采用均匀试验设计研究了机制砂关键筛孔对沥青混合料空隙率的影响,得出了空隙率与关键筛孔的回归方程,优化了机制砂关键筛孔(0.075、0.6和2.36mm)的通过率范围。根据优化后关键筛孔的通过率范围对现行规范中的机制砂级配曲线进行优化,通过路用性能试验对优化后级配范围进行验证,结果表明优化后的机制砂级配范围是合理的。 The influence of the key sieve openings of the synthetic sand on the voidage of asphalt mixture was studied by the uniform design. The regression equation between the voidage and the critical sieve openings was obtained and the key sieve holes (0.075, 0.6 and 2.36mm) Rate range. According to the pass rate range of the key sieve after optimization, the grading curve of mechanism sand in current code is optimized, and the optimized grading range is verified by the road performance test. The results show that the optimized range of sand grading is reasonable .