Performance Evaluations of Warm-Mix Reaction-Rejuvenated SBS Modified Asphalt Mixtures Incorporated with Wax-Based Additive

Zihui Liu, Qi Chen, Junwen Pei, Ruiyang Wang (), Weili Shen, Chao Huang, Jialiang Liu and Xiong Xu ()
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Zihui Liu: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430073, China
Qi Chen: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430073, China
Junwen Pei: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430073, China
Ruiyang Wang: Engineering Research Center of Transportation Materials of Ministry of Education, Chang’an University, Xi’an 710064, China
Weili Shen: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430073, China
Chao Huang: School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Jialiang Liu: Anhui Xinlu Construction Group Co., Ltd., Fuyang 236001, China
Xiong Xu: School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430073, China

Sustainability, 2024, vol. 16, issue 12, 1-17

Abstract: The high-performance, cleaner rejuvenation of aged SBS-modified asphalt mixtures (ASBSMAMs) has been a hotspot in asphalt research. Currently, the most popular rejuvenation method still involves hot-mix asphalt with a commonly used oil as the rejuvenator for recycling. However, high-quality, cleaner warm-mix rejuvenation technology for ASBSMAMs is still needed to enrich this field. This study considered adopting a polyurethane (PU) prepolymer and 1,4-butanediol diglycidyl ether (BUDGE) as reactive rejuvenators to achieve warm-mix reaction–rejuvenation to enhance the properties of ASBSMAMs with the use of a wax-based additive, Sasobit. A series of tests were conducted to realize this, including the viscosity–temperature correlation of the rejuvenated binders, as well as tests of the moisture-induced damage, high-temperature stability, low-temperature cracking resistance, and fatigue resistance of the rejuvenated mixtures. The results showed the following: through reaction–rejuvenation, Sasobit could reduce the viscosity of the rejuvenated SBSMA (RSBSMA) below 150 °C for warm mixing and slightly decrease the viscosity–temperature susceptibility; warm-mix reaction–rejuvenation helped to improve the resistance to water-immersion-induced damage and freeze–thaw damage in ASBSMAMs; the addition of Sasobit showed benefits in improving their resistance to permanent deformation, with the dynamic stability values exceeding 5700 pass/mm as more than 1% Sasobit was added; the flexural damage resistance of ASBSMAMs at low temperatures could be enhanced after warm-mix reaction–rejuvenation; and, under reaction–rejuvenation conditions, Sasobit did not reduce the fatigue resistance of the RSBSMAM and, conversely, at limited higher dosages, it worked more effectively. Overall, the studied warm-mix reaction–rejuvenation technology has been proven to be effective for the environmental recycling and reuse of ASBSMAMs at high quality.

Keywords: aged SBS-modified asphalt mixture; Sasobit; warm-mix reaction–rejuvenation; viscosity–temperature correlation; road performance (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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