SMA混合料级配参数特征研究

Studies on the Characteristics of SMA Mixture Gradation Parameters

为研究SMA混合料在我国推广运用以来的级配变化情况及发展演变趋势,文章收集并分析了我国各地工程所使用的SMA16、SMA13混合料级配,并运用粗集料的粗比值、中位直径、频率直径及颗粒群均匀度等指标,对SMA混合料级配的粗细程度及其粒度均匀性进行分析评价。结果表明:SMA混合料级配逐渐变粗了,而且加大了粗集料中的大骨料用量,提高了SMA高温稳定性,级配均匀性逐渐下降,改善了施工和易性。

To study the gradation changes and evolution trends of SMA mixture since its pro- motion and application in China,this article collected and analyzed the SMA16 and SMA13 mixture gradation used in the engineering all over the country, and used the CA ratio,medi- an diameter, frequency diameter, particle group evenness and other indicators of coarse aggregate to analy-,~e and evaluate the thickness level of SMA mixture gradation and its par- ticle evenness. The results showed that： $MA mixture gradation became gradually coarser, the large aggregate consumption increased in coarse aggregates, the high-temperature stability of SMA was improved, and the grading evenness gradually decreased, which irn- proved the workability.