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Journal of Nanomaterials
Volume 2015, Article ID 926809, 6 pages
http://dx.doi.org/10.1155/2015/926809
Research Article

Thermal Properties of Asphalt Mixtures Modified with Conductive Fillers

1Center for C-Industry Incubation, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong, Daejeon 305-600, Republic of Korea
2Department of Civil Engineering, Kunsan National University, San 68 Miryong-dong, Kunsan, Chollabuk-do 573-701, Republic of Korea
3Department of Civil and Environmental Engineering, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249-0668, USA

Received 29 December 2014; Revised 6 May 2015; Accepted 24 May 2015

Academic Editor: Xuping Sun

Copyright © 2015 Byong Chol Bai et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper investigates the thermal properties of asphalt mixtures modified with conductive fillers used for snow melting and solar harvesting pavements. Two different mixing processes were adopted to mold asphalt mixtures, dry- and wet-mixing, and two conductive fillers were used in this study, graphite and carbon black. The thermal conductivity was compared to investigate the effects of asphalt mixture preparing methods, the quantity, and the distribution of conductive filler on thermal properties. The combination of conductive filler with carbon fiber in asphalt mixture was evaluated. Also, rheological properties of modified asphalt binders with conductive fillers were measured using dynamic shear rheometer and bending beam rheometer at grade-specific temperatures. Based on rheological testing, the conductive fillers improve rutting resistance and decrease thermal cracking resistance. Thermal testing indicated that graphite and carbon black improve the thermal properties of asphalt mixes and the combined conductive fillers are more effective than the single filler.