SMA骨架标准研究
Study on the Criterion of SMA Framework
-
摘要: 传统观点认为,粗集料的干插捣间隙率VDRC大于压实混合料中粗集料间隙率VMix是SMA骨架结构形成 的标准,但是VDRC与VMix在压实方法、测量精度、换算密度指标等方面存在系统误差,导致VDRC在多数情况下都 大于VMix,失去了优选级配的作用。试验及结果分析表明,用体积法测量的毛体积密度换算的VMix较合理,用 VMix随细集料增加的突变点判定骨架形成是可行的。
-
关键词:
- 试验 /
- 系统误差 /
- 沥青玛蹄脂碎石混合料(SMA) /
- 粗集料间隙率
Abstract: Fromthe traditional pointof view, the criterion of framework forSMA(stone matrix asphalt) mix is thatVDRC(the voids in coarse aggregate on the dry rodded condition) must be larger thanVMix(the voids in coarse aggregate of mix). However, there are several facets, such as the compaction method, the measuring precision, and the density conversion for calculating the voids in coarse aggregate, which could cause system errors. Consequently inmany casesVDRCis always largerthanVMix, and the optimal gradation can not be realized. The test results showthat theVMixwhich is calculated with the bulk density measured by calipers is fairly reasonable. There is a turning point in the curve for theVMixversus the percentage of the fine aggregate passing the 4.75 mm sieve. It is feasible to use this turning point to evaluate the formation of coarse aggregate skeleton in a SMAmix.-
Key words:
- tests /
- system errors /
- stone matrix asphalt /
- voids in coarse aggregate
点击查看大图
计量
- 文章访问数: 1794
- HTML全文浏览量: 57
- PDF下载量: 146
- 被引次数: 0