聚酯纤维沥青混合料级配设计的理论方法

应用分形理论,推导出聚酯纤维沥青混合料粗、细集料级配设计的数学模型。根据颗粒填充特性,计算出粗、细集料各级筛孔的理论通过率。将粗、细集料分别看作一个整体对其级配进行设计,在保持集料总比表面积基本不变的情况下,建立在实际设计中粗集料级配调整设计的数学模型。根据数学公式,得出3种不同的设计级配。结果表明,粗集料占74%,细集料占15.2%,填料占10.8%;对于掺量为0.2%的聚酯纤维沥青混合料而言,级配1和级配2的体积参数不满足规范要求,级配3的体积参数均满足规范要求,是最优级配组成。

Theoretical Method of Aggregate Grading Design of Asphalt Mixture with Polyester Fiber

Applying the fractal theory,the math models of coarse and fine aggregate grading design for asphalt mixture with polyester fiber were presented.According the packing theory and through the analysis of packing characteristics of aggregate,the sieve ratio of coarse and fine aggregate for aggregate of asphalt mixture were calculated.The coarse and fine aggregates were studied respectively to determine the aggregate percentage and design gradation.With the same specific surface area for the same asphalt aggregate ratio,the formulae of coarse aggregate adjustable gradation design were investigated.Three groups of the mineral gradation of asphalt mixture were gotten from these equations.Results show that(1) the coarse aggregate is 74%,the fine aggregate is 15.2% and the filler is 10.8%;(2) for the asphalt mixture with 0.2% polyester fiber,the volume parameters of gradation No.1 and gradation No.2 cannot meet the requirements of technical specification;the volume parameters,flow value and dynamic stability of gradation No.3 all meet the requirements of technical specification.The gradation No.3 is the optimum gradation.