| Issue |
E3S Web Conf.
Volume 634, 2025
2025 3rd International Forum on Clean Energy Engineering (FCEE2025)
|
|
|---|---|---|
| Article Number | 04001 | |
| Number of page(s) | 12 | |
| Section | Waste Valorization and Resource Management | |
| DOI | https://doi.org/10.1051/e3sconf/202563404001 | |
| Published online | 20 June 2025 | |
Recycling high volume phosphogypsum in highway subgrade: Harmless, testing, and application
China Academy of Transportation Sciences, Engineering Technology and Materials Research enter, 100029 Beijing Chaoyang, China
* Corresponding author: 306876662@qq.com
Based on solidification/stabilization theory, a self-made curing agent was used to stabilize the phosphogypsum, and a high-volume phosphogypsum subgrade filler was prepared. The road performance and pollution characteristics of the stabilized phosphogypsum were analyzed, and applied it to the highway subgrade of the Huiqiao Expressway in Yunnan Province. The results show that (1) moisture content is the key factor affecting the compaction degree of phosphogypsum subgrade filler; (2) after stabilization, the strength and water stability of phosphogypsum are greatly improved; (3) the curing agent reacts with fluorine ion and soluble phosphorus in phosphogypsum to form fluoride precipitation, phosphate precipitation and gel products ( C-S-H, C-A-S-H ) formed by hydration of curing agent to further physical adhesion and encapsulation to achieve fluorine and phosphorus removal; (4)through the application verification of the filling test road, the compaction degree, deflection value, rebound modulus value and pollutant leaching amount all meet the requirements of the specification.
© The Authors, published by EDP Sciences, 2025
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