基于不同取料方法的废旧沥青混合料变异性分析

Variability analysis of reclaimed asphalt pavement based on different sampling methods

为了研究不同取料方法对废旧沥青混合料(reclaimed asphalt pavement,RAP)变异性的影响,分别采用整堆取样法(buck sampling method,BSM)和分堆取样法(stack sampling method,SSM)获取RAP试样,分析了不同RAP试样的含水率、老化沥青含量和矿料级配,并通过变异系数对比评价了2种取样方法对RAP性能变异性的影响。结果表明,分堆取样法可有效减小RAP试样的含水率、老化沥青含量和矿料级配变异系数,提高RAP样本的均匀性,有利于科学评价RAP的性能,指导再生沥青混合料的设计与生产。

In order to study the influence of sampling methods on the variability of reclaimed asphalt pavement(RAP),the RAP samples were obtained by the bulk sampling method(BSM)and the stack sampling method(SSM),respectively in the present work.The water content,aged asphalt content and mineral aggregate grading of different RAP samples were analyzed,and the influences of the two sampling methods on the variability of water content,aged asphalt content and mineral aggregate grading of RAP were evaluated by comparing the coefficient of variation.The results show that the stack sampling method can effectively reduce coefficient of variation of water content,the aged asphalt content and the mineral aggregate grading of RAP samples,thereby improving the uniformity of the RAP samples,which is benifitial to both the evaluation of the performance of the RAP scientifically and the guidance of the design and production of recycled asphalt mixture.