Effect of Aggregate Shape on the Surface Properties of Flexible Pavement

다국어 초록 (Multilingual Abstract)

One of the most important properties of flexible pavements in terms of tire-pavement interface is surface texture. The texture of apavement surface and its ability to resist polishing effect of traffic is of prime importance in providing skidding resistance. Pavementsurface texture greatly contributes to tire-pavement skid resistance which has a direct effect on traffic operation and safetyparticularly at high speeds. Doubtless, there exists a close relationship between pavement surface texture and aggregate angularitywithin the wearing course. This paper is aimed to determine the effect of aggregate shape on the surface properties of Hot MixAsphalt (HMA). Two different mineralogical types of aggregate (basalt and limestone) have been crushed with impact, jaw and rolltype of crushers. Various types of aggregate with different shapes have been mixed with 50/70 penetration grade bitumen to formdense graded mixtures. Test methods related with the evaluation of shape and texture characteristics have been utilized tocharacterize the geometrical properties of aggregates. The texture and friction properties of asphalt slabs have been evaluated bymeans of sand patch test, 3D laser scanner and dynamic friction tester respectively. The results indicated that a relationship existsbetween the shape characteristics of aggregate and the surface properties of HMA.

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