Effects of fine aggregate angularity on VMA and rutting of Kansas MIA mixtures

被引：2

作者：

Cross, SA ^{[1
]}

Purcell, EM ^{[1
]}

机构：

[1] Univ Kansas, Dept Civil & Environm Engn, Lawrence, KS 66045 USA

来源：

AGGREGATE CONTRIBUTION TO HOT MIX ASPHALT (HMA) PERFORMANCE | 2001年 / 1412卷

关键词：

VMA; aggregate angularity; rutting; Superpave;

D O I：

10.1520/STP10802S

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

With the recent introduction of Superpave, mix designers in Kansas have had difficulty meeting the voids in the mineral aggregate (VMA) requirements. To meet VMA, designers have been importing chat, a flaky fine aggregate of nearly pure chert produced as a by-product from lead and zinc mining, to boost VMA. The objectives of this research were to evaluate the effect of fine aggregate angularity (FAA) on VMA and rutting. Two 12.5-mm Superpave gradations, one coarse and one fine, were developed using 100% crushed limestone. To change the FAA of the mix, the fine aggregate was replaced with natural sand and chat, a byproduct from lead and zinc mining. The resultant VMA and FAA of each blend was compared and samples were tested for rutting. The results indicate that increased FAA results in greater VMA, after exceeding a minimum, and decreased rutting. Chat was shown to be effective at increasing VMA but reduced stability. Meeting Superpave mix requirements did not insure a stable mix.

引用

页码：95 / 109

页数：15