为了研究沥青混合料在冻融循环及除冰盐溶液共同作用下的抗裂性能，在断裂力学理论基础上，采用半圆试件弯拉实验，并通过J 积分来评价沥青混合料的抗裂性能；利用极差分析法原理和灰色关联熵分析法原理深入分析沥青种类、冻融循环次数和除冰盐浓度对沥青混合料抗裂性能的影响。结果表明，盐冻融循环作用下，对断裂韧度影响程度的大小关系为沥青种类＞冻融循环次数＞除冰盐浓度；与基质沥青混合料、SBS改性沥青混合料和复合胶粉改性沥青混合料相比，橡胶粉改性沥青混合料具有更好的抗裂性；随着冻融循环次数及盐浓度的增加，混合料的抗裂性逐步降低。
In order to study the crack resistance of asphalt mixture under the freeze-thaw cycle and deicing salt solution,using SCB test to complete destruction test on the basis of fracture mechanics and evaluate crack re-sistance of asphalt mixture through the J integral;using the range analysis and the analysis of grey entropy to analyze the impact of asphalt mixture of asphalt type,freezing and thawing cycles and deicing salt concentration. asphalts show that:the influence degree of salt freezing and thawing cycle is that:the type of asphalt >cycles>salt concentration;the rubber powder modified asphalt mixture have the best crack resistance among all of them;the crack resistance of asphalt mixture become weaker gradually along the the increase of cycling times.
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