掺PR添加剂沥青混合料的高温性能评价方法

Evaluation Methods of High Temperature Performance of Asphalt Mixture with PR Additives

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(PR plast S)和PR.M(PR flex module)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γ4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,充分反映了混合料的破坏机理.

An investigation is made into the evaluation methods of the performance of the asphalt mixture with PR additives at high temperature based on the rutting test, uniaxial penetration test and repeated shear test （constant height） （RSCH）. The results of the rutting test show that,for the confliction between dynamic stability and rutting depth, it is hard to discriminate the impacts of PR. S（PR plast S） and PR. M（PR flex module） on the high temperature performance of mixtures. With the ultimate shearing strength of uniaxial penetration test and k1, k2, n, γ of RSCH, as the evaluation indexes of high temperature performance of the asphalt mixture with PR additives, the same conclusion is drawn, and both of the two methods are suitable for high temperature performance evaluation. The four indexes of RSCH not only represent high temperature performance of the asphalt mixture with PR additives, but also discriminate the different steps of shearing deformation progress, therefore, the mixture damage mechanics is depicted.