Laboratory Testing of Rheological Behavior of Water-Foamed Bitumen
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 8
Abstract
From the rheological behavior of bitumen, one can understand the physical properties of water-foamed bitumen used in warm mix asphalt. Previously, rheological behaviors of water-foamed bitumen such as apparent viscosity, agitation torque, and shear rate have not been well documented. The objectives of this study are as follows: (1) evaluating the accuracy of the cup-and-bob test with a dynamic shear rheometer to investigate the rheological behavior of water-foamed bitumen, (2) analyzing the rheological behavior of water-foamed bitumen at various temperatures, and (3) proposing an optimum water content that decreases the apparent viscosity and required agitation torque of water-foamed bitumen. Bitumen with various water contents (ranging from 0.0 to 3.0% bitumen content by mass) were prepared for rheological testing. The optimum water content at each of these foaming temperatures was determined based on the testing results. This study concludes that the current cup-and-bob test methods accurately describe the rheological behavior of water-foamed bitumen. Within the accepted water content range, the apparent viscosity and required agitation torque of water-foamed bitumen decrease more dramatically as water content increases.
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Acknowledgments
The authors would like to thank the U.S. National Science Foundation (NSF), which established a grant for this research through SusChEM/Collaborative Research program (Award No. 1300286), enabling this study to be completed. 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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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 11, 2017
Accepted: Jan 31, 2018
Published online: May 18, 2018
Published in print: Aug 1, 2018
Discussion open until: Oct 18, 2018
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