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Erschienen in:
2022 | OriginalPaper | Buchkapitel
A Study on the Properties of Polyurethane-Elastomer-Modified Asphalt
verfasst von : Peng Wang, Jian Xu, Yongchun Qin, Erhu Yan, Jie Wang, Weiying Wang
Erschienen in: Proceedings of the RILEM International Symposium on Bituminous Materials
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Abstract
A new type of elastomer-modified asphalt, polyurethane (PU)-elastomer-modified asphalt, was synthesized with polytetramethylene ether glycol (PTMEG) and diphenylmethane diisocyanate (MDI) as the main agents. The R value (–NCO/–OH) was 1.15. The polyurethane-elastomer-modified asphalt was prepared by adding different amounts of a polyurethane elastomer modifier to the asphalt using a high-speed emulsification shearing machine, and the properties of modified asphalt were characterized. The experimental results indicate that the performance of polyurethane-elastomer-modified asphalt has been significantly improved. Fluorescence microscopy indicated that the modifier could disperse well in asphalt. The dynamic shear rheological test (DSR), the ductility test and the multiple stress creep recovery test (MSCR) were used to analyze the asphalt samples. The results indicate that the high- and low-temperature performance of the asphalt was significantly improved.