掺加PR添加剂沥青混合料的高温性能评价方法

Evaluation Methods of Asphalt Mixture’s High Temperature Performance with PR Additives Added

摘要:

选用车辙试验、单轴贯入试验和恒定高度重复剪切试验（RSCH）来进行掺加PR添加剂沥青混合料的高温性能评价方法研究。车辙试验结果表明，在区分PR.S和PR.M两者对混合料高温性能的影响时，动稳定度和车辙深度的背离导致其无法确定。采用单轴贯入试验得到的极限抗剪强度和RSCH得到的k1，k2，n和γ 4个参数作为掺加PR添加剂混合料的高温性能评价指标，得到了相同的结论，能很好地进行其高温性能的评价。RSCH的4个参数不仅能表征出掺加PR添加剂混合料的高温抗剪能力，而且能很好地表征混合料发生剪切破坏各个阶段的剪切应变发展情况，充分反映出了混合料的破坏机理。

Abstract:

Researched on the evaluation methods of asphalt mixture high temperature performance with PR additives added using rutting test, uniaxial penetration test and repeated shear test (constant height) (RSCH). The results of rutting test show that, for the confliction between dynamic stability and rutting depth, it is hard to discriminate the impacts on mixture high temperature performance between PR.S and PR.M. Using extreme shearing strength of uniaxial penetration test and K1, K2, N, γ of RSCH, as the evaluation indexes of asphalt mixture high temperature performance with PR additives added, obtain the same conclusion, and both of the two methods are suitable for high temperature performance evaluation. The four indexes of RSCH not only represent asphalt mixture high temperature performance with PR additives added, but also discriminate the different steps of shearing deformation progress, and represent the mixture damage mechanics.