不同岩性机制砂对沥青混合料路用性能的影响

摘要:

为指导不同岩性机制砂在沥青路面的应用，选择3种岩性机制砂制备沥青混合料，分析机制砂岩性对沥青混合料水稳定性、高稳定性、低温抗裂性能的影响，并并探索抗剥落措施对混合料性能的影响。结果表明:石灰岩机制砂混合料的稳定度和残留稳定度比均略高于辉绿岩机制砂混合料，远高于花岗岩机制砂，冻融劈裂试验也显示出一致的规律；相比花岗岩机制砂，辉绿岩机制砂混合料动稳定度提升52.6%，石灰岩机制砂混合料动稳定度提升45.2%；低温状态下，花岗岩机制砂混合料的抗裂性能最差，石灰岩机制砂和辉绿岩机制砂混合料的低温弯拉应变优良；使用抗剥落措施后，花岗岩机制砂和辉绿岩机制砂混合料水稳定性、高温性能均得到明显改善，其中残留稳定度比提升5%以上，残留强度比提升16%以上，动稳定度提升50%以上。

Abstract:

In order to guide the application of manufactured sands with different lithologies in asphalt pavement, three kinds of manufactured sands were selected to prepare asphalt mixtures. The effects of manufactured sands on water stability, high stability and low temperature crack resistance of asphalt mixtures were analyzed. The influence of anti-spalling measures on mixture performance was also explored. The results show that the stability and residual stability ratio of limestone machined sand mixture are slightly higher than that of diabase machined sand mixture and much higher than that of granite machined sand. The freeze-thaw splitting test also shows a consistent law. Compared with granite manufactured sand, the dynamic stability of diabase manufactured sand mixture is increased by 52.6%, while that of limestone manufactured sand mixture is increased by 45.2%. At low temperature, granite manufactured sand mixture has the worst crack resistance, while limestone manufactured sand and diabase manufactured sand mixture has excellent bending and tensile strain at low temperature. After using anti-spalling measures, the water stability and high temperature performance of the granite manufactured sand and diabase manufactured sand mixtures are significantly improved, among which the residual stability ratio is increased by more than 5%, the residual strength ratio is increased by more than 16%, and the dynamic stability is increased by more than 50%.