摘要：The curing agent of cement, fly ash and desulphurized gypsum (CFG) was used to solidify lead- contaminated soils. Based on orthogonal test, accelerated Carbonation and unconfined compressive strength test and SEM test were conducted to investigate the variation of the mechanical strength and microstructure of treated lead-contaminated soils with Carbonation time, lead ion concentration and CFG dosage content. Results were showed that the unconfined compressive strength of the solidified contaminated soils increased with CFG dosage, and reduced with lead ion concentration. At 28-day, when the lead ion concentration were 1000mg/kg and 5000mg/kg, the strength of carbonation specimen reduced with lead ion concentration increasing. When 15000mg/kg, the strength of carbonation specimen was increased between 24-hour to 48- hour, and then decreased after 72-hour. The carbonation specimen decreases the pH value, and the strength is increased due to the formation of Calcium carbonate.
