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通过集料特性参数测试与马歇尔试验,文章研究了石灰岩、玄武岩2种岩性集料SMA的体积指标,并分析了不同岩性集料沥青混合料体积参数差异的机理。结果表明:在相同级配、油石比与击实功的前提下,玄武岩集料SMA的空隙率、矿料间隙率、粗集料骨架间隙率均大于石灰集料岩SMA。二者体积指标的差异在于两种岩性集料的物理力学特性及击实对沥青混合料级配影响是不同的。
Through the tests of aggregate characteristic parameters and Marshall test, the volume indexes of two kinds of lithology aggregates SMA of limestone and basalt are studied, and the mechanism of the difference of volume parameters of different lithology aggregate asphalt mixtures is analyzed. The results show that under the same grading, the ratio of stone to oil and the compaction work, the void ratio, mineral material void fraction and coarse aggregate void fraction of basalt aggregates are all larger than those of lime aggregate particles. The difference between the two volume indexes is that the physical and mechanical properties of the two lithologic aggregates and the impact of compaction on the gradation of the asphalt mixture are different.