Preparation and Properties of High-Viscosity Modified Asphalt with a Novel Thermoplastic Rubber

Teng Wang, Zhirong Chen, Jinlong Hong, Zhen Liao, Di Wang, Dongdong Yuan, Yufei Zhang () and Augusto Cannone Falchetto ()
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Teng Wang: School of Highway, Chang’an University, South 2nd Ring Road Middle Section, Xi’an 710064, China
Zhirong Chen: School of Highway, Chang’an University, South 2nd Ring Road Middle Section, Xi’an 710064, China
Jinlong Hong: School of Civil Engineering, Chang’an University, South 2nd Ring Road Middle Section, Xi’an 710064, China
Zhen Liao: Guangxi Communications Investment Group Corporation Ltd., Nanning 530022, China
Di Wang: Department of Civil Engineering, Aalto University, 02150 Espoo, Finland
Dongdong Yuan: School of Highway, Chang’an University, South 2nd Ring Road Middle Section, Xi’an 710064, China
Yufei Zhang: School of Highway, Chang’an University, South 2nd Ring Road Middle Section, Xi’an 710064, China
Augusto Cannone Falchetto: Department of Civil Engineering, Aalto University, 02150 Espoo, Finland

Sustainability, 2023, vol. 15, issue 16, 1-19

Abstract: With the increasing demand for improved road performance and sustainable development, modified asphalt is increasingly being used in pavement construction. This study investigates the preparation and properties of a novel high-viscosity modified asphalt. Firstly, different contents of novel thermoplastic rubber (NTPR) were mixed with neat asphalt to prepare high-viscosity modified asphalt (HVA). Then, the basic physical properties containing penetration, a softening point, ductility, and viscosity were conducted. Moreover, the rheological properties of the HVA before and after aging were analyzed via a dynamic shear rheometer test and a bending beam rheometer test. Finally, the dispersity of the modifier in HVA was analyzed via fluorescence microscopy. The results show that adding the NTPR restricts the flow of asphalt to a certain extent and improves the high temperature performance of asphalt. Furthermore, the apparent viscosity of HVA with various contents increases less and is always less than 3 Pa·s. Although adding NTPR makes the asphalt brittle, the HVA can meet the requirements when the NTPR is from 6% to 11%. With the increase in the NTPR, the modifier forms a mesh structure in the asphalt, enhancing its stability. Considering the above results, HVA with 10~11% of NTPR is recommended because it has better comprehensive properties.

Keywords: high-viscosity modified asphalt; basic physical properties; viscosity properties; rheological properties; fluorescence distribution (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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