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  • 1.
    Arvidsson, Håkan
    et al.
    Swedish National Road and Transport Research Institute.
    Loorents, Karl-Johan
    Swedish National Road and Transport Research Institute.
    Inverkan av köld och vatten på glimmerhaltiga bärlager2008Report (Other academic)
    Abstract [en]

    Controlled conditions offer a possibility to determine the influence of free mica grains in an unbound base layer during simulated frost heave and thaw cycling. By ensuring a similar grain size distribution between sample materials, and that the test samples have been soaked in water and later drained in a similar manner, followed by a well designed freeze-thaw cycling, a plain correlation between the amount of free mica grains in the unbound sub base materials of crushed rock aggregates and frost heave action (in particular noticeable in the residual heave) can be provided.

  • 2.
    Loorents, Karl-Johan
    Swedish National Road and Transport Research Institute.
    Bergmaterial i väglinjen: delrapport2006Report (Other academic)
    Abstract [sv]

    The Swedish Road Administration's planning process for road building spans from strategic proposal over surveying to the ready road. Geotechnique and material supply are two areas that may have a significant influence on the total cost; these costs are also initially estimated despite the fact that they demand a high level of information to be appraised. In this perspective materials within the construction site become of special interest. Rightly classified and used materials within the construction site have the potential to cost only half of the amount compared to buy materials for a similar use. To classify materials within the construction site and in particular for non-declared materials, two critical points arise: - Materials within the construction site are to be assessed as fitting for its intended application. The assessment is not correlated to a well defined classifying system and thus the usage of rock materials is biased by personal experience - Sampling and control of materials shall be done on a ready made construction layer surface. The material quality control comes late in the building process and may thus be connected to unnecessary high costs of restoration work The risk with the assessment system used for rock materials within the construction site is that the test results from the Nordic Ball mill may get a deciding role at the evaluation. A discrete test value is a limited description of rock materials physical characteristics regardless of the test, i.e. there remains an array of mineralogical and petrological characteristics that may disqualify the material for its intended use. But if a "good" test value from the Nordic Ball mill is obtained, then there is a high possibility that no further tests will be carried out and the material will be assessed as good for the intended use. If the production proceeds as normal the material will not undergo any further testing until the predetermined control on a ready construction layer surface is done. The material control on the ready made construction layer surface is only possible to utilise at a "later" phase of the production process, thus implying that any restoration activities will be expensive activities. If the control shows that the material is not suitable for the intended application, then this late revision of the materials potential usage might bring huge economical consequences to a project. To ensure safety of the use of rock materials within the construction site a more strict assessment system is needed, where usability is based on physical and geological properties.

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