Abstract
Cement-containing mineral powder can effectively improve the moisture stability of an asphalt mixture; therefore, this study systematically summarizes the research status of cement–mineral fillers on the performance of an asphalt mixture and determines the limitations of related studies. In this study, long-term performance tests of styrene-butadiene-styrene- (SBS)-modified asphalt mixtures are designed and evaluated with different blending ratios of the cement–mineral powder under three aging conditions. Moreover, the effect of the cement–mineral composite filler on long-term performance of the asphalt mixture using different blending ratios is determined. Cement improves the high-temperature performance and water stability of asphalt mixtures, but only for certain aging conditions. Considering the regulations for the road performance of asphalt mixtures for three aging conditions, as well as long-term performance considerations, the results indicated that the mass ratio of Portland cement to mineral powder must not exceed 2:2. Low-temperature bending and splitting tensile tests confirmed that an excessive amount of cement filler will embrittle the modified asphalt mixture during long-term aging, thereby deteriorating the tensile properties. The mechanism by which the filler influences the performance of the asphalt mixture should be further studied from the perspective of microscopic and molecular dynamics.
Highlights
Mineral fillers play an important role in improving the workability and stability of asphalt mixtures [1,2]
Specifications for Construction of Asphalt Pavements [10] stipulate that cement can be used instead of a part of the mineral powder, as a part of the filler to improve the adhesion of asphalt to acid stone, thereby improving the moisture stability
∆MS0, we found that after aging, the improvement in water stability due to the cement filler decreased
Summary
Mineral fillers play an important role in improving the workability and stability of asphalt mixtures [1,2]. Various types of fillers have different effects on the performance of asphalt mixtures [3,4]. The most common filler used in asphalt pavement is limestone ore [9]. It has become common practice to use cement instead of ore as a filler in asphalt pavements in hot and humid areas. It is common worldwide to mix various filler materials for replacing mineral powder to improve the performance of asphalt mixtures [11,12,13]
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