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目前,世界各国用于研究水泥稳定碎石力学特性的圆柱体试件普遍采用静力压实(QSCM)或葡式击实成型(PCM)。然而,现场普遍采用振动压路机振碾方式压实水泥稳定碎石基层。为了模拟现场压实工况,提出了试件垂直振动成型方法 (VVCM)并验证了其可靠性,对比研究了QSCM与VVCM对水泥稳定碎石物理特性(试件含水量和矿料级配)和力学特性(无侧限抗压强度、劈裂强度和回弹模量)的影响。试验结果表明:QSCM试件的力学强度为现场芯样的35.6%,VVCM试件的力学强度为现场芯样的93%;VVCM试件的抗压强度、劈裂强度和抗压回弹模量分别为QSCM试件的2.5、1.9和1.6倍。研究证明VVCM比QSCM更适合用于评价水泥稳定碎石材料性能。
At present, cylindrical compacts used to study the mechanical properties of cement stabilized macadam are commonly used in static compaction (QSCM) or Portuguese compaction molding (PCM). However, vibrating roller vibrating method is commonly used to compaction the cement stabilized macadam base. In order to simulate the field compaction conditions, a vertical vibration modeling method (VVCM) of the specimen was proposed and its reliability was verified. The comparison between QSCM and VVCM on physical properties of cement stabilized macadam (water content and mineral grade) And mechanical properties (unconfined compressive strength, splitting strength and resilience modulus). The experimental results show that the mechanical strength of QSCM specimen is 35.6% of that of on-site core specimen, and the mechanical strength of VVCM specimen is 93% of that of on-site core specimen. The compressive strength, splitting strength and compressive resilience modulus Respectively, 2.5, 1.9 and 1.6 times QSCM specimens. Studies have shown that VVCM is more suitable than QSCM for evaluating the performance of cement stabilized macadam materials.