超薄层沥青混凝土SAC-10矿料级配比较试验研究

Comparison testing research on aggregate gradation of ultra-thin layer asphalt concrete SAC-10

针对超薄层沥青混凝土SAC-10,拟定了6条级配曲线,分别采用美国工程兵旋转击实仪(GTM)与标准马歇尔击实进行比较试验,测试试件的力学指标与体积指标,并进行对比分析.试验结果及分析表明:中断级配SAC-10是半开式粗集料断级配,这种半开式级配(含大于4.75 mm颗粒占70%或65%)的特点是油石比的取值范围在4.0%～6.0%,沥青混合料的GTM试验中的GSI和GSF两个指标都符合规定,它的高温抗永久形变能力明显高于完全断级配,可用于超薄罩面层.

The six graded curve are selected for ultra-thin asphalt concrete SAC-10. The comparison testing of GTM (Gyratory Testing Machine) and MARSHALL is completed. The mechanics index and volume index are tested and comparison analysis is completed. The testing result is proved that the middle gap-graded is half-open-gradation, the characteristic of half-open-gradation which the content of bigger than 4.75 mm is 70% and 65% is that the two indexes of GSI and GSF in GTM testing for asphalt concrete are up to the standard when the asphalt to aggregate ratio increases from 4% to 6%, the capability for high-temperature everlasting deformation resistance is better than whole gap-gradation. The half-open-gradation can be used for ultra-thin layer.