不同粗集料组成的沥青混合料性能研究

粗集料是沥青混合料骨架结构的重要组成部分,不同种类和性质的粗集料对沥青混合料性能的影响各不相同。选取了7种不同种类和产地的粗集料,进行了基本物理力学性能试验,并以AC-16C粗型密级配为例,考察了不同粗集料对沥青混合料性能的影响。结果表明,粗集料性能对沥青混合料高温稳定性和水稳定性具有显著的影响,对低温抗裂性无影响,在固定其他条件的情况下,粗集料表观密度越小、吸水率越大,其沥青混合料动稳定度D S和劈裂强度比TSR越大。

Research on Performance of Asphalt Mixtures Composed of Different Coarse Aggregates

Coarse aggregate is the important component of skeleton structure in asphalt mixtures.Aggregates of different types and properties have different influence on asphalt mixtures performance.Seven different coarse aggregates are selected in this paper and its basic physical and mechanical capabilities are measured according to the criterion.Taking an example of AC-16C gradation,asphalt mixtures performance influenced by different coarse aggregate are examined.The results show that coarse aggregates properties have very notable influence on high-temperature stability and moisture stability ofasphalt mixtures.On the contrary,low-temperature anti-cracking of asphalt mixtures is irrelevant to coarse aggregates properties.When other factors are fixed,dynamic stability(DS) and tensile splitting ratio(TSR) are much more increased with the smaller of apparent density and the greater of water absorption of coarse aggregates.