Author
Listed:
- Chenyang Dong
(China State Construction Railway Investment and Engineering Group Co., Ltd., Beijing 100029, China
China Construction Third Engineering Bureau Group Co., Ltd., Wuhan 430014, China)
- Hui Xiang
(China State Construction Railway Investment and Engineering Group Co., Ltd., Beijing 100029, China
China Construction Third Engineering Bureau Group Co., Ltd., Wuhan 430014, China)
- Xiaodi Hu
(School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China)
- Hao Wu
(China State Construction Railway Investment and Engineering Group Co., Ltd., Beijing 100029, China
China Construction Third Engineering Bureau Group Co., Ltd., Wuhan 430014, China)
- Bo Gao
(China State Construction Railway Investment and Engineering Group Co., Ltd., Beijing 100029, China
China Construction Third Engineering Bureau Group Co., Ltd., Wuhan 430014, China)
- Jiuming Wan
(School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China)
- Zhengmengyuan Rao
(School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China)
- Zhiwei Fan
(School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan 430074, China)
- Yuan Ma
(China State Construction Railway Investment and Engineering Group Co., Ltd., Beijing 100029, China
China Construction Third Engineering Bureau Group Co., Ltd., Wuhan 430014, China)
Abstract
Phosphogypsum is a waste from the phosphorus chemical industry which has certain environmental hazards. Using it as a substitute for building materials was thought to alleviate the problems of phosphogypsum pollution and natural mineral consumption. This study tried to develop an environmentally friendly phosphogypsum-based composite filler (PCF) that can be used as a filler in the SMA-13 asphalt mixture. The SMA-13 asphalt mixture was first designed, following which PCF containing phosphogypsum and steel slag powder was prepared. PCF’s composition and harmless treatment were determined based on the characterization of the overflowed concentration of fluoride ions, and the pH value of the PCF’s leaching solution was evaluated by ion chromatography and a pH meter. The effect of replacing the PCF content in the SMA-13 asphalt mixture was investigated according to high-temperature performance, moisture resistance, and low-temperature performance. Long-term overflowed harmful ion concentrations of PCF-based SMA-13 asphalt mixtures were also included. The results indicate that the steel slag powder content can reduce the overflowed fluoride ion concentration in phosphogypsum. The optimal composition of PCF was 65% phosphogypsum and 35% steel slag powder. The addition of PCF can enhance the SMA-13 asphalt mixture’s Marshall stability and dynamic stability when its content is over 20%. SMA-13 asphalt mixtures with PCF can meet the requirements of the specification, although their moisture resistance is reduced by PCF. PCF was proven to increase fracture toughness and energy in a semi-circular bending test at low temperatures, while 40% PCF showed the highest cracking resistance. Furthermore, PCF was able to reduce the long-term overflowed concentrations of fluoride ions and phosphate ions that could meet the environmental requirements. The results of this study provide academic support for the effective consumption of phosphogypsum in road engineering on a large scale.
Suggested Citation
Chenyang Dong & Hui Xiang & Xiaodi Hu & Hao Wu & Bo Gao & Jiuming Wan & Zhengmengyuan Rao & Zhiwei Fan & Yuan Ma, 2024.
"Evaluation of the Influence of Phosphogypsum-Based Composite Filler on Performance of the SMA-13 Asphalt Mixture and Its Harmless Treatment,"
Sustainability, MDPI, vol. 16(15), pages 1-18, August.
Handle:
RePEc:gam:jsusta:v:16:y:2024:i:15:p:6613-:d:1448476
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