Effects of Lime Content on Moisture Susceptibility of Rubberized Stone Matrix Asphalt Mixtures Using Warm Mix Additives in Terms of Statistical Analysis
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 12
Abstract
The present study is focused on evaluating the effect of hydrated lime content on the moisture susceptibility of polymerized stone matrix asphalt (SMA) mixtures by using moist aggregates and three different warm-mix asphalt (WMA) additives. Indirect tensile strength (ITS), tensile strength ratio (TSR), deformation, and toughness were tested to determine the moisture sensitivity of these mixtures. The experimental design included aggregate moisture content ( by weight of dry mass of the aggregate), two aggregate sources (B and C), two hydrated lime contents (1% and 2% by weight of aggregate), three WMA additives (Asphamin, Sasobit, and Evotherm) along with control mixture, and four different types of binders [i.e., PG 64-22 + 10% crumb rubber (CR) (minus #40 mesh), PG 64-22 + 15% CR, PG 64-22 + 20% CR, and PG 76-22 + fibers] were used in this study. A total of 256 samples were utilized for the ITS testing. In general, except for the mixture with 10% CR using Evotherm, all other mixtures containing WMA additives met the minimum wet ITS requirement of 448 kPa as per South Carolina DOT (SCDOT) specifications. Test results indicated that 24 mixtures failed to meet the minimum TSR requirement of 85%. Test results showed that by increasing the lime content to 2%, a majority of the mixtures containing WMA showed improvement in the TSR values.
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Acknowledgments
Financial support was possible through a grant from South Carolina Department of Health and Environment Control (DHEC) and the Asphalt Rubber Technology Service (ARTS) of Clemson University. The authors wish to thank all the undergraduate students for their support during sample preparation and testing.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 12 • December 2012
Pages: 1431 - 1440
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jan 1, 2011
Accepted: Mar 23, 2012
Published online: Mar 27, 2012
Published in print: Dec 1, 2012
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