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青藏高原寒冷地区年平均气温低、昼夜温差大、冻融循环频繁,对沥青路面力学性能影响明显。通过沥青混合料冻融循环单轴压缩试验,分析了冻融循环次数以及油石比对混合料抗压性能的影响。结果表明:随着冻融循环次数的增多,沥青混合料的抗压强度、抗压回弹模量均呈减小趋势,最初的几次冻融循环混合料性能衰减较快,经历8～10次冻融循环后性能衰减趋于平缓;油石比对沥青混合料的抗压性能影响较大,油石比较小的混合料抗压性能较优,但油石比较大的混合料在冻融循环作用下抗压性能衰减趋势较小;冻融循环作用对青藏高原寒冷地区混合料的抗压性能有明显影响;AC-13混合料的油石比取5.5%或适当增加,可以提高其冻融循环作用下的抗压性能。研究结果可为高原寒冷地区沥青路面建设提供参考。
The Qinghai-Tibet Plateau cold area of the annual average temperature is low, large temperature difference between day and night, frequent freeze-thaw cycles, the mechanical properties of asphalt pavement significant impact. Through the freeze-thaw cycling uniaxial compression test of asphalt mixture, the influence of the number of freeze-thaw cycles and the ratio of oil to rock on the compressive properties of the mixture was analyzed. The results show that with the increase of the number of freeze-thaw cycles, the compressive strength and compressive resilience modulus of asphalt mixture decrease. The performance of the first freeze-thaw cycle mixture decay rapidly, After the freeze-thaw cycle, the performance attenuation tends to be gentle; the ratio of oil to rock has a greater impact on the compressive performance of asphalt mixture, while the smaller the mixture of whetstone has better compressive strength, while the larger mixture of whetstone under the action of freeze-thaw cycle The compressive strength of the AC-13 mixture decreases with the increase of the freezing-thawing cycle, while the compressive strength declines less. The freeze-thaw cycle has a significant effect on the compressive strength of the mixture in the cold region of the Qinghai-Tibet Plateau. The compressive properties. The results can provide reference for the construction of asphalt pavement in cold area of plateau.