title: Effect of drying-wetting cycles on leaching behavior of cement solidified lead-contaminated soil.
abstract: Lead contaminated soil was treated by different concentration of ordinary Portland cement (OPC). Solidified cylindrical samples were dried at 40°C in oven for 48 h subsequent to 24h of immersing in different solution for one drying-wetting. 10 cycles were conducted on specimens. The changes in mass loss of specimens, as well as leaching concentration and pH of filtered leachates were studied after each cycle. Results indicated that drying-wetting cycles could accelerate the leaching and deterioration of solidified specimens. The cumulative leached lead with acetic acid (pH=2.88) in this study was 109, 83 and 71 mg respectively for solidified specimens of cement-to-dry soil (C/Sd) ratios 0.2, 0.3 and 0.4, compared to 37, 30, and 25mg for a semi-dynamic leaching test. With the increase of cycle times, the cumulative mass loss of specimens increased linearly, but pH of filtered leachates decreased. The leachability and deterioration of solidified specimens increased with acidity of solution. Increases of C/Sd clearly reduced the leachability and deterioration behavior.
authors.affiliation: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei, China.
authors.forename: Jiang-Shan
authors.initials: JS
authors.lastname: Li
authors.affiliation: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei, China. Electronic address: qiangx@whrsm.ac.cn.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xue
authors.affiliation: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei, China.
authors.forename: Zhen-Ze
authors.initials: ZZ
authors.lastname: Li
authors.affiliation: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Liu
mesh_terms: D002681:China; D003252:Construction Materials; D003890:Desiccation; D052918:Environmental Restoration and Remediation; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis*; D044367:Phase Transition; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D012996:Solutions; D018505:Waste Management; D014874:Water Pollutants, Chemical / Q000032:analysis*; D017155:Wettability
chemical_list: D012987:Soil; D012989:Soil Pollutants; D012996:Solutions; D014874:Water Pollutants, Chemical; D007854:Lead
keywords: Contaminated soil; Drying-wetting cycles; Leaching; Solidification/stabilization