Performance research and engineering application of high-volume phosphogypsum subgrade filler
In order to explore the feasibility of preparing subgrade filler and filling application with high-volume phosphogyp-sum,the road performance and leaching toxicity test of solidified phosphogypsum subgrade filler were carried out,and the solidification stability mechanism of phosphogypsum was analyzed.The result shows that after curing,the strength and water stability of phospho-gypsum are greatly improved,when the curing agent content is 2％,the 28 d unconfined compressive strength of samples reaches 1.51 Mpa,and the CBR values are 65％,the fluoride ions in the leaching solution of the sample is 0.61～2.00 mg/L,and the total phospho-rus is less than 0.003 mg/L.The fluoride precipitation,phosphate precipitation chemical stabilization method and hydration gel product(C-S-H,C-A-S-H)adhesion package physical curing method are used to achieve fluorine fixation and phosphorus removal.Through the application verification of filling test road,the compaction degree,deflection value,rebound modulus value and pollutant leaching amount of solidified phosphogypsum all meet the requirements of relevant specifications.
road engineeringhigh-volume phosphogypsumsolidification and stabilizationconstruction technologyroad perfor-mancepollution characteristics
万方数据
维普
