盐冻融循环下添加剂对沥青流变性能的影响

为了研究盐冻融循环下添加剂对沥青流变性能的影响,采用木质素纤维、聚酯纤维、橡胶粉、PE、岩沥青、消石灰六6种添加剂制备沥青胶结料,对不同沥青胶结料分别进行动态剪切流变试验、弯曲梁流变试验以及疲劳试验。结果表明:经过盐冻融循环作用,掺加添加剂的沥青抗车辙因子显著提高,从而改善了沥青的高温性能,其中PE、橡胶粉对其改善更为显著;木质素纤维、聚酯纤维明显降低了沥青的低温劲度模量,对沥青的低温抗开裂性能有较大改善;聚酯纤维改善沥青疲劳性能的效果最好,PE次之,其他几种添加剂对沥青的疲劳性能改善效果相对不明显。

Effect of Additives on Rheological Properties of Asphalt Under Salt Freezing Cycles

In order to study the influence of additives on the rheological properties of asphalt under the salt freezing cycles,six additives were used to prepare asphalt binders,including lignin fiber,polyester fiber,rubber powder,PE,rock asphalt and lime.The dynamic shear rheological test,bending beam rheological test and fatigue test were carried out on different asphalt binders.The results show that the resistance to rutting of the asphalt mixed with additives is significantly improved through the salt freezing cycles,especially with PE and rubber powder,thereby improving the high-temperature performance of the asphalt;lignin fiber and polyester fiber significantly reduce the low-temperature stiffness modulus of the asphalt,and greatly improve the low-temperature crack resistance;polyester fiber has the best effect on improving fatigue performance,followed by PE,and several other additives show unnoticed effects.