Open AccessProperties of Solid Waste Mixture-Solidified Cu2+-Contaminated Soil
Author(s) -
Chongxian Suo,
Jiawei Cao,
Hongyu Cao,
Xiao-Qiang Dong
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/769/2/022037
Subject(s) - ettringite , leaching (pedology) , phosphogypsum , calcium silicate hydrate , cement , microstructure , materials science , metallurgy , copper , curing (chemistry) , portland cement , soil water , chemistry , composite material , environmental science , raw material , organic chemistry , soil science
To study the solidification effect of red mud, calcium carbide residue, and phosphogypsum mixture on Cu 2+ -contaminated soil under the soaking condition, the stress-strain, leaching toxicity, and microstructure of solidified soil with cement and mixture were systematically analyzed. The results show that the peak stress of the mixture solidified soil increases with the curing age, and the addition of solid waste is beneficial for the improvement of peak stress. Its leaching concentration of copper ion is not only lower than that of cement solidified soil, but also lower than 0.6mg·L −1 . Besides, the leaching concentration decreased gradually with the curing age. According to the microstructure of solidified soil, it is found that the hydration products of the solidified soil are mainly represented by calcium silicate hydrate/calcium aluminosilicate hydrate and ettringite, which play an important role in the development of the strength and the solidification of copper ions.