AC-25C沥青混合料级配优化及应用研究

Study on Gradation Optimization and Application of AC-25C Asphalt Mixtures

文章以湖南省龙永高速公路路面工程项目为依托,以稳定骨架和密实为目的进行了AC-25C的级配优化,拟定3个不同的AC-25型级配,进行马歇尔性能试验及室内路用性能实验分析,同时进行了试铺效果对比。结果表明：优化后的骨架密实级配具有最优的高温稳定性和水稳定性,并且试铺效果很好;增加3~5 mm砂料使得AC-25C混合料的压实和密实质量显著变差,将0~5 mm的石屑按照0~3 mm和3~5 mm分档有利于3~5 mm的用量控制,减少溢料。

Relying on pavement construction project of Hunan Longyong Expressway,and with stable framework and compaction as the purpose,this article conducted AC-25 C gradation optimization,pro-posed three different AC-25 type gradation,and conducted Marshall performance test and indoor pavement performance test analysis,while conducting the contrast of trial paving effect. The results showed that： the skeleton compaction gradation after the optimization has the best high-temperature stability and water stability,with good trial paving effect; the increase of 3 ~5 mm sand materials can make the rolling and compaction quality of AC-25 C mixtures significantly deteriorated,and classifying the 0 ~5 mm stone chips according to 0 ~3 mm and 3 ~5 mm will help the amount control of 3 ~5 mm,re-ducing the material flash.