Preliminary Laboratory Evaluation of Methanol Foamed Warm Mix Asphalt Binders and Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 11
Abstract
The use of warm mix asphalt as an environmentally friendly alternative to hot mix asphalt is quickly building credibility and notoriety. Many technologies are being investigated that allow asphalt to be produced at a lower temperature. One warm mix technology currently being researched is the use of foamed asphalt binder. The foaming process expands the binder temporarily as injected water boils and expands. One limitation of this process is the minimum temperature at which asphalt can be foamed. The objective of this study was to conduct a preliminary study on the performance of methanol foamed asphalt binders and mixtures to reduce production temperature at a high level. According to this, the workability, rutting potential, aging performance, and moisture susceptibility were investigated. The results suggested that the methanol foamed asphalt had visibly better workability than control binder by lowering the mixing temperature by as high as 40°C. However, the rutting potential and moisture susceptibility may be compromised due to the lower aging and weak asphalt-aggregate interaction under low mixing and compaction temperatures. The mass loss results indicated that there was no methanol remaining in the binder after rolling thin film oven (RTFO) aging. Anti-stripping additives were recommended to be used for the methanol foamed asphalt mixtures to improve resistance to moisture damage.
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Acknowledgments
This material is based in part upon work supported by the National Science Foundation (U.S.) under Grant No. 1300286. Any opinions, findings, and conclusions expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 11 • November 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 31, 2016
Accepted: May 25, 2017
Published online: Sep 9, 2017
Published in print: Nov 1, 2017
Discussion open until: Feb 9, 2018
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