基于主亚骨架的ATB-25混合料级配研究

The ATB-25 Mixture Gradation Research Based on the Main Sub-frame

基于贝雷法的设计理论,对ATB-25矿料级配范围内的级配曲线进行分析,得出了在混合料中,由13.2～31.5mm粒径的颗粒形成混和料的主骨架,4.75～13.2mm粒径的颗粒形成混合料的亚骨架,在进行混合料设计时,4.75mm的通过率应控制在30%以下,13.2mm的通过率控制在55%以下。通过对矿料级配贝雷法参数的计算,确定了矿料级配CA比范围一般为0.4～0.6之间,FAc和FAf的范围分别为0.4～0.6和0.3～0.6。结合重庆绕城高速公路项目,比较了ATB-25、AC-25、ATB-25#及AC-25#混合料的路用性能,表明按照该标准控制的混合料的抗水损害能力相近,但是ATB-25高温稳定性相对较好。

The gradation curve of the ATB-25 mineral aggregate was analyzed based on the design theory of Bailey. The main skeleton of mixed material was made from the particles of the 13.2-31.5 mm size, and the mild skeleton was formed of 4.75-13.2 mm size in the mixture. The pass rate of 4.75 mm particles should be controlled below 30%, and the rate of 13.2 mm particles was controlled 55% less during the mixture design. The CA ratio range of aggregate gradation was generally determined between 0.4 and 0.6, and the ranges for FAc and FAf respectively were distributed into 0.4-0.6 and 0.3-0.6 by Bailey method parameters calculations of aggregate gradation. The pavement performance of the ATB-25, AC-25, ATB-25# and AC-25# were respectively in the Chongqing highway project. The water damage ability of the two mixtures was roughly the same, but for the high temperature stability the former was getter according to the standard.