The Performance and Distribution of Polyurethane-Modified Asphalt That Exhibits Different Molecular Weights

Xiaoyi Ban, Zengping Zhang (), Pengtao Chang, Suyu Zhang, Hao Liu, Yuzi Liang and Yujing Chen
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Xiaoyi Ban: Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, China
Zengping Zhang: Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, China
Pengtao Chang: Power China Urban Planning & Design Institute Co., Ltd., Guangzhou 511466, China
Suyu Zhang: Chang’an Dublin International College of Transportation at Chang’an University, Xi’an 710061, China
Hao Liu: Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, China
Yuzi Liang: Chang’an Dublin International College of Transportation at Chang’an University, Xi’an 710061, China
Yujing Chen: Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, China

Sustainability, 2023, vol. 15, issue 8, 1-18

Abstract: To analyze the effect of polyol on polyurethane (PU)-modified asphalt, three different soft segments of polyurethane were synthesized, and we utilized the reaction of MDI (diphenylmethane diisocyanate) with PU650, PU1000, and PU1400. With respect to molecular weight, the effect of polyol on the performance of modified asphalt was analyzed, and the asphalt was modified by using three different polyurethanes. To analyze the PU samples, the Fourier transform infrared spectroscopy (FTIR) tests and gel permeation chromatography (GPC) tests were selected; by contrast, to analyze the rheological properties and modification mechanism of asphalt, the dynamic rheology test (DSR), low-temperature bending creep test (BBR), multi-stress repetitive creep test (MSCR), FTIR, and differential scanning calorimetry (DSC) were selected. The results indicate that the molecular weight of polyol affects the molecular structure of polyurethane, the distribution of soft and hard segments, the content of soft segments, and the distribution of asphaltene in asphalt; thus, the asphalt modification effect occurs differently. The storage stability and high-temperature stability of the polyurethane-modified asphalts that were synthesized using three different polyols (i.e., polyols that exhibit different molecular weights) did not differ considerably, and the PU1400-modified asphalt exhibited the best low-temperature performance.

Keywords: molecular weight; polyol; polyurethane; modified asphalt; rheological properties; modification mechanism (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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