渗透型再生剂再生老化沥青混合料路用性能评价

Evaluation of Road Performance of Aging Asphalt Mixture Regenerated by Permeable Regenerating Agent

采用自主研发的渗透型再生剂对RAP掺量为50%的太旧高速废旧沥青混合料进行再生,基于残留稳定度试验、冻融劈裂试验、车辙试验、低温弯曲试验和疲劳试验研究了再生剂掺量对热再生沥青混合料路用性能的影响规律,并与普通市售再生剂再生后的沥青混合料进行性能对比。研究结果表明:随着渗透型再生剂掺量的提高,热再生沥青混合料水稳性能提高,低温抗裂性和疲劳性能得到大幅度提升,抗车辙因子和劲度模量均与再生剂的掺量呈负相关,渗透型再生剂的性能均优于普通市售再生剂。再生沥青与新沥青的材料特性差异缩小,渗透型再生剂改善了新旧沥青的界面结合。试验结果分析表明渗透型再生剂掺量为沥青混合料质量的3‰时,RAP掺量50%的热再生沥青混合料路用性能最佳。

Using self-developed permeable regenerating agent to regenerate the waste asphalt mixture with 50%RAP from Taijiu Expressway,the influencing law of the dosage of regenerating agent on the road performance of the thermal regenerated asphalt mixture was studied by residual stability,freeze-thaw splitting test,rutting test,low temperature bending test and fatigue test.And the performance of the thermal regenerated asphalt mixture was compared with the asphalt mixture regenerated by commercial regenerating agent.The studying results show that,for the thermal regenerated asphalt mixture,with the increase of the dosage of the permeable regenerating agent,the water stability is improved,the low temperature crack resistance and fatigue performance are significantly improved,and the rutting resistance factor and stiffness modulus are degraded.The performance of the permeable regenerating agent is better than that of commercial regenerating agent.