橡胶颗粒沥青混合料的耐久性及改善措施研究

Research on Durability of Granulated Crumb Rubber Asphalt Mixture and Improvement Measures

通过多养护循环及混合料短期老化后的冻融劈裂和肯塔堡飞散试验,对掺入2.5%橡胶颗粒沥青混合料(70号沥青)的耐久性进行研究,提出添加铝酸酯偶联剂(ASA)来提高橡胶颗粒沥青混合料耐久性的技术措施,并将70号沥青橡胶颗粒沥青混合料与SBS改性沥青橡胶颗粒沥青混合料的性能指标进行对比。结果表明:橡胶颗粒沥青混合料具有良好的耐久性,ASA能有效提高橡胶颗粒沥青混合料抗飞散损失的长期稳定性;采用粘度较大的SBS改性沥青对提高橡胶颗粒沥青混合料耐久性的有效性有待验证;短期老化试验评价橡胶颗粒沥青混合料耐久性的合理性有必要进一步讨论。

Based on freeze-thaw split test and Cantabro stripping test after multiple curing cycles and short-time ageing of mixture,this paper studies durability of asphalt mixture mixed with 2. 5% rubber crumbs（ No. 70 asphalt）,proposes a technical solution to add aluminate coupling agent（ ASA） to improve durability of granulated crumb rubber asphalt mixture,and compares performance indices of granulated scrub rubber asphalt mixture of No. 70 asphalt with those of granulated crumb rubber asphalt mixture of SBS modified asphalt. The results show that the granulated crumb rubber asphalt mixture has perfect durability,and ASA can effectively improve long-term stability of the granulated crumb rubber asphalt mixture against scattering loss; the effectiveness of SBS modified asphalt with high viscosity to improve durability of the granulated crumb rubber asphalt mixture is to be verified; and it is necessary to further discuss the rationality of evaluating durability of the granulated crumb rubber asphalt mixture via short-time ageing test.