Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 241, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.118122
Keywords
Thermosetting polyurethane; Asphalt binder; Bridge deck; Formula; Property
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Funding
- Shaanxi Provincial Communication Construction Group [17-06K]
- National Natural Science Foundation of China (NSFC) [51208043]
- Fundamental Research Funds for the Central Universities of Chang'an University [300102218523]
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High-cost and unsatisfactory flexibility generally reduce the application possibility of epoxy asphalt binders in bridge deck asphalt pavements. To solve these defects, a novel idea that develops a thermosetting polyurethane (TS-PU) modified asphalt binder is put forward in this work. First, the appropriate formula of the TS-PU modified binder is determined via a series of laboratory tests. The comprehensive properties of asphalt binders containing various TS-PU contents are then investigated. Finally, a performance comparison is made between the TS-PU modified binder (with the optimum TS-PU content), styrene-butadienestyrene (SBS) modified binder and epoxy modified binder. Results show that, the addition of TS-PU improves the high temperature and mechanical properties while impairs the low temperature property of base binder. It is also demonstrated in this study that, the TS-PU modified binder is much better in high temperature rutting resistance and tensile strength than SBS modified binder; meanwhile, the TS-PU modified binder, on the whole, has an advantage over epoxy modified binder in flexibility and cost saving, showing a favorable application prospect in bridge deck pavements. (C) 2020 Elsevier Ltd. All rights reserved.
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