关于CBR-V矿料级配设计方法中“最大内摩阻力”取值的试验研究

Experimental study on the value of"maximum internal friction"in CBR-V aggregate gradation design method

CBR-V矿料级配设计方法骨架部分是通过“最大内摩阻力”确定最优合成级配的,因此合理而科学地确定“最大内摩阻力”成为级配设计是否可行的关键。所谓集料级配,是指集料中不同粒料间的相互搭配关系,路用矿质集料的级配一般应满足下列基本要求:最大的内摩阻力和一定的孔隙率。该定义明确了级配合成的方法和目的,但忽略了实现的过程—拌和、摊铺和碾压。在试验研究的基础上,通过总结提炼,考虑集料级配实现过程中的拌和、摊铺和碾压等因素,认为一味追求“最大内摩阻力”是不合适的,应先考虑施工过程中的和易性,在此基础上,追求集料级配中的最大内摩阻力。根据该原则提出了CBR-V矿料级配设计方法骨架设计部分掺配时“最大内摩阻力”的取用方法及范围。

The skeleton part of CBR-V aggregate gradation design method is to determine the optimal composite gradation by"maximum internal friction",so reasonable and scientific determination of"maximum internal friction"becomes the key to the feasibility of gradation design.The so-called aggregate gradation refers to the matching relationship between different particle sizes in aggregate.The gradation of road mineral aggregate should generally meet the following basic requirements as maximum internal friction and certain porosity.The definition defines the method and purpose of grading synthesis,but ignores the realization process of mixing,paving and rolling.On the basis of experimental research,in this paper,it has been considered not appropriate to blindly pursue the"maximum internal friction"by summing up and refining,considering the factors of mixing,paving and rolling in the process of aggregate gradation.It should firstly consider the workability in the construction process,and on this basis,seek the maximum internal friction in aggregate gradation.Finally,according to the principle,the range of"maximum internal friction"of CBR-V mineral aggregate gradation design method has been proposed.