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为深入研究冻融循环作用对水泥稳定碎石材料疲劳性能的影响,通过弯拉强度及疲劳试验,探讨了不同冻融循环次数和不同应力比,对水泥稳定碎石材料强度及疲劳性能的影响。研究结果表明随着冻融循环次数的增加,材料内部损伤度也不断增加,并且前期下降速度快,后期下降速度平缓,当冻融循环次数达到20次时,水泥稳定碎石材料损伤度达到15.7%;随着冻融循环次数的增加,水泥稳定碎石材料的弯拉强度也随之降低,并且前期下降速度快,后期下降速度平缓,冻融循环次数达到20次时,弯拉强度降低到0.78 MPa,相比未冻融水泥稳定碎石材料,下降约为52%;水泥稳定碎石材料剩余疲劳寿命百分率随着损伤度增加而减小,并且表现为前期下降速度快,后期下降速度趋于平稳的特点,损伤度大于12%后,剩余疲劳寿命百分率下降较为缓慢。
In order to further study the effect of freeze-thaw cycles on the fatigue properties of cement-stabilized macadam materials, the effects of different freeze-thaw cycles and different stress ratios on the strength and fatigue properties of cement stabilized macadam materials were investigated by flexural strength and fatigue tests . The results show that with the increase of the number of freeze-thaw cycles, the internal damage degree of the material also increases, and the decline rate is fast in the early stage and slow down in the late stage. When the number of freeze-thaw cycles reaches 20 times, the damage degree of the cement stabilized macadam material reaches 15.7 %; With the increase of the number of freeze-thaw cycles, the bending strength of the cement stabilized macadam material also decreases, and the rapid decline in the early period, slow decline in the latter part of the smooth, freeze-thaw cycles reached 20 times, the bending strength decreased to 0.78 MPa, which is about 52% lower than that of the non-thawed cement stabilized macadam. The percentage of remaining fatigue life of the cement-stabilized macrogranite decreases with the increase of the damage degree, and the declining rate is fast In the steady characteristics, the damage degree is greater than 12%, the percentage of remaining fatigue life decreased more slowly.