橡胶沥青在灌入式半柔性路面中的应用

Application of asphalt-rubber to pouring semi-flexible pavement

针对高温潮湿地区重载交通路面技术要求,对废橡胶粉改性沥青半柔性路面(AR-SFAC)的高温稳定性、低温抗裂性和水稳定性等性能进行了室内试验研究,并与橡胶沥青混凝土(RAC-16)进行了对比分析。结果表明,相同橡胶沥青拌制的橡胶沥青半柔性路面混合料AR-SFAC-20的动稳定度比橡胶沥青混凝土RAC-16高很多,其残留稳定度和冻融劈裂强度比分别比橡胶沥青混凝土大18.2%和14.1%,且其温度在-10℃下的破坏拉伸应变较大,劲度模量较小。

Considering the technical requirements of heavy load pavement in hot and moist areas,the performances of semi-flexible pavement with asphalt-rubber(AR-SFAC),such as the high temperature stability,low temperature anti-cracking and moisture susceptibility,are tested.The characteristics of AR-SFAC are compared with those of the asphalt-rubber concrete mix(RAC).The results show that: with the same binder,the dynamic stability of semi-flexible pavement mixture with asphalt-rubber(AR-SFAC-20) is much larger than that of rubber asphalt concrete(RAC-16),and the retained stability and indirect split tensile strength after freeze-thaw of AR-SFAC-20 are higher than those of RAC-16 by 18.2% and 14.1% respectively;the tensile strain at failure of the AR-SFAC-20 binders at-10℃ is higher than that of the RAC-16,but the stiffness modulus of the AR-SFAC-20 is smaller than that of the RAC-16.10 tabs,7 figs,7 refs.