动静水环境作用下级配离析对沥青混合料水损害的影响评价

Evaluation of influence of gradation segregation on pavement moisture damage under action of dynamic and static water environment

针对现有级配离析对沥青混合料抗水损害性能影响研究的不足,基于水敏感性测试仪(MIST)研究了多种水环境作用和不同离析程度对沥青混合料抗水损性能的影响。试验结果表明:水环境作用对劈裂强度和马歇尔稳定度值的削弱大小顺序为“静态浸水+MIST(长期+短期作用)”>“MIST(短期作用)”>“静态浸水(长期作用)”;出现级配离析后,劈裂强度和马歇尔稳定度值大小顺序为HC(粗集料重度离析)<LC(粗集料轻度离析)<D(无离析)<LF(细集料轻度离析)<HF(细集料重度离析);动水环境作用加剧级配离析对劈裂强度和马歇尔稳定度的影响,且级配离析对渗水系数的影响远大于水环境作用。

In view of the deficiency of the existing research on the effect of gradation segregation on the water damage resistance of asphalt mixture,the effects of various water environment effects and different segregation degrees on the water loss resistance of asphalt mixture were studied based on the moisture sensitivity tester(MIST). The results show that:the weakening order of water environment on splitting strength and marshall stability is "static immersion + MIST(long-term + short-term effect)" > "MIST(short-term effect)" > "static immersion(long-term effect)";after the occurrence of gradation segregation,the order of splitting strength and Marshall stability is HC(heavy segregation of coarse aggregate)< LC(mild segregation of coarse aggregate)< D(no segregation)< LF(mild segregation of fine aggregate)< HF(heavy segregation of fine aggregate);the effect of hydrodynamic environment aggravates the effect of gradation segregation on splitting strength and Marshall stability,and the effect of gradation segregation on water permeability coefficient is much greater than that of water environment.