冻融侵蚀作用下工业矿渣固化/稳定化铅污染土固化体的工程特性

为了探明冻融侵蚀作用下工业矿渣固化/稳定化铅污染土固化体的工程特性的变化规律,采用高炉矿渣、氧化镁和磷酸二氢钾(简称GPM)对某工业铅污染土固化/稳定化修复,采用室内试验评估了冻融侵蚀作用对工业矿渣铅污染土固化体水力特性、溶出特性和孔隙特性的影响规律,并将普通硅酸盐水泥(简称OPC)做为对比固化剂。结果表明：冻融侵蚀会劣化铅污染土固化体的工程特性,GPM固化体的耐侵蚀能力高于OPC固化体,冻融侵蚀后的GPM固化体的损失量和水力特性均明显好于OPC固化体。溶出试验结果表明：OPC对高含量的铅污染土修复效果极差,且冻融侵蚀前后OPC固化体内Pb溶出浓度均高于5mg/L,而GPM对于高含量的铅污染土修复效果显著,冻融侵蚀前后GPM固化体内Pb溶出浓度均高于0.1mg/L。孔隙试验结果表明,冻融侵蚀会增大铅污染土固化体的孔隙体积,但冻融侵蚀后的GPM固化体的孔隙体积明显小于OPC固化体。GPM铅污染土固化体良好的工程特性和较低的环境风险,具有在重金属铅污染场地推广使用的潜力。

Effect of Cyclic Freezing-Thawing on Engineering Properties of Lead Contaminated Soils Stabilized/Solidified by Industrial Waste Residue

In order to investigated the effect of cyclic freezing-thawing on engineering properties of lead contaminated soils stabilized/solidified by industrial waste residue.Industrial waste residue (GPM) were used to solidify industrial lead contaminated soils. Laboratory test was used to evaluate the effect of cyclic freezing-thawing on hydraulic-mechanical properties,leaching properties and properties of lead contaminated soils stabilized/solidified by industrial waste residue and the ordinary portland cement (OPC) was used to compared.Results showed that the cyclic freezing-thawing had bad effect on engineering properties of solidified soil.GPM solidified soil had higher eroding resistion capacity than that of OPC.The loss rate and hydraulic-mechanical capacity of GPM solidified soil were better than that of OPC solidified soil. Leaching test results showed that the OPC had bad effect on high content lead contaminated soils, The leaching content of OPC solidified soil after cyclic freezing-thawing were of solidified soil above 5 mg/L. GPM had good effect on high content lead contaminated soils, The leaching content of GPM solidified soil after cyclic freezing-thawing were of solidified soil above 0.1 mg/L. Pore structure test results showed that the cyclic freezing-thawing could improved the pore volumes of solidified soils,however the pore volumes of GPM solidified soils were lower than that of OPC solidified soils. The GPM solidified soils had better engineering properties and lower environmental risk.GPM application has great potential in lead contaminated soils.