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对于SMA混合料,准确地设计矿料级配非常必要。因为其路用性能,尤其是抗车辙能力,主要归功于混合料中粗集料所形成的石-石嵌挤结构。该文论述了一种基于贝雷法的SMA配合比设计过程,研究了16种不同的沥青混合料,包括6个矿料级配和3个沥青用量。通过对成型试件的体积参数进行分析,发现粗集料用量对VCA和VMA两个指标影响较大。当粗集料的设计密度为干捣实密度的95%~105%时,粗集料可以形成很好的石-石嵌挤结构。试验结果表明,SMA混合料具有较好的抗车辙能力;同时车辙试验的动稳定度和蠕变试验的变形应变之间存在密切的联系。
For SMA mixes, it is imperative to accurately design the aggregate gradation. Because of its road performance, especially the ability to resist rutting, mainly due to the mixture of coarse aggregate formed by stone-stone embedded crowded structure. This article discusses a Bayer process-based SMA mix design process in which 16 different bitumen mixes were studied, including 6 ore grade and 3 bitumen levels. Through the analysis of the volume parameters of the formed specimen, it is found that the amount of coarse aggregate has a great influence on the two indexes of VCA and VMA. When the design density of the coarse aggregate is between 95% and 105% of the dry tap density, the coarse aggregate can form a good stone-stone intrusion structure. The test results show that the SMA mixture has better anti-rutting ability; at the same time, there is a close relationship between the dynamic stability of the rutting test and the deformation strain of the creep test.