酸雨侵蚀作用下工业废渣固化铅污染土的工程特性研究
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摘要
以室内制备的铅污染土为研究对象,选用工业废渣(MgO-GGBS)和普通硅酸盐水泥(OPC)为固化剂,评估酸雨侵蚀作用对MgO-GGBS(MGB)固化土和OPC固化土工程特性影响规律。探讨酸雨侵蚀作用下MGB固化土和OPC固化土的强度、渗透、浸出以及微观结构的变化规律。试验结果表明:酸雨侵蚀作用会降低MGB和OPC固化土的工程特性,但相同工况的酸雨侵蚀作用下,MGB固化土的工程特性明显优于OPC固化土,MGB固化土的抗压强度远高于OPC固化土,且MGB固化土的渗透系数和浸出浓度明显低于OPC固化土。扫描电镜结果表明:MGB固化土微观结构受酸雨侵蚀影响程度明显低于OPC固化土,侵蚀后的OPC固化土的水化产物被大量溶蚀,出现较多的侵蚀孔洞,固化土的整体结构被破坏。而MGB固化土被侵蚀的水化产物较少,固化土仍具有较强连接性和较好的完整性。
The industrial waste slag( MGB) and ordinary portland cement( OPC) were used to stabilize/solidify the artificial prepared lead-contaminated soils. The unconfined compressive strength,hydraulic conductivity,leaching test and scanning electron microscope test were used to investigate the effect of acid-rain erosion on engineering properties of lead contaminated soil stabilized/solidified by MGB and OPC. The results showed that the acid-rain could reduce the engineering properties of MGB and OPC solidified soil,while with the same acid-rain effect,the engineering properties of the OPC solidified soil decreased more noticeably relative to those of the MGB solidified soil. The unconfined compressive strength of MGB solidified soil was higher than that of OPC solidified soil,and the hydraulic conductivity and lead concentration changed oppositely. Scanning electron microscope showed that many hydraution products of OPC solidified soil were dissolved and larger void space was formed and the structure was damaged.However,the acid-rain erosion had little influence on MGB solidified soil. The structure of MGB solidified soil was steady.
The industrial waste slag( MGB) and ordinary portland cement( OPC) were used to stabilize/solidify the artificial prepared lead-contaminated soils. The unconfined compressive strength,hydraulic conductivity,leaching test and scanning electron microscope test were used to investigate the effect of acid-rain erosion on engineering properties of lead contaminated soil stabilized/solidified by MGB and OPC. The results showed that the acid-rain could reduce the engineering properties of MGB and OPC solidified soil,while with the same acid-rain effect,the engineering properties of the OPC solidified soil decreased more noticeably relative to those of the MGB solidified soil. The unconfined compressive strength of MGB solidified soil was higher than that of OPC solidified soil,and the hydraulic conductivity and lead concentration changed oppositely. Scanning electron microscope showed that many hydraution products of OPC solidified soil were dissolved and larger void space was formed and the structure was damaged.However,the acid-rain erosion had little influence on MGB solidified soil. The structure of MGB solidified soil was steady.
引文
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[24]JIN F,AL-TABBAA A.Evaluation of Novel Reactive Mg OActivated Slag Binder for the Immobilisation of Lead and Zinc[J].Chemosphere,2014,117:285-294.
[2]张亭亭,李江山,王平.磷酸镁水泥固化铅污染土的应力-应变特性研究[J].岩土力学,2016,37(增刊1):215-224.
[3]DU Y J,WEI M L,REDDY K R.Effect of Acid Rain pH on Leaching Behavior of Cement Stabilized Lead-Contaminated Soil[J].Journal Hazard Materials,2014,271:131-140.
[4]张亭亭,王平,李江山,等.养护龄期和铅含量对磷酸镁水泥固化/稳定化铅污染土的固稳性能影响规律及微观机制[J].岩土力学,2018,39(6):2115-2123.
[5]DU Y J,BO Y L,JIN F,et al.Durability of Reactive MagnesiaActivated Slag-Stabilized Low Plasticity Clay Subjected to DryingWetting Cycle[J].European Journal of Environmental and Civil Engineering,2016,20(2):215-230.
[6]薄煜琳,于博伟,杜延军,等.淋滤条件下GGBS-MgO固化铅污染黏土强度与溶出特性研究[J].岩土力学,2015,36(10):2877-2891,2906.
[7]薄煜琳,杜延军,魏明俐,等.干湿循环对GGBS+Mg O改良黏土强度影响的试验研究[J].岩土工程学报,2013,35(增刊1):134-139.
[8]周俊杰,陈蕾,唐强,等.冻融对固化重金属污染土强度特性的影响[J].南京工业大学学报(自然科学版),2018,40(3):81-87.
[9]查甫生,刘晶晶,许龙,等.水泥固化重金属污染土干湿循环特性试验研究[J].岩土工程学报,2013,35(7):1246-1252.
[10]丁耀堃.酸雨环境下磷酸镁水泥对重金属污染土的固化机理研究[D].杭州:浙江工业大学,2015.
[11]DU Y J,JIANG N J,SHEN S L.Experimental Investigation of Influence of Acid Rain on Leaching and Hydraulic Characteristics of Cement-Based Solidified/Stabilized Lead Contaminated Clay[J].Journal of Hazardous Materials,2012,225:195-201.
[12]章定文,项莲,曹智国.CaO对钙矾石固化/稳定化重金属铅污染土的影响[J].岩土力学,2018,39(1):29-35.
[13]张亭亭,李江山,王平.磷酸镁水泥固化铅污染土的力学特性试验研究及微观机制[J].岩土力学,2016,37(增刊2):279-286.
[14]高宜涛.重金属对水泥固化污染土工程性质影响的试验研究[D].太原:太原理工大学,2016.
[15]ASTM.Standard Method for Accelerated Leach Test for Diffusive Release from Solid:C1308-08[S].ASTM:West Conshohocken,PA,USA,2008.
[16]MONTOUR M R.EPA Method 1312(Synthetic Precipitation Leaching Procedure);Leachate Chemistry Data for Solid Mine Waste Composite Samples from Silverton and Leadville:No.98-624[R].Colorado:US Geological Survey,1998.
[17]中华人民共和国水利部.土工试验方法标准:GB/T 50123-1999[S].北京:中国计划出版社,1999.
[18]HK EPD.Practice Guide for Investigation and Remediation of Contaminated Land,Environmental Protection Department[S].Hong Kong:2011.
[19]WANG P,XUE Q,LI J S,et al.Effects of pH on Leaching Behavior of Compacted Cement Solidified/Stabilized Lead Contaminated Soil[J].Environmental Progress&Sustainable Energy,2016,35(1):149-155.
[20]WEI M L,DU Y J,REDDY K R.Effects of Freeze-Thaw on Characteristics of New KMP Binder Stabilized Zn-and PbContaminated Soils[J].Environmental Science and Pollution Research,2015,22(24):19473-19484.
[21]中华人民共和国环境保护部.危险废弃物鉴别标准浸出毒性鉴别:GB/T 5085.3-2007[S].北京:中国环境科学出版社,2007.
[22]中华人民共和国环境保护部.地表水环境质量标准:GB3838-2002[S].北京:中国环境科学出版社,2002.
[23]PARK M,CHOI C L,SEO Y J.Reactions of Cu and Pb with Mg/Al Layered Double Hydroxide[J].Applied Clay Science,2007,37(1/2):143-148.
[24]JIN F,AL-TABBAA A.Evaluation of Novel Reactive Mg OActivated Slag Binder for the Immobilisation of Lead and Zinc[J].Chemosphere,2014,117:285-294.