沥青混合料低温抗裂性能评价指标

Evaluation Method for Low Temperature Anti-cracking Performance of Asphalt Mixture

为了确保沥青路面在低温下的抗裂稳定性 ,就必须用实验方法来评定它在低温条件下的性能 ,然而到目前为止仍未有统一方法 ,因此尽快找到一种科学而又实际的评价指标 ,对于沥青路面低温缩裂问题的解决有着深远的意义。以沥青混合料低温抗裂性评价指标作为研究对象 ,在分析目前一些评价方法的基础上 ,通过对不同品种沥青混合料试验结果进行分析总结 ,发现沥青混合料的低温压缩应变能指标 ,更能反映不同沥青混合料的低温性能 ;对于低温蠕变试验 ,采用 0℃、10 %破坏荷载应力水平更适用于不同沥青混合料 ,利用 0℃压缩应变能作为沥青混合料低温抗裂性能评价指标 ,方法简便易于推广。

The evaluation methods of low temperature anti cracking performance of asphalt mixture are not unified.So to find an evaluation method of anti cracking performance of asphalt mixture as soon as possible is greatly important to reduce shrink cracking of asphalt pavement on the basis of analyzing and researching some evaluation methods from China and abroad.Through the analysis of tests and their results, it is found that the compressive strain energy of asphalt mixture at low temperature can reflect the low temperature performance, and asphalt the creep test at low temperature, can show the performance of asphalt mixture at 0℃,10% failure load. The compressive strain energy method can evaluate low temperature performance of asphalt mixture. The results indicate that the compressive strain energy method is simple and effective.