不同成型方式乳化沥青冷再生混合料力学特性研究

Mechanical properties of emulsified asphalt cold recycling mixture with different forming methods

为深入探讨不同成型方式对乳化沥青冷再生混合料力学特性的影响,通过制备马歇尔试件、圆柱体试件,研究了垂直振动法和传统方法对冷再生混合料力学特性的影响,并应用Weibull分布建立疲劳方程。结果表明:与传统方法设计的冷再生混合料相比,垂直振动法最佳含水率降低10%,乳化沥青最佳用量降低10%,最大干密度提高1.021倍;与马歇尔试件相比,垂直振动圆柱体试件马歇尔稳定度MS、25℃劈裂强度、冻融劈裂强度分别提高40%,32%及57%;通过疲劳方程的截距a和斜率b可看出,垂直振动法试件在高应力下抗疲劳性能和对应力变化的敏感性优于马歇尔法试件,即垂直振动法a值大于马歇尔法,b值小于马歇尔法。

In order to investigate the influence of different moulding methods on the mechanical properties of cold recycled emulsified asphalt mixture,the effects of vertical vibration method and traditional method on the mechanical properties of cold recycled asphalt mixture were studied by preparing Marshall specimens and cylinder specimens,and the fatigue equation was established by Weibull distribution.The results show that by the vertical vibration method,the optimal moisture content and optimal emulsified asphalt content of the mixture are reduced by 10%respectively,and the maximmum dry density of the mixtare are increased 1.021 times,compared with the mixture by the traditional method.Compared with Marshall Specimens,the Marshall stability MS,25℃splitting strength and freeze-thaw splitting strength of vertical vibration cylinder specimens increase by 40%,32%and 57%respectively.Through the intercept a and slope b of fatigue equation,it can be seen that the fatigue resistance and sensitivity of vertical vibration specimens to stress change under high stress are better than those of Marshall method specimens,that is,the value of a in the vertical vibration method is greater than that of Marshall method,and the value of b in the vertical vibration method is less than that of Marshall method.