OJCE  Vol.6 No.2 , March 2016
Warm-Mix Asphalt and Pavement Sustainability: A Review
Abstract: Within the past two decades or so, the asphalt paving industry has responded positively to increasing 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, reduced emissions, and potential for increased reclaimed asphalt pavement usage. Growth in utilization 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 asphalt such as lower resistance to fatigue cracking, rutting and potential water-susceptibility problems, particularly with mixes prepared with water-based technologies, which require further research to address.
Cite this paper: Tutu, K. and Tuffour, Y. (2016) Warm-Mix Asphalt and Pavement Sustainability: A Review. Open Journal of Civil Engineering, 6, 84-93. doi: 10.4236/ojce.2016.62008.

[1]   United States Department of Transportation (USDOT) (2006) 2006 Status of the Nation’s Highways, Bridges, and Transit: Conditions and Performance. Federal Highway Administration, Washington DC.

[2]   Federal Highway Administration (FHWA) (2009) Highway Statistics 2007.

[3]   World Commission on Environment and Development (WCED) (1987) Our Common Future: The Report of the World Commission on Environment and Development. World Commission on the Environment and Development, United Nations, New York. Oxford University Press for the Brundtland Commission, Oxford.

[4]   Taylor (2008) as Cited in Sustainable Pavement Course Notes.

[5]   Miller, T. and Bahia, H. (2009) Sustainable Asphalt Pavements: Technologies, Knowledge Gaps and Opportunities. Modified Asphalt Research Center, University of Wisconsin, Madison.

[6]   Willis, J.R. (2014) Sustainable Pavement Course Notes. Auburn University, Auburn.

[7]   Uzarowski, L. and Moore, G. (2008) Sustainable Pavements—Making the Case for Longer Design Lives for Flexible Pavements. Paper Presented at the Pavements: Quantifying Sustainability in Pavement Rehabilitation Projects Session of the 2008 Annual Conference of the Transportation Association of Canada, Toronto.

[8]   National Asphalt Paving Association (NAPA) (2009) Black and Green: Sustainable Asphalt, Now and Tomorrow. Special Report Number 200. National Asphalt Paving Association, Lanham.

[9]   UN Press Release (2014) September 2014 Climate Summit Press Release.

[10]   Brown, E.R., Kandhal, P.S., Roberts, F.L., Kim, Y.R., Lee, D.-Y. and Kennedy, T.W. (2009) Hot Mix Asphalt Materials, Mixture Design, and Construction. 3rd Edition. NAPA Research and Education Foundation, Lanham.

[11]   Asphalt Institute (1983) Principles of Construction of Hot-Mix Asphalt Pavements. Manual Series No. 22, Lexington.

[12]   D’Angelo, J., Harm, E., Bartoszek, J., Baumgardner, G., Corrigan, M., Cowsert, J., Harman, T., Jamshidi, M., Jones, W., Newcomb, D., Prowell, B., Sines, R. and Yeaton, B. (2008) Warm-Mix Asphalt: European Practice. International Technology Scanning Program, Federal Highway Administration. Report No. FHWA-PL-08-007.

[13]   Nicholls, J.C. and James, D. (2013) Literature Review of Lower Temperature Asphalt Systems. Proceedings of the Institution of Civil Engineers—Construction Materials, 166, 276-285.

[14]   Jones, W. (2004) Warm Mix Asphalt Pavements: Technology of the Future? Asphalt: The Magazine of the Asphalt Institute, 19, 8-11.

[15]   Choi, Y. (2007) Warm Mix Asphalt (WMA) Review. Austraroads Technical Report. Austroads Publication No. AP-T91/07.

[16]   European Asphalt Pavement Association (EAPA) (2010) EAPA Position Paper on the Use of Warm Mix Asphalt.

[17]   Croteau, J.-M. and Tessier, B. (2008) Warm Mix Asphalt Paving Technologies: A Road Builder’s Perspective.

[18]   Corrigan, M. (2006) Warm Mix Asphalt Technologies and Research. Federal Highway Administration, last updated 18 August 2006.

[19]   National Asphalt Pavement Association (NAPA) (2013) Third Annual Asphalt Pavement Industry Survey on Recycled Materials and Warm-Mix Asphalt Usage: 2009-2012. Information Series 138.

[20]   Australian Asphalt Pavement Association (AAPA) (2010) Warm Mix Asphalt Validation Project Brochure.

[21]   Naidoo, K., Lewis, T., Nortjè, W., Marais, H. and Rocher, K. (2011) Getting Started with Warm Mix Asphalt in South Africa. 2nd International Warm Mix Conference, Louis, 11-13 October 2011.

[22]   Alderson, A. (2010) Review of the Environmental Aspects of Warm Mix Asphalt. Austroads Publication No. AP-T163/10.

[23]   Perkins, S.W. (2009) Synthesis of Warm-Mix Asphalt Paving Strategies for Use in Montana Highway Construction. Final Project Report. Western Transportation Institute, Montana State University, Bozeman.

[24]   Politano, L. (2012) Warm Mix Asphalt—A Greener Alternative to Hot Mix Asphalt. A Paper Submitted for the Transportation Association of Canada 2012 Technical Excellence Awards (Environmental Achievement Awards).

[25]   Keches, C. and LeBlanc, A. (2007) Reducing Greenhouse Gas Emissions from Asphalt Materials. BSc. Thesis, Worcester Polytechnic Institute, Worcester.

[26]   Ripoll, J.O. and Farré, C.M. (2008) Evaluation of Greenhouse Gas Emissions from the Production of Hot Asphalt Mixtures. Proceedings of the 4th Eurasphalt & Eurobitume Congress, Copenhagen, 21-23 May 2008.

[27]   Anderson, R.M. and May, R. (2008) Engineering Properties, Emissions, and Field Performances of Warm Mix Asphalt Technologies. Interim Report Prepared for National Cooperative Highway Research Program NCHRP 9-47, Asphalt Institute, Lexington.

[28]   West, R., Willis, J.R. and Marasteanu, M. (2013) Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content. National Cooperative Highway Research Program, Report Number NCHRP 752, Project No. 09-46.

[29]   Zaumanis, M. and Mallick, R.B. (2014) Review of Very High-Content Reclaimed Asphalt Use in Plant-Produced Pavements: State of the Art. International Journal of Pavement Engineering, 16, 39-55.

[30]   Olard, D., Le Noan, C. and Romier, A. (2007) Innovative Low Energy Asphalt Technique for Minimizing Impacts from Asphalt Plants to Road Works. Proceedings of 23rd PIARC World Road Congress Paris, Paris, 17-21 September 2007, World Road Association (PIARC).

[31]   Hurley, G.C. and Prowell, B.D. (2006) Evaluation of Evotherm for Use in Warm Mix Asphalt. NCAT Report 06-02, National Center for Asphalt Technology, Auburn.

[32]   Al-Rawashdeh, A.S. (2008) Performance Assessment of Warm Mix Asphalt (WMA) Pavements. MSc Thesis, Russ College of Engineering and Technology of Ohio University, Athens.

[33]   Hurley, G.C., Prowell, B.D. and Kvasnak, A.N. (2009) Ohio Field Trial of Warm Mix Asphalt Technologies: Construction Summary. NCAT Report 09-04.

[34]   Manolis, S., Decoo, T., Lum, P. and Greco, M. (2008) Cold Weather Paving Using Warm Mix Asphalt Technology. Proceedings of 2008 Annual Conference of the Transportation Association of Canada, Toronto, 21-24 September 2008, Polyscience Publications Inc., Laval.

[35]   Nicholls, J.C. (2011) Shell ThiopaveTM Sulphur Extended Asphalt Modifier. Proceedings of 5th International Conference Bituminous Mixtures and Pavements, University of Thessaloniki, Thessaloniki, 1-3 June 2011, 47. World Commission on Environment and Development (WCED) (1987) Our Common Future: The Report of the World Commission on Environment and Development. World Commission on the Environment and Development. United Nations, New York. Oxford University Press for the Brundtland Commission.