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为了揭示水泥稳定碎石半刚性基层材料的动、静态抗拉模量、抗压模量和弯拉模量之间的相关关系,开发了同时测试3种模量的新方法,推导出了在四点弯曲受力状态下水泥稳定碎石中的抗拉模量、抗压模量和考虑剪切效应影响的弯拉模量计算公式,开展了不同加载频率下的动态模量和加载速率为1 mm/min条件下静态模量的测试试验;揭示了水泥稳定碎石动态模量随加载频率的变化规律,建立了动、静态模量的转化关系,揭示了拉、压、弯3种动、静态模量的差异性。研究结果表明:水泥稳定碎石材料不是各向同性材料,呈现出明显的拉、压模量不同的特性;3种动态模量均随加载频率的增长呈现幂函数增长规律,动态模量试验条件更加符合路面实际受力状态;相同荷载级位下,3种动态模量都大于对应的静态模量,比值区间约为:1.11~1.91。
In order to reveal the correlation between dynamic and static tensile modulus, compressive modulus and flexural modulus of semi-rigid base material for cement stabilized macadam, a new method for simultaneous testing of three moduli was developed. The tensile modulus, compressive modulus and flexural modulus of cement-stabilized macadam under four-point bending stress are calculated, and the dynamic modulus and loading rate under different loading frequency are 1 mm / min static modulus test; revealed the dynamic modulus of cement stabilized macroscopical changes with the loading frequency, the establishment of dynamic and static modulus of the conversion relationship revealed the tension, compression, bending three kinds of movements , The difference of static modulus. The results show that cement stabilized macadam materials are not isotropic materials, showing obvious characteristics of tensile and compressive modulus. The dynamic modulus increases with the increase of loading frequency. The dynamic modulus test conditions More in line with the actual state of the pavement; the same load level, the three kinds of dynamic modulus greater than the corresponding static modulus, the ratio interval of about: 1.11 ~ 1.91.