Asphalt concrete is a composite material where asphalt is used as a binder and mineral aggregate mixed together. In cold climates, freezing of the groundwater underneath can crack asphalt even in one winter. Our goal was to characterize the aggregate surface as well as the bitumen / aggregate interface and secondly, to treat the aggregate surface to improve the durability. The adhesive adhesion of bitumen depends on the mineralogical composition and the surface texture of the aggregates. Aggregates that have a high content of silica were more likely to be water sensitive than those with a high content of carbonate. Besides, results pointed out that a strong ability of the aggregates to release mineral elements in water led to a better adhesion with bitumen, especially elements that increase the pH. This method turned out to be an efficient way to increase the durability of the asphalt concrete, especially with cement.

Improvement of the water resistance in asphalt concrete by hydrated lime treatment

245th National Meeting (2013)

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