Characteristics of Latex-Modified Bitumen Prepared via Foaming Technique Using Water and Diluted Methanol
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
The ability of latex to notably improve the performance of asphalt pavements has established the material as a favorable modifier in asphalt systems. However, the high viscosity of latex-modified asphalt (LMA) binders significantly increases the production temperature of asphalt mixtures. One effective way to resolve this problem is by employing foaming technology, which was investigated in this study. Diluted methanol was used as a foaming agent due to its lower boiling point and energy consumption compared with water. Asphalt binder of penetration grade was utilized as the binding agent. Latex accounted for 6% of the total weight of the asphalt binder. In this study, 1% water and 3% diluted methanol were added as foaming agents. The basic and rheological properties of asphalt binders were examined via different tests, for example, softening point, decay curves, rotational viscosity, torsional recovery, and dynamic shear rheometer. The findings showed that the presence of latex contributed to higher softening point, viscosity, elastic property, and rutting resistance to improve the pavement durability. The foaming agents (water or diluted methanol) decreased the viscosity and improved the expansion ratio producing better workability and aggregate coating during mixture production.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors recognize the financial assistance provided by the National Natural Science Foundation of China (NSFC) via the Research Fund for the International Young Scientist (Grant No. 51750110491). The assistance provided by Changán University, Xian, China is much appreciated. Appreciation is given to all the technical staff of the Highway Engineering Laboratory, Universiti Sains Malaysia (USM) for unceasing assistance and support.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 21, 2020
Accepted: Dec 10, 2020
Published online: May 4, 2021
Published in print: Jul 1, 2021
Discussion open until: Oct 4, 2021
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