沥青混合料低温抗裂性能评价及影响因素

Influencing factor and appraising on anti-cracking of asphalt mixture at low temperature

通过低温(0℃,-10℃,-20℃)弯曲试验,对3种沥青、8种级配、2种石料组成的沥青混合料的低温性能进行了全面评价,并首次引入了一个判别沥青混合料低温破坏属性的参数Su,当Su接近于1时,混合料发生脆性破坏;而当Su大于1时,发生柔性破坏。最后探讨了影响沥青混合料低温抗裂性的主要因素。

The low temperature anti-cracking of ashpalt mixture with 3 kinds of bitumen、8 kinds of aggregate grading and 2 kinds of stone were comprehensively appraised by low temperature bend test (0 ℃,-10 ℃,-20 ℃).A parameter S_u to differentiate destore character of mixture was introduced. When S_u approaches 1,faiture belongs to brittle.When S_u exceeds 1,faiture belongs to flexible.The main influencing factors on anti-cracking at low temperature were explored.