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通过沥青混合料空隙率及冻融前后混合料劈裂抗拉强度变化进行冻融循环条件下沥青混合料的耐久性能研究,并采用灰色系统理论中GM(1,N)模型对冻融循环条件下沥青混合料的耐久性能进行预测。试验结果表明:沥青混合料耐久性因素中的空隙率和劈裂抗拉强度与冻融次数之间有良好的相关性,在冻融循环条件下,空隙率随着冻融次数的增加而明显增加,劈裂抗拉强度随着冻融次数增加显著减小。建立的GM(1,N)灰色预测模型能够较好地预测冻融循环条件下沥青混合料的空隙率和劈裂抗拉强度,且计算结果与试验数据吻合较好,表明在冻融循环条件下沥青混合料耐久性研究中引入灰色系统理论是可行的;通过GM(1,N)多因素预测,可以大量减轻试验工作量以及降低试验成本。
The durability of asphalt mixture under freeze-thaw cycle was studied by means of the voidage of asphalt mixture and the splitting tensile strength change of mixture before and after freeze-thaw cycle. The gray system theory GM (1, N) Under the asphalt mixture durability prediction. The experimental results show that there is a good correlation between void fraction and splitting tensile strength and the number of freeze-thaw cycles in the durability of asphalt mixture. Under the freeze-thaw cycles, the void fraction increases with the increase of the number of freeze-thaw cycles Increasing, splitting tensile strength decreases significantly with increasing number of freeze-thaw cycles. The established GM (1, N) gray prediction model can better predict the voidage and splitting tensile strength of asphalt mixture in the freeze-thaw cycles, and the calculated results are in good agreement with the experimental data, indicating that in the freeze-thaw cycle conditions It is feasible to introduce the gray system theory into the durability study of asphalt mixture. By using GM (1, N) multi-factor prediction, the workload of experiment can be greatly reduced and the test cost can be reduced.