Open Journal of Civil Engineering, 2016, 6, 84-93 Published Online March 2016 in SciRes. http://www.scirp.org/journal/ojce http://dx.doi.org/10.4236/ojce.2016.62008 How to cite this paper: Tutu, K.A. and Tuffour, Y.A. (2016) Warm-Mix Asphalt and Pavement Sustainability: A Review. Open Journal of Civil Engineering, 6, 84-93. http://dx.doi.org/10.4236/ojce.2016.62008 Warm-Mix Asphalt and Pavement Sustainability: A Review Kenneth A. Tutu 1 , Yaw A. Tuffour 2 1 Department of Civil Engineering, Auburn University, Auburn, AL, USA 2 Department of Civil Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana Received 10 December 2015; accepted 6 March 2016; published 9 March 2016 Copyright © 2016 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract Within the past two decades or so, the asphalt paving industry has responded positively to in- creasing global concerns over shrinking natural resource reserves and worsening environmental conditions through the development and deployment of warm-mix asphalt technologies. Such technologies make it possible to produce and place asphalt concrete at reduced temperatures compared to conventional hot-mix methods. Several studies have reported on the potential of warm-mix asphalt with regard to improved pavement performance, efficiency and environmental stewardship. This paper reviews several of those studies in the context of pavement sustainability. Overall, warm-mix asphalt provides substantial sustainability benefits similar to or, in some cases, better than conventional hot-mix asphalt. Sustainability benefits include lower energy use, re- duced emissions, and potential for increased reclaimed asphalt pavement usage. Growth in utili- zation of warm-mix asphalt worldwide may, in the not-too-distant future, make the material the standard for asphalt paving. Regardless, there are concerns over some aspects of warm-mix as- phalt such as lower resistance to fatigue cracking, rutting and potential water-susceptibility prob- lems, particularly with mixes prepared with water-based technologies, which require further re- search to address. Keywords Warm-Mix Asphalt, Pavement Sustainability, Lower Energy Use, Reduced Emissions 1. Introduction Global concerns over the gradual depletion of non-renewable natural resources and increasing damage to the environment from greenhouse gas emissions have created greater awareness, within the past two decades, for sustainable development practices in all spheres of human endeavor including the road construction industry.
Warm-Mix Asphalt and Pavement Sustainability: A Review
Apr 26, 2023
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