillståndsförändringsmodeller. Uppföljningen av observationssträckor (100 meter långa) har, på uppdrag av Vägverket, pågått sedan 1984. Inriktningen är i första hand fokuserad på nedbrytningen som orsakas av tung trafik. De första åren utfördes mätningar på ett begränsat antal sträckor. Antalet har sedan, efterhand som projektet fortskridit, utökats och uppgick vid utgången av år 1999 till 621 stycken fördelade över 62 olika objekt, ingående i det statliga belagda vägnätet. I början av år 2001 gjordes en översyn av samtliga sträckor och antalet, som fortsättningsvis skulle bevakas, minskades radikalt till 372 fördelade på 36 objekt. Förändringarna gjordes dock på sådant sätt att högkvalitativa och användbara data fortfarande erhålls från de sträckor som är kvar i uppföljningsprogrammet.

  • 37.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2003-122004Report (Other academic)
    Abstract [sv]

    Sedan 1984 pågår vid VTI projektverksamhet med målsättningen att samla in,

    bearbeta och leverera högkvalitativa data till utveckling av

    tillståndsförändringsmodeller för belagda vägar. Med hjälp av denna typ av

    modeller skall man kunna förutsäga tillståndets förändring i tiden samt kunna

    bestämma den lämpligaste underhållsåtgärden och lämpligaste tidpunkten för

    densamma. Stommen i modellerna förväntas bestå av data som beskriver vägens

    aktuella tillstånd, dess styrka alternativt nominella uppbyggnad,

    trafikbelastning samt rådande klimat. Detta innebär att en databas byggs upp

    innehållande en mängd data som beskriver en vägs tillstånd från nybyggd fram

    till dagsläget. I föreliggande notat, lägesrapport, beskrivs i första hand

    insamlingen av nya data som skett under år 2003.

  • 38.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: Datainsamling, lägesrapport 2004-122005Report (Other academic)
    Abstract [sv]

    Målsättningen med projektet är att samla in, bearbeta och leverera

    högkvalitativa

    data, primärt till utveckling av tillståndsförändringsmodeller. Uppföljningen

    av

    observationssträckor (100 meter långa) har, på uppdrag av Vägverket (VV),

    pågått sedan 1984. Inriktningen är i första hand fokuserad på nedbrytningen

    som

    orsakas av tung trafik.

  • 39.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2005-122006Report (Other academic)
    Abstract [sv]

    Målsättningen med projektet är att samla in, bearbeta och leverera högkvalitativa data, primärt till utveckling av tillståndsförändringsmodeller. Uppföljningen av observationssträckor (100 meter långa) har, på uppdrag av Vägverket, pågått sedan 1984. Inriktningen är i första hand fokuserad på nedbrytningen som orsakas av tung trafik. De första åren utfördes mätningar på ett begränsat antal sträckor. Antalet har sedan, efterhand som projektet fortskridit, utökats och uppgick vid utgången av år 2005 till 655 stycken fördelade över 66 olika objekt, ingående i det statliga belagda vägnätet. Under årens lopp har antalet bevakade sträckor ändrats så till vida att några utgått och andra tillkommit. En översyn av samtliga sträckor gjordes i början av år 2000. Antalet som fortsättningsvis skulle bevakas, minskades med en fjärdedel. Förändringarna gjordes dock på sådant sätt att högkvalitativa och användbara data fortfarande erhålls från de sträckor som är kvar i uppföljningsprogrammet. Idag är 359 aktiva, fördelade över 36 objekt.

  • 40.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2006-122007Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    The objective of this project is to collect and deliver high quality road data primarily for development of performance prediction models. The monitoring of LTPP-sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily focused on road deterioration caused by heavy traffic. The project started with a limited amount of sections but the number of sections has increased to 655 sections distributed over 66 sites, still active and inactive, in year 2006. Of budget reasons an overview resulted in a decrease of monitoring sections with 25 %. In the year 2006 there were still 359 active LTPP-sections distributed over 36 sites. Road data from this project has been used for developing models for predicting the cumulative number of load applications to the initiation of cracking for flexible pavements and to develop models for predicting crack propagation in flexible pavements. Crack initiation was defined as the first appearance of cracking in the wheel paths.

  • 41.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Tillståndsuppföljning av observationssträckor: datainsamling, lägesrapport 2007-122008Report (Other academic)
    Abstract [en]

    The objective of this project is to collect and deliver high quality road data primarily for development of performance prediction models. The monitoring of LTPP-sections started in 1984 on commission of the Swedish Road Administration. The aim is primarily focused on road deterioration caused by heavy traffic. The project started with a limited amount of sections but the number of sections has increased to 655 sections distributed over 66 sites, still active and inactive, in year 2007. Of budget reasons an overview resulted in a decrease of monitoring sections with 25 %. In the year 2007 there were still 345 active LTPP-sections distributed over 36 sites. Road data from this project has been used for developing models for predicting the cumulative number of load applications to the initiation of cracking for flexible pavements and to develop models for predicting crack propagation in flexible pavements. Crack initiation was defined as the first appearance of cracking in the wheel paths.

  • 42.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Överbyggnadsåtgärder - datainsamling: Lägesrapport 1992-121992Report (Other academic)
  • 43.
    Göransson, Nils-Gunnar
    et al.
    Swedish National Road and Transport Research Institute.
    Wågberg, Lars-Göran
    Swedish National Road and Transport Research Institute.
    Överbyggnadsåtgärder: Datainsamling. Lägesrapport 1991-121992Report (Other academic)
  • 44. Jacobson, Torbjörn
    et al.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Indränkt Makadam Tät (IMT): provvägsförsök och kontrollsträckor, lägesrapport 2007-20102010Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    På senare år har intresset för indränkt makadam ökat markant. Mer än 2 miljoner kvadratmeter IMT (indränkt makadam tät – eng. ”dense grouted macadam”) läggs årligen som ett kombinerat slit- och bärlager på låg- till medeltrafikerade vägar. Erfarenheterna är hittills mycket positiva enligt uppföljningar utförda av VTI. Ett flertal prov- och kontrollsträckor som ligger i Småland och Östergötland, ingår i uppföljningen.

  • 45.
    Jacobson, Torbjörn
    et al.
    Swedish National Road and Transport Research Institute.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Slitlager med polymermodifierat bindemedel: Provväg E3/E18, Örebro-Arboga. Lägesrapport 89.101989Report (Other academic)
  • 46.
    Jansson, Håkan
    et al.
    Swedish National Road and Transport Research Institute.
    Djärf, Lennart
    Swedish National Road and Transport Research Institute.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute.
    Effekt av olika förstärkningsåtgärder på asfaltbelagda vägar: delrapport 11998Report (Other academic)
  • 47.
    Lundberg, Thomas
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Ekblad, Jonas
    NCC Roads.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Sjögren, Leif
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Arvidsson, Anna K.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Makrotexturens möjlighet att identifiera låg friktion: tillståndsmätning av vägytan2015Report (Other academic)
    Abstract [en]

    The Swedish Transport Administration want to describe the friction condition of the entire national road network. A nationwide friction measurement is practically difficult to manage and very costly, while we are already measuring road surface macrotexture. In this project, we test whether the macro texture (MPD, Mean Profile Depth) can be used to describe the friction condition of the road network. We have not been able to show this correlation but we present other interesting findings that give a piece of the puzzle for the Swedish Transport Administration how they can and should deal with the friction issue. We see, among other things, that the risk of low friction is greater on road sections with low MPD values and especially on roads with surface dressing that has bleeding patches. Furthermore, we describe the friction risks involved with different coatings and how these might be handled.

  • 48.
    Lundberg, Thomas
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Glantz, Christian
    Ramböll.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Kontroll och uppföljning av entreprenader - del 1, dagens krav och metoder: Vägytemätning med mätbil2019Report (Other academic)
    Abstract [en]

    The Swedish Transport Administration aims to increase the number of design build contracts. To get a functioning control device around the contracts, well defined requirements must be set for the warranty period of the road. In this survey we focus on functional requirements that are set for design build contracts and which can be checked by means of a road surface testing. The report highlights what requirements are used and how they are checked, but it also takes up subjectively assessed requirements that should be replaced by an objective method.

    Furthermore, important aspects of the implementation of a contract are described. The contact between the measuring supplier and the contractor is extremely important for determining when, how and where the controls are to be performed. A total contract often contains several roads, ramps and so forth, which requires its special planning and control routines.

    A review is made of defects that can occur on design build contracts and at what stage they occur (construction stage/use stage). For many of the defects identified there is no established objective measurement method. Therefore, usable methods need to be further developed and verified.

    Another important aspect of design build contract is how the requirements are set and followed up. Clear guidelines for the requirement setting should be worked out where it is decided which consideration should be taken, for example, for traffic volume, studded tires, signed speed and climate.

  • 49.
    Möller, Staffan
    et al.
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Göransson, Nils-Gunnar
    Swedish National Road and Transport Research Institute, Infrastructure, Infrastructure maintenance.
    Hala däck vid virkestransporter2010Report (Other academic)
    Abstract [en]

    For many years now, road authorities and representatives from the tyre industry have been well aware of the problems associated with tyre grip loss. The loss of grip is described as the tyres had developed some kind of film or coating. Representatives from the tyre industry believe that a likely explanation is that the coating on the tyre is formed from an asphalt residue found in the water on a wet road surface. The residue is made up of road surface particles worn away by, among others, studded tyres. Chemical analysis, carried out in the 1980s, showed that the coating consists of asphalt, various forms of petroleum products, exhaust residue and salt. The problem occurs only in connection with salted roads. The project has covered the following points:

    • Analysis of a survey, sent out to circa 200 hauliers who work in the timber transport industry
    • A more recent chemical analysis of the coating deposited on tyres with grip loss
    • Collection and compilation of data contained in journals of drivers who work with timber transport in Northern Sweden

    Drivers recorded among other things weather, road conditions, traction, and tyre feel. The journal data was supplemented by details of any maintenance measures taken by road managers. The data has been analysed in order to find a trigger pattern for the loss of tyre grip.

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