Undersökning av asfaltbruk med olika fillersorter

Detta är en Uppsats för yrkesexamina på avancerad nivå från Lunds universitet/Trafik och väg

Sammanfattning: The properties of asphalt mastic, consisting of bitumen and filler, determine the asphalt's resilience and stability and ultimately durability. The reason to why asphalt mastics hasn’t been more in focus is probably the lack of an established methodology for measurement. However, the development is steadily moving towards mechanistic methods, resulting in parameter values for direct use in paving material design models. An example of such a technology is the DSR, Dynamic Shear Rheometer, known from the American Superpave design concept. The purpose of this thesis was to investigate the effects on the viscoelasticity of an asphalt mastic by four types of filler (two of granite, lime rock filler and cement), these fillers where added in four quantities (25, 34, 39.2 and 42.9 v/v %). Other methods were simulated with the DSR. Such as a creep test (MSCR), to examine resistance to rutting, and ductility, to describe tensile properties. In addition, stiffness and relaxation were measured to reflect the risk of low temperature shrinkage cracks, resembling the Superpave test with the Bending Beam Rheometer. Cement caused stronger increase of stiffness than the other types, lime rock filler had the lowest effect while the two granite fillers were relatively similar, somewhat higher than the lime filler. The step between 34 and 39.2 v/v %, which is a normal variation, corresponds to an increase in softening point by about 10 °

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