振动旋转压实级配碎石制样方法及力学性能试验

为解决级配碎石物理指标和力学指标室内测试结果与工程实际存在差异的问题,利用自主研制的道路材料振动旋转压实仪,通过振动旋压的施力方式模拟压路机实际碾压作用机制,开展级配碎石试件室内制样方法研究.试验结果表明:振动旋转压实试件的密实程度最好,压实密度最高可达2.39 g·cm^-3;试件压实密度随着旋压压力的增加和压实时间的增长而提高,最终趋于稳定;振动旋转压实试件的弹性模量与加州承载比值(R_CB)最高,抗压回弹模量为354.716 MPa,R_CB为328%;振动旋转压实试件的物理、力学指标与工程实测数据接近,说明该制样方法能较好地模拟工程实际.

Sample Preparation Methods and Mechanical Property Tests of Graded Crushed Stone Under Gyratory and Vibration Compaction

In order to solve the result differences between laboratory and in-situ tests of physical and mechanical properties, adopting the self-developed road material vibration rotary compaction device, the engineering compaction mechanism was simulated by the vibration-rotation and compaction methods, the laboratory study on the specimens preparation methods of graded crushed stone was conducted. Test results show that the specimen density produced by the vibration-rotation and compaction methods is the best, the highest compaction density could is 2.39 g·cm^-3; as the vibration-rotation and compaction load level and compaction time increase, the compaction density of specimens increases, then becomes stable; the compressive resilient modulus and California bearing ration(R_CB)values of vibration-rotation and compaction specimens are the highest, the value of compressive resilient modulus is 354.716 MPa, and the R_CB is 328%; the physical and mechanical properties of vibration-rotation and compaction specimens is close to the in-situ test results, which shows this preparation methods could properly simulate the actual engineering.