超薄沥青混凝土面层配合比设计混合正交分析

针对超薄沥青混凝土厚度小、集料粒径小,同时要求达到传统面层的密实程度、较好的构造深度及其他使用性能的特点,试验采用混合正交方法,选取粉胶比、沥青类型、集料类型、填料类型、粗集料含量等5个关键影响因素,按粉胶比取4个水平、其余各取2个水平的方案进行配合比试验,考察空隙率、马歇尔稳定度、劈裂强度、动稳定度、冻融劈裂强度比(TSR)等5个关键控制指标,对超薄沥青混凝土进行对比分析研究。试验及分析结果表明:当为粉胶比1.3 辉绿岩 SBS改性沥青 水泥 粗集料含量65%的组合时,超薄沥青混凝土的工程性能最好。

Combined Orthogonal Experimental Research on Mixing Ratio Design of Ultra Thin Asphalt Concrete

Aiming at the characteristics which are small thickness,small stone,desired dense as traditional surface,better texture depth and other service performances of ultra thin asphalt concrete,the mixing ratio test of ultra thin asphalt concrete is done with combined orthogonal experimental method.First,five important factors are selected which are ratio of filler to bitumen,the type of asphalt,aggregate and filler and coarse aggregate content,with two levels of each are selected for orthogonal experiment except ratio of filler to bitumen with four levels,then it is studied on the mixing ratio of ultra thin asphalt concrete with considering the air voids,Marshall stability,split strength,dynamic stability and TSR all five key control indexes.Results of tests and analysis show that engineering performance is best while the ratio of filler to bitumen is 1.3,choosing diabase,SBS modified asphalt,cement and coarse aggregate content is 65%.