老化对沥青混合料低温抗裂性能的影响研究

Influence of Different Aging State on the Performance of Asphalt Mixtures at Low-Temperature

采用劈裂试验方法,分别对新拌、短期老化和长期老化状态下沥青混合料的低温性能进行了对比研究.试验表明,未老化的沥青混合料的低温性能不能反映和预测老化后的性能,并且在评价沥青混合料低温性能时,短期老化试验比长期老化试验更为敏感,由此说明在沥青混合料低温性能试验评价过程中充分考虑老化因素的影响是必要的.

The Indirect Tensile Test was used to evaluate the performance of asphalt mixtures at low-temperature under different aging states. Through the comparison of the results from original asphalt mixtures, STOA asphalt mixtures and LTOA asphalt mixtures, tests show that the original asphalt mixture can not reflect the real performance of the asphalt mixture in the spot. And the short - term aging specimens are more sensitive than long-term aging specimens in appraising the performance of the asphalt mixture at low-temperature. The results indicate that the consideration of aging during the asphalt mixture performance evaluations is necessary.