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沥青的临界开裂温度是AASHTO Mp1a规范提出的沥青低温评价指标,是根据弯曲梁流变仪和直接拉伸仪的结果经过数据回归计算得到的。按照沥青临界开裂温度的计算过程进行了试验,并对结果进行了分析;对沥青的劲度模量主曲线的拟合模型进行了研究,分析了降温速率和收缩系数对沥青临界开裂温度的影响,结果表明计算临界开裂温度的方法需要进一步改善。
The critical cracking temperature of asphalt is the index of asphalt cryogenic evaluation proposed by the AASHTO Mp1a specification and calculated by data regression according to the results of bending beam rheometer and direct tensile tester. According to the calculation process of asphalt critical cracking temperature, the results were analyzed. The fitting model of asphalt master stiffness modulus was studied. The effect of cooling rate and shrinkage factor on the critical cracking temperature of asphalt was analyzed. , The results show that the method of calculating the critical cracking temperature needs further improvement.