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陈金洪,张亭亭,王 颖. 硫酸亚铁-碱性工业废渣胶凝材料固化/稳定Cr(Ⅵ)污染土的工程强度特性[J]. 科学技术与工程, 2020, 20(24): 10103-10108.
CHEN Jin-hong,Wang Yin.The Engineering Strength Properties of Chromium Contaminated Soils Stabilized/solidified by Alkaline Industrial Waste Slag and Ferrous Sulfate[J].Science Technology and Engineering,2020,20(24):10103-10108.
硫酸亚铁-碱性工业废渣胶凝材料固化/稳定Cr(Ⅵ)污染土的工程强度特性
The Engineering Strength Properties of Chromium Contaminated Soils Stabilized/solidified by Alkaline Industrial Waste Slag and Ferrous Sulfate
投稿时间:2020-02-16  修订日期:2020-06-08
DOI:
中文关键词:  硫酸亚铁  碱性工业废渣 铬污染土  固化稳定 工程强度特性
英文关键词:alkaline  industrial waste  slag chromium  contaminated soils  stabilized/solidified  engineering strength  properties
基金项目:
        
作者单位
陈金洪 Wuchang Shouyi University,School of Urban Construction
China
张亭亭 中冶南方都市环保工程技术股份有限公司
王 颖 武昌首义学院 城市建设学院
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中文摘要:
      以室内制备的Cr(VI)污染土为研究对象,以硫酸亚铁(FeSO4)为解毒剂,以碱性工业废渣胶凝材料(简称GFC)为固化剂,研究了GFC-FeSO4配比和养护龄期两种参数作用下修复后工程强度特性,并分析了修复后污染土Cr(VI)残留值和矿物成分的变化。结果表明:GFC-FeSO4在Cr(VI)污染土修复领域具有极高的应用前景,GFC-FeSO4既可有效降低污染土Cr(VI)残留值,又可使Cr(VI)污染土达到满足二次利用所需的强度特性。当养护龄期为28 d时,GFC-FeSO4配比为15 %/5 %时,修复后Cr(VI)污染土的工程强度高于我国主干路基层填料强度限值(4.0 MPa),且Cr(VI)残留值低于建设用地土壤(Ⅰ类)筛选值(3.0 mg/kg)。修复后Cr(VI)污染土的变形模量随工程强度的变化呈线性函数变化。GFC-FeSO4修复Cr(VI)污染土机理为生成了CrxFe1-x(OH)3、AFt、C-S-H和C-A-S-H等沉淀。
英文摘要:
      In order to study the engineering strength properties of artificial simulated chromium contaminated soils stabilized/solidified by alkaline industrial waste slag (GFC) and ferrous sulfate (FeSO4). The effect of GFC-FeSO4 ratio and curing age on engineering strength properties,Cr(VI) content and mineral composition were investigated in this paper. Results show that the GFC-FeSO4 had better application potential in Cr(VI) contaminated soils remediation.GFC-FeSO4 could not only reduce the Cr(VI) content, but also enhanced the strength properties,which was accorded with the reuse regulations(4.0 MPa).The unconfined compressive strength was conform with the base filling material regulations of main road and the Cr(VI) content were conform with the risk screening values of first category development land (3.0 mg/kg),when the GFC-FeSO4 ratio was 15 %/5 % and the curing age was 28 d.The deformation modulus increased linearly with compressive strength of Cr(VI) contaminated soils stabilized/solidified by GFC-FeSO4.The mechanism of GFC-FeSO4 stabilized/solidified Cr(VI) contaminated soils was formed precipitate such as CrxFe1-x(OH)3, AFt,C-S-H and C-A-S-H.
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