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为分析冻融循环对沥青混合料性能的影响,本文对冻融循环作用后沥青混合料劈裂强度、空隙率、动态模量以及疲劳性能进行了试验分析。试验研究结果表明,随着冻融循环次数的增加,沥青混合料劈裂强度、动态模量及疲劳寿命逐渐降低,且冻融循环初期衰减较快;沥青混合料空隙率随冻融循环次数的增加总体呈增加趋势,并且SMA沥青混合料空隙率增加程度大于普通密级配沥青混合料。
In order to analyze the influence of freeze-thaw cycles on the properties of asphalt mixture, the splitting strength, voidage, dynamic modulus and fatigue properties of the asphalt mixture after freeze-thaw cycles were analyzed in this paper. Experimental results show that the splitting strength, dynamic modulus and fatigue life of asphalt mixture gradually decrease with the increase of the number of freeze-thaw cycles, and the decay rate of asphalt mixture decreases rapidly in the initial stage of freeze-thaw cycle. The voidage of asphalt mixture increases with the number of freeze-thaw cycles The overall increasing trend is increasing, and the porosity of SMA asphalt mixture increases more than ordinary dense asphalt mixture.