基于胶粉和聚乙烯复合改性的沥青混合料综合性能试验研究

Properties of Asphalt Mixture Based on Composite Modification of Rubber Powder and Polyethylene

摘要: 为改善传统抗车辙沥青混合料低温抗裂性不足的问题，本文选取废旧轮胎胶粉(CR)和废旧聚乙烯(PE)作为添加剂，对沥青混合料进行复合改性，目的是在保证沥青混合料高温抗车辙性能的同时，提高其低温柔性，进而改善沥青混合料在低温条件下容易开裂的问题。通过前期沥青试验优选出两组复合改性配比制备了沥青混合料，对其高温抗车辙性能、水稳定性以及低温抗裂性能进行了测试，并与SBS改性沥青混合料进行了对比研究。结果表明，复合改性沥青混合料的高温性能达到了传统抗车辙沥青混合料的水平，但是在低温性能方面相比于传统抗车辙沥青混合料性能更优越，甚至接近SBS改性沥青混合料水平。因此，通过CR和PE对沥青混合料进行复合改性，在提高其高温性能的同时，能够兼顾低温性能。

Abstract: To improve the poor anti-rutting performance of traditional asphalt mixtures, this research con-ducted integrated modification by using scrap tire rubber powder (CR) and recycled polyethylene (PE) as additives, with the aim of improving the performance of asphalt mixture at both high and low temperatures, so as to solve the thermal cracking of asphalt mixture at low temperatures. Through preliminary experiment with two groups of composite, modified asphalt proportion of asphalt mixture was prepared, and its high temperature rutting resistance, water stability and low temperature crack resistance were tested and compared with SBS modified asphalt mixture. The results show that the high temperature performance of composite modified asphalt mixture achieves the level of traditional anti-rutting asphalt mixture, but its low temperature performance is significantly superior to the traditional anti-rutting asphalt mixture, and even close to the level of the SBS modified asphalt mixture. Therefore, the composite modification of asphalt mixture by CR and PE can give consideration to the low temperature performance while improving its high temperature performance.