不同方法设计SMA沥青混合料路用性能评价

为评价不同方法设计的沥青混合料路用性能,通过室内马歇尔试验、劈裂试验、单轴贯入试验、车辙试验、小梁弯曲试验及劈裂疲劳试验等对垂直振动成型法(VVTM)和马歇尔法(Marshall)设计的SMA沥青混合料路用性能进行了分析与评价。结果表明:1)VVTM法设计的SMA沥青混合料密度约为Marshall的1.02倍,最佳油石比约降低7%;2)与Marshall设计法相比,VVTM法沥青混合料的马歇尔稳定度、抗剪强度、动稳定度、低温劈裂强度至少可提升30%,疲劳性能和水稳定性均有提升,但抗弯拉强度略有降低;3)强嵌挤骨架密实级配(GM)可有效提升SMA沥青混合料路用性能。结论是VVTM法设计的SMA沥青混合料较Marshall法设计的有更好的路用性能。

Performance Evaluation of SMA Asphalt Mixture Design by Different Methods

In order to evaluate the road performance of asphalt mixtures designed by different methods,the Marshall,splitting,uniaxial penetration,rut,trabecular bending,and splitting fatigue tests were used to evaluate the road performance of SMA mixture designed via the vertical vibration method(VVTM)and Marshall method(Marshall).The results show that the density of SMA asphalt mixture designed using VVTM method is about 1.02 times that of the Marshall design method,the best asphalt-aggregate ratio is reduced for about 7%.Compared with Marshall design method,the Marshall stability,shear strength,dynamic stability and low temperature splitting strength of asphalt mixture designed by VVTM method can be increased by at least 30%,the fatigue performance and water stability are improved as well,but the tensile strength was lowered.The strong embedded frame compact gradation can effectively improve the road performance of SMA asphalt mixture.The conclusion is that the SMA asphalt mixture designed by the VVTM method has better road performance than that of the Marshall method.