沥青混合料高温蠕变失稳点预测模型及参数影响

发布时间：2018-04-16 00:28

  本文选题：沥青混合料 + 蠕变失稳点　； 参考：《东南大学学报(自然科学版)》2017年05期

【摘要】：基于压剪破坏理论,建立了密级配沥青混合料高温蠕变失稳点预测模型,并研究了模型参数的影响因素.利用三轴压缩试验,获得沥青混合料不同围压下高温抗压强度和抗剪强度参数.在相同温度及对应围压下,实施不同载荷水平的三轴动态蠕变试验,得到混合料高温失稳点对应的流变次数F_N,分析了不同围压下F_N变化规律,建立了一个新的预测F_N模型.此外,通过试验对掺加不同添加剂混合料的F_N预测值进行了验证,进一步分析了级配及温度对模型参数的影响.结果表明,沥青混合料失稳点F_N预测结果与试验结果有较好一致性,改变级配或试验温度均会对预测模型参数产生较大影响,而添加剂的影响则可忽略,当温度为60℃时AC20级配混合料参数a,b值比AC13级配参数分别减小约52.1%,18.3%,且同一级配材料随温度升高,参数a波动较大,b则增长明显.
[Abstract]:Based on the theory of compression and shear failure, the prediction model of creep instability point of dense gradation asphalt mixture at high temperature is established, and the influence factors of model parameters are studied.The parameters of high temperature compressive strength and shear strength of asphalt mixture under different confining pressures were obtained by triaxial compression test.Under the same temperature and corresponding confining pressure, triaxial dynamic creep tests with different loading levels are carried out, and the rheological times corresponding to the high temperature instability point of the mixture are obtained. The law of FN variation under different confining pressures is analyzed, and a new prediction FN model is established.In addition, the prediction values of FSP with different additives are verified by experiments, and the effects of gradation and temperature on the model parameters are further analyzed.The results show that there is good agreement between the prediction results and the test results at the instability point of asphalt mixture, and the influence of additives on the prediction model parameters will be greatly affected by changing the gradation or test temperature, while the influence of additives can be neglected.When the temperature is 60 鈩，

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