grading curve meaning in English

分级曲线
颗粒级配曲线
粒度曲线
粒径分布曲线
粒径曲线

Aggregate grading curve
集料筛分曲线
The latest domestic and foreign achievements on anti - skidding surface of asphalt pavement were collected in this paper , and the major problems on grade design in our country were also thoroughly analyzed . according to systematic analysis on anti - skidding mechanism of asphalt pavement surface , the paper introduced the concept of reference point and forbidden zone of superpave technology to control grade curve " s trends and discussed the influence on pavement surface " s ability of anti - skidding and durability
论文汇集了国内外沥青路面抗滑表层的最新研究成果，深刻剖析了我国现有抗滑表层级配设计的主要问题，在此基础上，通过对沥青路面抗滑机理的系统分析，引入superpave技术的控制点和禁区概念来控制抗滑表层混合料级配曲线的走向，研究了该技术对路面抗滑能力和耐久性的意义。