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针对青藏高原地区的气候特点,试验分析了油石比、温度、加载速率等对沥青混合料劈裂强度的影响。结果表明,不同温度条件下,油石比对沥青混合料劈裂强度的影响有所不同。高温时,沥青混合料劈裂强度随油石比的增大而波动变化,但影响较小;常温时,劈裂强度随油石比的增大呈抛物线形变化,出现峰值;低温时,劈裂强度随油石比的增大呈增大趋势。在相同的加载速率下,劈裂强度随温度的升高而减小。在常温及高温条件下,劈裂强度最大值及其对应的油石比均随温度的升高而减小。-10℃时的劈裂强度对加载速度的变化比较敏感。
According to the climatic characteristics of the Qinghai-Tibet Plateau, the influence of the ratio of oil to rock, temperature, loading rate and so on on the splitting strength of asphalt mixture was analyzed. The results show that the influence of the ratio of oil to stone on the splitting strength of asphalt mixture is different under different temperature conditions. At high temperature, the splitting strength of asphalt mixture fluctuates with the increase of the ratio of oil to stone, but the influence is small. At room temperature, the splitting strength parabolically changes with the increase of the ratio of oil to stone, and the peak value appears. At low temperature, the splitting strength With the increase of oilstone ratio increases. At the same loading rate, the splitting strength decreases with increasing temperature. Under normal temperature and high temperature conditions, the maximum splitting strength and the corresponding ratio of whetstone decrease with increasing temperature. The splitting strength at -10 ℃ is sensitive to the change of loading speed.