High-Temperature Characteristics of Polyphosphoric Acid-Modified Asphalt and High-Temperature Performance Prediction Analysis of Its Mixtures

Meiyan Huang, Jianguo Wei, Yuming Zhou (), Ping Li, Jinming Li, Haolong Ju and Song Shi
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Meiyan Huang: School of Traffic and Transportation Engineering, Changsha University of Science and Technology, No. 960 Second Section of Wanjiali South Road, Tianxin District, Changsha 410114, China
Jianguo Wei: School of Traffic and Transportation Engineering, Changsha University of Science and Technology, No. 960 Second Section of Wanjiali South Road, Tianxin District, Changsha 410114, China
Yuming Zhou: School of Traffic and Transportation Engineering, Changsha University of Science and Technology, No. 960 Second Section of Wanjiali South Road, Tianxin District, Changsha 410114, China
Ping Li: School of Traffic and Transportation Engineering, Changsha University of Science and Technology, No. 960 Second Section of Wanjiali South Road, Tianxin District, Changsha 410114, China
Jinming Li: CCCC Infrastructure Maintenance Group Co., Ltd., South Lake East Garden, Chaoyang District, Beijing 100011, China
Haolong Ju: School of Traffic and Transportation Engineering, Changsha University of Science and Technology, No. 960 Second Section of Wanjiali South Road, Tianxin District, Changsha 410114, China
Song Shi: Henan Railway Construction & Investment Group Co., Ltd., No. 11 Yihui Street, Zhengdong New District, Zhengzhou 450003, China

Sustainability, 2024, vol. 16, issue 12, 1-19

Abstract: To promote the application of economical and sustainable polyphosphoric acid (PPA)-modified asphalt in road engineering, styrene-butadiene block copolymer (SBS), styrene-butadiene rubber (SBR), and PPA were used to prepare PPA/SBS and PPA/SBR composite-modified asphalts, which were tested and the data analyzed. Fourier transform infrared spectroscopy (FTIR) tests and thermogravimetric analysis (TG) tests were carried out to study the modification mechanisms of the composite-modified asphalts, and the high-temperature performance of the PPA-modified asphalt and asphalt mixtures was analyzed by dynamic shear rheology (DSR) tests and wheel tracking tests. A gray correlation analysis and a back-propagation (BP) neural network were utilized to construct a prediction model of the high-temperature performance of the asphalt and asphalt mixtures. The test results indicate that PPA chemically interacts with the base asphalt and physically integrates with SBS and SBR. The PPA-modified asphalt has a higher decomposition temperature than the base asphalt, indicating superior thermal stability. As the PPA dosage increases, the G*/sinδ value of the PPA-modified asphalt also increases. In particular, when 0.6% PPA is combined with 2% SBS/SBR, it surpasses the high-temperature performance achieved with 4% SBS/SBR, suggesting that PPA may be a good alternative for polymer modifiers. In addition, the creep recovery of PPA-modified asphalt is influenced by the stress level, and as the stress increases, the R-value decreases, resulting in reduced elastic deformation. Furthermore, the BP neural network model achieved a fit of 0.991 in predicting dynamic stability, with a mean percentage of relative error ( MAPE ) of 6.15% between measured and predicted values. This underscores the feasibility of using BP neural networks in predictive dynamic stability models.

Keywords: polyphosphoric acid; high-temperature performance; multiple stress creep recovery; back propagation neural network; sustainability (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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