Asphalt Mixture CTE Measurement and the Determination of Factors Affecting CTE
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 6
Abstract
The coefficient of thermal contraction or expansion (CTE) of asphalt mixtures is a property that describes how asphalt mixtures respond to thermal loading during cooling or heating. The CTE is an important mixture property used as an input parameter in the thermal cracking model of the AASHTO Mechanistic Empirical Pavement Design Guide software. CTE measurement has proven quite a challenging task; however, many researchers have developed various methods for measurement using linear variable differential transducers (LDVTs), which have proven robust and suitable for routine tests. In this paper, a laboratory test method was devised using LVDTs to measure the CTE and determine the asphalt mixture properties affecting the CTE. The mixture properties investigated in this study included binder grade, binder content, the presence of recycled asphalt pavement (RAP) and recycled asphalt shingles (RASs), compaction effort, aggregate CTE, and size and aging. Mixture properties such as binder grade, binder content, aging, and the inclusion of recycled materials (RAP and RAS) resulted in a significant change in the CTE and the glass transition temperature () of mixtures.
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Acknowledgments
The authors would like to thank the Ohio Department of Transportation (ODOT) and the Federal Highway Administration (FHWA) for funding this study. The authors also wish to extend their gratitude to all ODOT engineers and contractors who provided all forms of assistance in the preparation of this manuscript.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 14, 2016
Accepted: Sep 29, 2016
Published online: Jan 27, 2017
Published in print: Jun 1, 2017
Discussion open until: Jun 27, 2017
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