基于振动波能量作用的SBS改性沥青混合料在极端湿热环境下的性能研究

Study on Performance of SBS Modified Asphalt Mixture Based on Vibration Wave Energy in Extreme Damp and Hot Environment

为了探讨振动波能量对SBS改性沥青及其混合料的作用效果,开展了常规搅拌与振动搅拌的对比试验,获取了振动参数与沥青降黏率的变化规律,分析了振动频率对沥青混合料最佳油石比、高温稳定性、水稳定性的影响情况,设置了高温、重载、浸水这3种极端环境条件,进一步分析振动搅拌得到的沥青混合料在极端环境下的适用性。试验结果表明,振动幅值和振动频率与沥青降黏率呈正比关系,振动搅拌能够降低SBS沥青混合料最佳油石比,同时振动搅拌得到的沥青混合料高温抗车辙性能、水稳定性能、极端环境适用性均优于常规搅拌得到的沥青混合料。振动搅拌技术可提高SBS改性沥青与集料混合程度,节省沥青用量,改善混合料使用性能并延长使用寿命。

In order to explore the effect of vibration wave energy on SBS modified asphalt and its mixture,this paper conducted a comparison test between conventional mixing and vibration mixing,obtained the variation law of vibration parameters and asphalt viscosity reduction rate,analyzed the effect of vibration frequency on the optimum asphalt aggregate ratio,high temperature stability and water stability of asphalt mixture,set three extreme environmental conditions of high temperature,heavy load and water immersion,and further analyzed the applicability of asphalt mixture obtained by vibration mixing in extreme environments.The test results show that the vibration amplitude and vibration frequency are positively related to the viscosity reduction rate of asphalt,and vibration mixing can reduce the optimum asphalt aggregate ratio of SBS asphalt mixture,while the high temperature rutting resistance,water stability and extreme environmental suitability of asphalt mixture obtained by vibration mixing are better than those obtained by conventional mixing.Vibratory mixing technology can improve the degree of SBS modified asphalt and aggregate mixing,saving asphalt consumption,improving the performance of the mixture and extending the service life.