Frequency and Temperature Interactive Effects on Hot Mix Permanent Deformation Using Response Surface Methodology
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 6
Abstract
Effects of two of the most important factors influencing permanent deformation of styrene–butadiene–styrene (SBS)-modified and unmodified asphalt—frequency and temperature as well as their interactive effects—are studied using dynamic creep test. The authors used a sophisticated experimental design method known as central composite design (CCD) that provides a continuous mathematical equation for the response (permanent deformation, in this study) based on the independent factors as well as their interactions. Using this design method enhances the statistical validation of laboratory results based on the least-required test. Dynamic creep tests were conducted at three levels of temperature (, 17.5, and 40°C) and three levels of loading frequency (0.5, 5.25, and 10 Hz). According to the obtained results, first-order terms of frequency and temperature as well as their interactive term were statistically significant in permanent strain of hot mix asphalt (HMA). Further, it was realized that temperature susceptibility of polymer modified mixture is considerably lower than unmodified mixture at intermediate to high temperatures.
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 17, 2012
Accepted: May 7, 2013
Published online: Jul 12, 2013
Published in print: Jun 1, 2014
Discussion open until: Aug 10, 2014
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