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随着改性剂、外掺剂的大量应用,沥青混合料的高温稳定性大幅度提高,由于沥青混合料的高温稳定性对温度是非常敏感的,因此,采用现行规范的试验条件不能有效对此进行评价。文章采用南非MMLS3加速加载试验仪,对两种沥青混合料分别在50、60、65和70℃温度条件下的抗形变能力进行了比对试验,发现当试验温度在60℃时并不能很好评价沥青混合料的抗形变能力,而当试验温度超过60℃时,沥青混合料的抗形变能力急剧下降,表明其抗形变能力对温度很敏感,因此建议在我国南方地区高温多雨地区进行沥青混合料配合比设计时,应增加高温条件下的抗变形能力评价试验。
With the extensive application of modifiers and external admixtures, the high temperature stability of asphalt mixture is greatly improved. Because the high temperature stability of asphalt mixture is very sensitive to temperature, the test conditions of current standard can not be effective This is for evaluation. In this paper, South Africa MMLS3 accelerated loading tester was used to compare the anti-deformation abilities of the two asphalt mixtures at 50, 60, 65 and 70 ℃, respectively, and found that the test temperature was not good at 60 ℃ Evaluate the anti-deformation ability of asphalt mixture, and when the test temperature exceeds 60 ℃, the anti-deformation ability of asphalt mixture drops sharply, indicating that its anti-deformation ability is very sensitive to temperature, so it is recommended in our country in the hot and rainy areas of asphalt mixing Material mix design, should increase the anti-deformation ability under high temperature evaluation test.