Recycling high volume phosphogypsum in highway subgrade: Harmless, testing, and application
Year: 2025
Type: conference-paper
Abstract: 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.
Source: E3S Web of Conferences
Authors: Jun Shen, Yin Cheng, Lin Li, Xuexin Liu, Dongbo Zou, Chaoyue Yuan
Institution: China Academy of Transportation Sciences
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4411498680