湿热地区高黏度改性沥青路用性能研究

Road Performance of Modified Asphalt with High Viscosity Using in Hot Humid Area

文中针对南方湿热地区的特点,研究该区域透水沥青路面用高黏度改性沥青制备,分析其路用性能,着重关注不同改性剂对湿热地区高黏度改性沥青性能的影响。以60℃动力黏度、多应力重复蠕变试验获得不可恢复柔量和恢复率分析高黏度改性沥青高温性能;以弯曲梁流变仪测定其低温劲度模量;以拉拔强度分析其抗水损害能力,同时以沥青混合料的冻融劈裂强度比TSR进行验证。结果表明:高黏度改性沥青高温性能随废胶粉掺量增大而增大,但拉拔强度则降低,且其掺量超过10%后对沥青低温性能有损伤;SBS掺量越大,沥青高低温性能均有所提高,但超过6%,沥青拉拔强度降低,不利于黏结。因此,应用于湿热地区的高黏度改性沥青,其聚合物改性剂存在最佳范围。

This paper is aimed at studying the preparation of modified asphalt with high viscosity for permeable asphalt pavement using in the humid and hot area of South China. The main work in this paper is focused on the effect of different polymer modifier on the road performance of modified asphalt with high viscosity for humid and hot area. Dynamic viscosity at 60℃, Percent Recovery and Non-Recoverable Creep Compliance from multiple stress creep test were used to obtain the high-temperature properties of asphalt samples. Stiffness at low temperature were captured form bending beam rheometer. Drawing strength were used to evaluate the anti-water ability, and the freeze thaw splitting strength ratio of asphalt mixture were used to verify the results. The results showed that: the high temperature properties of modified asphalt with high viscosity were increased and drawing strength were decreased with the increasing amount of waste rubber powder, yet the low temperature properties were damaged after waste rubber powder content surpassed 10%. The high and low-temperature properties of modified asphalt were improved with SBS amount, but the drawing strength were decreased when SBS amount surpassed 6%. Therefore, there was an optimum range for the polymer modifier amount in modified asphalt with high viscosity using in the humid and hot area.