Superpave级配范围

根据最大密度曲线理论, 采用轧制碎石料对n为0.35、0.40、0.45、0.50、0.55时的不同级配进行了马氏试验, 确定了沥青混合料最大密度时的n值, 考虑了Superpave关于禁区和控制点的建议, 以及生产实践中允许出现的各档集料用量的变动幅度, 确定了沥青上、中、下面层混合料的级配范围。利用贝雷法的验算和工程实践的检验证明采用所提出的级配范围拌制的沥青混合料基本上达到嵌挤-密实的状态, 既可大大减少渗水, 又具有较高的抗车辙能力。

Gradation scope of Superpave

Based on the maximal density graph theory, Marshall experiments were done with crushed stone when the values of n equal to 0.35, 0.40, 0.45, 0.50 and 0.55. The values of n were ascertained when the asphalt mix density was maximal.After a series of calculation and taking the Superpave's regulations about restricted zone and control points and the wave range of each sieve in engineering experience into account, the gradation scopes of super-layer, mid-layer and under- layer were put forward. The mix manufactured within these gradation scopes is proved having scarf joint-compact state to both reduce penetration, and have good anti-rutting performance by engineering experience and Bailey's method.