Effect of Phosphorus Slag Powder on Flammability Properties of Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 11
Abstract
The consequences of asphalt pavement in a long tunnel under fire are much more serious than in open air conditions. Micropowder additives directly affect the characteristics of the asphalt binder, influencing the flammability and mechanical performance of asphalt mixtures. This research is aimed at studying the flammability performance of phosphorus slag (PS) powder as an additive for asphalt modification. Asphalt binders mixed with 0%, 5%, 6%, 8%, and 10% PS powder were produced, and conventional physical tests, rolling thin film oven (RTFO) aging tests, and flammability tests were performed on final samples. The results suggest that a micropowder additive with 8% PS is optimal and allows the modified asphalt to meet technical requirements; while, at the same time, improves the asphalt limiting oxygen index (LOI) by 6.4%–7.0%, indicating that the PS micropowder makes the asphalt more difficult to burn. A cone calorimeter test also shows that the PS additive can reduce the amount of smoke of an asphalt mixture during mixing and paving procedures. The overall results indicate that the PS powder as an additive can greatly improve the flame-retardant characteristics of an asphalt binder.
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Acknowledgments
This research was funded by the National Key Research and Development (R&D) Program of China (Grant No. 2018YFB1600100); the National Natural Science Foundation of China (Grant Nos. 51778071 and 51808058); and the Open Fund (kfj180103) of the National Engineering Laboratory of Highway Maintenance Technology (Changsha Univ. of Science and Technology).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 11 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 13, 2019
Accepted: Jun 10, 2019
Published online: Sep 4, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 4, 2020
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