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Sulejmani, P., Said, S. F., Agardh, S. & Ahmed, A. W. (2019). Moisture Sensitivity of Asphalt Mixtures using Cycling Pore Pressure Conditioning. Transportation Research Record
Open this publication in new window or tab >>Moisture Sensitivity of Asphalt Mixtures using Cycling Pore Pressure Conditioning
2019 (English)In: Transportation Research Record, ISSN 0361-1981, E-ISSN 2169-4052Article in journal (Refereed) Published
Abstract [en]

One of the major causes of premature failure in asphalt pavements is moisture damage. Asphalt mixtures designed without considering climate impacts may suffer from durability problems caused by movement of water inside the asphalt mixture. Rolling traffic over wet pavement builds up pore pressure in the mixture, which will consequently accelerate deterioration. The objective of the study was to assess the moisture damage to asphalt concrete mixtures by means of complex modulus testing of dry and moisture-conditioned asphalt specimens with various mixture compositions. The asphalt mixtures were conditioned with the Moisture Induced Sensitivity Tester (MIST), which aims to replicate pore pressure in field conditions. The results showed a decline in stiffness modulus and a reduction in elastic properties after MIST conditioning. In addition, the results indicated that binder content and air void content had a significant influence on the reduction in stiffness. To capture the relationship between air void content, binder content, and the reduction in stiffness, a relationship was developed and validated with measurements on cores extracted in the field.

Keywords
Moisture, Damage, Flexible pavement, Porosity, Laboratory (not an organization), Pore water pressure, Modulus of elasticity, Binder content
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 32 Road: Pavement design
Identifiers
urn:nbn:se:vti:diva-13459 (URN)10.1177/0361198118823496 (DOI)2-s2.0-85060931057 (Scopus ID)
Available from: 2019-01-23 Created: 2019-01-23 Last updated: 2019-05-03Bibliographically approved
Lindelöf, P., Said, S. F. & Ahmed, A. W. (2019). Poisson’s Ratio of Asphalt Concrete Mixes Using Indirect Tensile Test. Journal of Testing and Evaluation, 47(1)
Open this publication in new window or tab >>Poisson’s Ratio of Asphalt Concrete Mixes Using Indirect Tensile Test
2019 (English)In: Journal of Testing and Evaluation, ISSN 0090-3973, E-ISSN 1945-7553, Vol. 47, no 1Article in journal (Refereed) Published
Abstract [en]

Increased interest in mechanistic evaluation of flexible pavement structures has brought a demand for accurate and practical methods, models, or both to estimate the mechanical properties of asphalt concrete mixtures. One of these properties is the Poisson’s ratio (ν) of asphalt concrete mixtures, which is often assumed to have a constant value of 0.35 in asphalt concrete evaluations. However, investigations have reported that mixture type, air void content, and temperature produce considerable variation in measured ν-values that could have a significant effect on evaluations of asphalt concrete mixes. The objective of this study was to evaluate the effect of air voids, binder type, and testing conditions on the measured ν-values. Indirect tensile (IDT) tests were conducted to measure ν-values. The study indicated that the Poisson’s ratio of the asphalt concrete mixes, on average, attained a maximum value at a particular level of air void content. Furthermore, when comparing the Poisson’s ratio values in relation to the dynamic modulus, calculated using the Mechanistic Empirical Pavement Design Guide (MEPDG) equation, higher ν-values were attained. This demonstrates the importance of measuring the Poisson’s ratio of a mix type.

Keywords
Flexible pavement, Bituminous mixture, Poisson's ratio, Voids, Porosity, Temperature
National Category
Infrastructure Engineering
Research subject
50 Road: Materials, 51 Road: Bituminous materials and binders
Identifiers
urn:nbn:se:vti:diva-13182 (URN)10.1520/JTE20170516 (DOI)
Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2018-11-19Bibliographically approved
Said, S. F., Lundberg, T., Rahman, S., Carlsson, H., McGarvey, T., Ahmed, A. & Enocksson, C.-G. (2019). Utförandets inverkan på hållbarhet för beläggningslager. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Utförandets inverkan på hållbarhet för beläggningslager
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2019 (Swedish)Report (Other academic)
Alternative title[en]
The impact of quality of work execution on asphalt concrete durability
Abstract [sv]

Utförandet av en vägbeläggning har stor betydelse för hållbarheten. Separation i massabeläggningar leder till kortare livslängd på asfaltbeläggningar och för tidigt uppkomna skador har ofta ett direkt samband med hur väl utfört beläggningsarbetet är. Svårigheten med separationsproblemet ligger i att det saknas lätthanterliga och objektiva praktiska metoder för bestämning av separationsgrad och dess effekt på hållbarheten. Under senare år har vägytemätbilar använts för mätning av makrotextur med måttet MPD (Mean Profile Depth). Korrelationen mellan MPD-värden och styvhetsmodul antyder att MPD-mätvärden skulle kunna vara en praktisk och snabb metod för utvärdering av kvaliteten hos utfört arbete. Ett begränsat antal fallviktsmätningar utfördes på positioner med olika separationsgrad i AG-lagret (Asfaltbundet Grus). Det konstaterades en tendens till inverkan av separation i AG-lagret på fallviktsdata även om det fanns en variation i data. I denna studie presenteras ett tillvägagångssätt för detektering av ytor med hög makrostruktur. Fast MPD-värden bara beskriver ytans textur, kan det användas för en snabb skanning av separerade ytor i det översta beläggningslagret. Begränsad och riktad provtagning kan därefter utvärderas för mer exakt bestämning av separationsgrad och dess effekt på livslängden/ hållbarheten.

Abstract [en]

Non-destructive testing in quantifying the asphalt pavement layers homogeneity can be used for the quality assurance in paving contracts. This paper summarizes the findings from a field study on segregation in bituminous pavement mixes that relates pavement layer surface texture to the homogeneity of the paved bituminous layer by distinguishing mix segregated area. The mean profile depth (MPD) values of paved layer were measured. Based on these values three locations on the road were identified having low, intermediate and high MPD values. Thereafter, cored samples were tested for stiffness modulus before and after moisture conditioning by performing the moisture induced sensitivity test (MIST). Results clearly showed that the samples from the locations with high MPD values were mostly affected by the moisture conditioning for which the stiffness moduli were significantly reduced. The samples with high MPD values had the highest air voids as well. Thus, this study demonstrated that construction quality described by segregation in the paved asphalt mix has a significant impact on the moisture sensitive performance of pavements. A limited number of falling weight deflectometer (FWD) measurements were performed at positions with different degree of separation in the road base layer. There was a tendency for the effect of separation in the road base layer on FWD even though there was a variation in data. The strong correlation between the MPD values and change in stiffness modulus also suggests that the measurements of the MPD values can be a reliable and non-destructive method for evaluating the construction quality of a pavement and in developing the quality assurance criteria based on pavement performance that can be used in paving contracts.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2019. p. 27
Series
VTI rapport, ISSN 0347-6030 ; 998
Keywords
Surfacing, Bituminous mixture, Segregation (mater), Lifetime, Durability, Surface texture, Falling weight deflectometer, Performance
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 33 Road: Surfacing; 30 Road: Highway design, 33 Road: Surfacing
Identifiers
urn:nbn:se:vti:diva-13701 (URN)
Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-06-11Bibliographically approved
Jelagin, D., Ahmed, A. W., Lu, X. & Said, S. F. (2018). Asphalt layer rutting performance prediction tools. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Asphalt layer rutting performance prediction tools
2018 (English)Report (Other academic)
Alternative title[sv]
Asfaltbeläggningars spårtillväxt prognostiseringsverktyg
Abstract [en]

Flexible pavement rutting due to permanent deformation accumulation in asphalt layers is one of the most common modes of road failures. In addition to creating high maintenance costs, rutting is a major concern for traffic safety, as the rut development increases the risk of hydroplaning and introduce difficulties in vehicle steering. In this context, accurate methodologies for pavement rutting performance prediction are crucial for decision support in pavement design and rehabilitation. In particular, better rutting performance models are needed to evaluate, new asphalt materials as well as to evaluate the impact of different vehicle types on roads’ service life.

The main goal of this report is to present a summary of the existing asphalt rutting performance prediction tools. The present review is limited to available and/or frequently referred to tests and models with an established link to field rutting performance. Accordingly, models focusing solely on permanent deformation on the material level are beyond the framework of the present study.

Road structure and its materials, heavy vehicle parameters and climate affecting rutting accumulation in the field are identified. Their significance has been evaluated based on the experimental and numerical findings reported in the literature. Several rutting performance prediction models recently proposed in the literature are summarized along with the material characterization tests used in the models. The reviewed models’ capability to quantify the influence of various structural, material and traffic parameters on the pavement’s rutting performance is examined.

It is concluded that implementation of rutting performance models incorporating experimentally measured viscoelastic and permanent deformation properties of asphalt mixtures is a promising way to improve the accuracy of pavement performance predictions. In particular since they allow the effect of novel materials, e.g. polymer-modified, on the pavement’s rutting performance to be quantified.

Abstract [sv]

Spårbildning i bitumenbundna beläggningar är en av de vanligaste vägskadorna. Utöver de höga underhållskostnaderna orsakar detta ett stort problem för trafiksäkerheten, eftersom risken för vattenplaning ökar och fordonsstyrningen försvåras. Noggranna och praktiska metoder för prediktering av spårutveckling är avgörande för beslutsstöd i dimensionering och rehabilitering av vägar. Bättre spårmodeller behövs också för att utvärdera nya massabeläggningar samt för att kunna utvärdera effekterna av olika fordonstyper på vägarnas livslängd.

Huvudsyftet med denna rapport är att presentera en sammanfattning av de tillgängliga och praktiska modellerna för prognostisering av spårtillväxt i asfaltlager. Den aktuella litteraturstudien är begränsad till tillgängliga och/eller ofta refererade modeller som validerats mot vägars prestanda. Följaktligen ligger modeller som enbart fokuserar på permanent deformation på materialnivå bortom ramen för föreliggande studie.

Vägkonstruktioner och dess material, trafikparametrar och klimatinverkan som påverkar spårbildning i fält har identifierats. Deras betydelse har utvärderats utifrån de experimentella och numeriska rön som rapporterats i litteraturen. Flera modeller som under senare år föreslagits i litteraturen har sammanfattats tillsammans med de materialkarakteriseringstester som används i modellerna. De granskade modellernas förmåga att kvantifiera påverkan av olika konstruktions-, material- och trafikparametrar på spårtillväxt hos vägar utvärderas.

Det konstateras att implementering av spårmodeller som innehåller experimentellt uppmätta viskoelastiska och permanenta deformationsegenskaper för asfaltblandningar, är en lovande metodik att förbättra noggrannheten i prognostisering av vägars spårutveckling. I synnerhet eftersom de tillåter kvantifiering av effekten av nya material, t.ex. polymermodifierad, på vägens motstånd mot spårbildning.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2018. p. 52
Series
VTI rapport, ISSN 0347-6030 ; 968A
Keywords
Rutting (wheel), Bituminous mixture, Surfacing, Performance, Prediction, Model (not math), Viscoelasticity, Elasticity, Shear, Field (test)
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 32 Road: Pavement design
Identifiers
urn:nbn:se:vti:diva-12810 (URN)
Available from: 2018-03-29 Created: 2018-03-29 Last updated: 2019-05-17Bibliographically approved
Porot, L., Soenen, H., Besamusca, J., Apeagyei, A., Grenfell, J., Vansteenkiste, S., . . . Wistuba, M. (2018). Bituminous binder. In: Manfred N. Partl, Laurent Porot, Hervé Di Benedetto, Francesco Canestrari, Paul Marsac, Gabriele Tebaldi (Ed.), Testing and Characterization of Sustainable Innovative Bituminous Materials and Systems: State-of-the-Art Report of the RILEM Technical Committee 237-SIB (pp. 15-74). Springer Netherlands
Open this publication in new window or tab >>Bituminous binder
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2018 (English)In: Testing and Characterization of Sustainable Innovative Bituminous Materials and Systems: State-of-the-Art Report of the RILEM Technical Committee 237-SIB / [ed] Manfred N. Partl, Laurent Porot, Hervé Di Benedetto, Francesco Canestrari, Paul Marsac, Gabriele Tebaldi, Springer Netherlands , 2018, p. 15-74Chapter in book (Refereed)
Abstract [en]

One of the most important aspects of asphalt pavement deterioration is the ingress of water in pavement which leads to loss of the material characteristics, even material integrity with loss of aggregates. Thus the behaviour of asphalt mixture under moisture conditions is one of the key parameter for specifications. It’s a complex phenomenon which is influenced amongst other things by materials properties with wetting, cohesion and adhesion of bituminous binder and by environmental conditions with temperature, moisture, loading and layer type. It has been a research subject for a very long time and still not precisely described. A large number of test methods is available to estimate the affinity between aggregates and bituminous binders. These test methods can be subdivided in different ways; a first distinction can be based on the presence or absence of water during the test procedure. If water is present, the evaluation is in fact referred to as water sensitivity or moisture damage testing. Another distinction can be based on the type of sample that is evaluated. The test sample can be loose aggregates coated with a bituminous binder or a compacted asphalt mix sample. Lastly the individual components, bitumen and aggregate, can be tested separately through intrinsic properties. Furthermore, test results can also be based on the quantification of the test results, whether this is based on a qualitative or a quantitative evaluation. In RILEM TC 237 SIB, TG1 the main purpose was to evaluate common test methods, used to assess the affinity of bitumen to aggregate surfaces, to determine, if possible, the repeatability and reproducibility and to give recommendations for improvement. In this study both binders and aggregates have been considered. Three bituminous binders, two unmodified from different sources, one polymer modified binder, and four aggregate types, with different mineralogy, have been selected. The test methods considered in the study include the rolling bottle test, the boiling water stripping test and the bitumen bond strength test; also surface energy was investigated. This chapter presents the results of these tests and their accuracy.

Place, publisher, year, edition, pages
Springer Netherlands, 2018
Series
RILEM State Art Reports ; 24
Keywords
Bituminous mixture, Moisture, Adhesion, Cohesion, Aggregate, Test method, Evaluation (assessment), Binder
National Category
Infrastructure Engineering
Research subject
50 Road: Materials, 51 Road: Bituminous materials and binders
Identifiers
urn:nbn:se:vti:diva-13565 (URN)10.1007/978-3-319-71023-5_2 (DOI)2-s2.0-85041498925 (Scopus ID)
Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-03-14Bibliographically approved
Ahmed, A. W., Said, S. F., Lu, X. & Carlsson, H. (2018). Pavement performance follow-up and evaluation of polymer-modified test sections. The international journal of pavement engineering, 1-14
Open this publication in new window or tab >>Pavement performance follow-up and evaluation of polymer-modified test sections
2018 (English)In: The international journal of pavement engineering, ISSN 1029-8436, E-ISSN 1477-268X, p. 1-14Article in journal (Refereed) Published
Abstract [en]

Between 2003 and 2006, a test road consisting of several conventional and polymer-modified structures was built on a motorway. Different combinations of styrene–butadiene–styrene (SBS) and ethyl vinyl acetate (EVA) polymer-modified binders were used. The test structures have been in service since then and have been monitored for over 9 years. The resistance of the different types of asphalt concrete mixes to rutting and cracking was measured and predicted. The impact of ageing on the mixes was also evaluated. Although all the sections are in good condition after 9 years of traffic, the predicted differences between the test sections based on the PEDRO (Permanent Deformation of asphalt concrete layers for Roads) approach and laboratory evaluations are noticeable. Lateral wander and transverse profile measurements indicated that studded winter tyre wear contributed to most of the rutting compared to permanent deformation due to heavy traffic. The unmodified mixes exhibited considerable ageing and the SBS-modified mixes were least affected by ageing. Furthermore, the SBS-modified base mix produced significantly better fatigue resistance than the conventional base mix. However, further investigations of the relationships between bitumen and mix properties and further follow-ups of the test sections are recommended to validate the findings.

Place, publisher, year, edition, pages
Taylor and Francis Ltd., 2018
Keywords
Polymer modified bitumen, Experimental road, Motorway, Rutting (wheel), Cracking, Ageing, Fatigue (mater)
National Category
Infrastructure Engineering
Research subject
50 Road: Materials, 51 Road: Bituminous materials and binders
Identifiers
urn:nbn:se:vti:diva-12865 (URN)10.1080/10298436.2018.1435878 (DOI)2-s2.0-85041917655 (Scopus ID)
Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-06-11Bibliographically approved
Said, S. F. & Ahmed, A. W. (2018). Prediction of heavy vehicle impact on rut development using pedro model. In: Bearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017: . Paper presented at 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017, 28 June 2017 through 30 June 2017 (pp. 1359-1366). CRC Press/Balkema
Open this publication in new window or tab >>Prediction of heavy vehicle impact on rut development using pedro model
2018 (English)In: Bearing Capacity of Roads, Railways and Airfields - Proceedings of the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017, CRC Press/Balkema , 2018, p. 1359-1366Conference paper, Published paper (Refereed)
Abstract [en]

Permanent deformation or flow rutting in bituminous layers is a common distress mode in flexible pavements that is exhibited as an excessive deformation of bituminous material in the wheel paths. Rutting gradually increases with repeated loading of heavy vehicles. To predict surface rutting, it is therefore essential to include the influence of heavy vehicle parameters such as the number of passages of wheel loads, axle load configuration (single or dual wheel), tire type, inflation pressure, vehicle speed and lateral wandering of the traffic in addition to variation in mixture properties at ambient temperatures over elapsed time. The linear viscoelastic permanent deformation model for a bituminous layer of roads, PEDRO, has been adopted in this work to analyse the vertical strain distribution in a flexible pavement and prediction of rutting under various combination of heavy vehicle parameters. The effects of heavy vehicles with different axle load configurations are evaluated with support of field measurements over a 14-year period.

Place, publisher, year, edition, pages
CRC Press/Balkema, 2018
Keywords
Flexible pavement, Rutting (wheel), Mathematical model, Viscoelasticity, Analysis (math), Strain, Vertical, Lorry, Characteristics, Axle load, In situ, Measurement
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 32 Road: Pavement design
Identifiers
urn:nbn:se:vti:diva-13543 (URN)10.1201/9781315100333-195 (DOI)2-s2.0-85058547702 (Scopus ID)9781138295957 (ISBN)
Conference
10th International Conference on the Bearing Capacity of Roads, Railways and Airfields, BCRRA 2017, 28 June 2017 through 30 June 2017
Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-03-20Bibliographically approved
Said, S. H. (2016). Asphalt concrete rutting predicted using the PEDRO model. The international journal of pavement engineering, 17(3), 245-252
Open this publication in new window or tab >>Asphalt concrete rutting predicted using the PEDRO model
2016 (English)In: The international journal of pavement engineering, ISSN 1029-8436, E-ISSN 1477-268X, Vol. 17, no 3, p. 245-252Article in journal (Refereed) Published
Abstract [en]

This paper presents a theoretical viscoelastic approach, called PEDRO(PErmanent Deformation of asphalt concrete layers for ROads), for predicting rut formation in asphalt concrete materials subjected to traffic loading. Input data are traffic parameters, asphalt concrete viscosity and asphalt layer thickness. Vertical strains that cause rutting in the pavement were estimated using the PEDRO approach. A large-size type of wheel tracking machine, which has the capability to subject asphalt concrete slabs to different loadings has been used to study the effects of wheel load and tyre pressure. Rut development in the slabs under various loading conditions was predicted. The approach has shown reasonable results as regards predicting densification and shear rutting in tested asphaltconcrete slabs.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2016
Keywords
Rutting, Viscoelasticity, Prediction, Deformation, Surfacing, Thickness, Load, Tyre, Pressure
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 32 Road: Pavement design
Identifiers
urn:nbn:se:vti:diva-7476 (URN)10.1080/10298436.2014.993184 (DOI)000366662200006 ()2-s2.0-84919904267 (Scopus ID)
Available from: 2015-01-14 Created: 2015-01-14 Last updated: 2017-10-31Bibliographically approved
Viman, L., Ahmed, A. W., Said, S. F. & Lind, L. (2016). Evaluation of Slag as aggregates in Asphalt Mixtures. In: Proceedings of 6th Eurasphalt & Eurobitume Congress: . Paper presented at 6th Eurasphalt & Eurobitume Congress 1-3 June 2016. Czech Technical University in Prague
Open this publication in new window or tab >>Evaluation of Slag as aggregates in Asphalt Mixtures
2016 (English)In: Proceedings of 6th Eurasphalt & Eurobitume Congress, Czech Technical University in Prague , 2016Conference paper, Published paper (Refereed)
Abstract [en]

During the last decade, the Swedish Transport Administration together with contractors, Steel industry in Sweden and the Swedish National Road and Transport Research Institute have built test road sections with Steel slag in various locations in Sweden.  Steel slag has well-known good adhesion, durability, wear resistance and noise reducing properties.  This project pointed out the importance for steel slag producers to produce a slag quality that fulfils the requirements as road material, where also particle emission is an important issue. There are over 10 producers of steel slag in Sweden. There are several goals for using steel slag in asphalt mixes; mainly longer technical lifetime caused by good wear resistance against studded tyres, good stability performance in binder and base course, and good durability performance, the latter being especially important in porous asphalt, where it also potentially gives some noise-reducing effects. In addition, the environmental aspects in terms of particle emission, were an important issue for this project.  So far, test sections show good performance according to road surface measurements.  Laboratory test according to European standards for aggregate and several road simulator test for wear resistance and particle emission have been performed during the last five years by means of the unique road simulator at VTI. An important part of the project is to increase the knowledge for the steel slag producers to develop a material that fulfils the requirements for road material in as many aspects as possible, both technical and environmental issues. The results are so far promising, and expectations are met.

Place, publisher, year, edition, pages
Czech Technical University in Prague, 2016
Keywords
Slag, Experimental road, Wear, Surfacing, Measurement, Particulate matter, Roadbase, Performance
National Category
Infrastructure Engineering
Research subject
50 Road: Materials, 56 Road: Aggregate and stone materials; 30 Road: Highway design, 32 Road: Pavement design
Identifiers
urn:nbn:se:vti:diva-13460 (URN)10.14311/EE.2016.238 (DOI)
Conference
6th Eurasphalt & Eurobitume Congress 1-3 June 2016
Available from: 2019-01-23 Created: 2019-01-23 Last updated: 2019-05-03Bibliographically approved
Said, S. F. & Jacobson, T. (2015). Kalltillverkad asfaltbeläggning. Linköping: Statens väg- och transportforskningsinstitut
Open this publication in new window or tab >>Kalltillverkad asfaltbeläggning
2015 (Swedish)Report (Other academic)
Alternative title[en]
Cold asphalt mixture pavements
Abstract [sv]

En kunskapsöversikt över kalltillverkade asfaltbeläggningar både i Sverige och andra länder presenteras i syfte att vidareutveckla kalltekniken som en miljöanpassad asfaltbeläggning. Kall asfaltteknik har periodvis använts i Sverige under många år, dock endast på lågtrafikerade vägar, både i slit- och bärlagermassor. Under senare år har emulsioner baserade på hårdare bitumen tillverkats för tillverkning av asfaltbeläggningar med högre prestanda. I det här arbetet undersöks kalltillverkade asfaltmassor baserade på hårdare bitumen i bärlagren, på mer högtrafikerade vägar där av tradition varmblandad asfalt används. Uppbyggnaden av flera provsträckor och initial tillståndsutvärdering av provsträckor redovisas. Det konstateras från den här begränsade studien att beläggningar med kallteknik är ett effektivt sätt att minska miljöpåverkan genom lägre koldioxidutsläpp och energiåtgång vid tillverkning och utläggning av kallmassan, dock finns det behov av utvecklingsinsatser för en systematisk användning av kalltillverkad asfalt med bra funktionsegenskaper på högtrafikerade vägar.

Abstract [en]

An overview of current knowledge concerning cold asphalt pavements in Sweden and other countries is presented to form a basis for further development of the cold mixing technique as an environmentally adapted asphalt pavement. The cold mixing technique has been used periodically in Sweden for a number of years, but only on roads with little traffic, in both wearing and road base courses. In recent years, emulsions based on harder bitumen have been used to manufacture asphalt pavements with higher performance. This study investigates cold mixed asphalt concrete based on harder bitumen in the road base layer on roads with heavy traffic where hot mixed asphalt has traditionally been used. The construction of several test sections and initial condition evaluations of the test sections are presented. It was found in this limited study that cold mixed pavements are an effective way to reduce environmental impact through lower carbon dioxide emissions and energy consumption during the manufacture and laying of the cold compound. Development is however needed in order to achieve systematic use of cold mixed asphalt with good function characteristics on roads with heavy traffic.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2015. p. 42
Series
VTI rapport, ISSN 0347-6030 ; 865
Keywords
Surfacing, Roadbase, Cold coated material, Experimental road, Condition survey, Impact study (environment), Carbon dioxide, Energy consumption, Manufacture, Laying, Mixing plant
National Category
Infrastructure Engineering
Research subject
50 Road: Materials, 51 Road: Bituminous materials and binders; 30 Road: Highway design, 33 Road: Surfacing
Identifiers
urn:nbn:se:vti:diva-7985 (URN)
Available from: 2015-08-25 Created: 2015-08-25 Last updated: 2016-02-04Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6308-7487

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