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- W435012471 abstract "With the recent introduction and acceptance of Superpave design criteria for hot mix asphalt, designers have had difficulty meeting the minimum voids in the mineral aggregate (VMA) requirements. VMA is affected by compactive effort, gradation, and aggregate angularity. This research focused on the effects of fine aggregate angularity on VMA and rutting. Two 12.5-mm Superpave gradations, one coarse and one fine, were developed using 100% crushed limestone. Once the baseline gradations were established, laboratory samples were produced with increasing natural sand percentages. The percentage of natural sand directly replaced the limestone on each sieve allowing the gradation to remain constant and the effect of fine aggregate angularity to be observed independent of gradation. The resultant VMA and fine aggregate angularity of each blend was compared. In an effort to meet Superpave criteria, designers in Kansas have been using chat sand, a flaky fine aggregate of almost pure silica that is a byproduct of lead and zinc mining, to boost VMA. Chat sand was included in this research to further understand the effect of aggregate angularity on VMA and to investigate the effect of chat sand on rutting performance. Samples were made at various chat percentages and VMA was determined and compared to the fine aggregate angularity of the blend. Since meeting the Superpave criteria does not ensure a stable mix, all the samples produced for VMA testing were saved and tested in an Asphalt Pavement Analyzer. The effect of fine aggregate angularity of rounded and flaky fine aggregate on rutting performance was evaluated. The results of this testing indicated that increased fine aggregate angularity results in greater VMA and decreased rutting. Chat sand was shown to be effective at increasing VMA, but increased the potential for rutting the same as the natural sand. Both mixes met Superpave gradation and voids criteria, but the rutting performance of the fine mix was superior to that of the coarse, regardless of fine aggregate angularity. Therefore, it is clear that stability testing is needed to ensure quality mixes." @default.
- W435012471 created "2016-06-24" @default.
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- W435012471 date "2001-05-01" @default.
- W435012471 modified "2023-09-27" @default.
- W435012471 title "EFFECTS OF AGGREGATE ANGULARITY ON VMA AND RUTTING OF KDOT SUPERPAVE LEVEL 1 MIXES" @default.
- W435012471 hasPublicationYear "2001" @default.
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