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为了深入分析冷再生混合料的级配问题,用美国伊州贝雷法进行冷再生混合料级配设计优化研究,并采用乳化沥青和水泥两种添加剂来改善冷再生混合料性能。通过分析比较旧沥青混合料和经过沥青抽提试验后的旧混合料的筛分结果来确定原始旧混合料用作骨料的级配,再分别选用旧沥青混合料原样筛分和抽提筛分曲线来添加一定比例的新骨料和水泥来配置冷再生混合料的骨架结构,依据修正马歇尔试验确定各冷再生混合料的最佳乳化沥青用量和用水量。分析得出冷再生混合料级配须根据抽提筛分来调整,且其冷再生混合料的最佳乳化沥青和用水量均为3.5%,由此形成优化后的冷再生混合料,并进行冷再生混合料路用性能试验(车辙试验、水稳定性试验、疲劳试验)的测试分析,最后得出按抽提筛分调整级配后的混合料路用性能更好。
In order to further analyze the gradation of cold reclaimed mixture, the design of gradation design of cold reclaimed mixture was carried out by using the American Bayer method, and the emulsified asphalt and cement additives were used to improve the performance of the cold reclaimed mixture. Through the analysis of the old asphalt mixture and after asphalt extraction test of the old mixture screening results to determine the original mixture used as aggregate gradation, and then use the original asphalt mixture as the original screening and extraction sieve Points curve to add a certain proportion of the new aggregate and cement to configure the framework of the structure of cold recycled mixture, according to the revised Marshall test to determine the optimum amount of emulsified asphalt and water for each cold recycled mixture. The analysis shows that the gradation of cold reclaimed mixture should be adjusted according to the extraction and screening, and the optimum emulsified asphalt and water consumption of the reclaimed cold mixture are both 3.5%, thus forming the optimized cold reclaimed mixture and proceeding Cold Recycled Road mix performance test (rutting test, water stability test, fatigue test) of the test analysis, and finally concluded by the extraction and screening of the graded mixture with better road performance.