CAJ | 학술논문

为评估一种自主开发的固化剂(GSS-02)对土壤中重金属的稳定作用,探讨该固化剂用于河岸固化护坡工程的可行性,在实验室内分别采用普通硅酸盐水泥(OPC)和GSS-02对土壤实施固化处理.用US EPA的TCLP方法测定浸出毒性,评估添加剂对土壤Cu、Zn、Cr和Ni的稳定效果,测定固化体的无侧限抗压强度,初步评估土壤固化体的物理性能.结果表明,加入OPC或GSS-02在一定程度上提高了土壤浸出液的pH值,固化剂添加量与浸出液pH值存在显著的正相关关系;OPC和GSS-02对Cu、Zn和Ni有较好的稳定作用,能使浸出液中重金属浓度降低为对照样品的1/3～1/7,但能够活化Cr;加入OPC或GSS-02能提高固化体的无侧限抗压强度,与OPC相比,低剂量时GSS-02能显著提高无侧限抗压强度,而高剂量时则相反,这有利于土壤生物工程的实施.上海市南汇区某河岸固化工程应用表明,GSS-02能满足土壤重金属稳定和土壤生物生长恢复的需要,与OPC相比是一种良好的生态型同化剂.
위평고일충자주개발적고화제(GSS-02)대토양중중금속적은정작용,탐토해고화제용우하안고화호파공정적가행성,재실험실내분별채용보통규산염수니(OPC)화GSS-02대토양실시고화처리.용US EPA적TCLP방법측정침출독성,평고첨가제대토양Cu、Zn、Cr화Ni적은정효과,측정고화체적무측한항압강도,초보평고토양고화체적물이성능.결과표명,가입OPC혹GSS-02재일정정도상제고료토양침출액적pH치,고화제첨가량여침출액pH치존재현저적정상관관계;OPC화GSS-02대Cu、Zn화Ni유교호적은정작용,능사침출액중중금속농도강저위대조양품적1/3～1/7,단능구활화Cr;가입OPC혹GSS-02능제고고화체적무측한항압강도,여OPC상비,저제량시GSS-02능현저제고무측한항압강도,이고제량시칙상반,저유리우토양생물공정적실시.상해시남회구모하안고화공정응용표명,GSS-02능만족토양중금속은정화토양생물생장회복적수요,여OPC상비시일충량호적생태형동화제.
The present study aimed to evaluate the stabilization of soil heavy metals by a self-developed binder named GSS-02 which would become a standard for the implementation of riverbank solidification engineering. Ordinary Portland cement (OPC) and GSS-02 were mixed with soil samples at various ratios and the efficiency of stabilization of Cu, Zn, Cr and Ni in soils was evaluated by the US EPA TCLP toxicity test. The unconfined compressive strength of the solidified soil was also measured to estimate its physical properties. Addition of OPC or GSS-02 increased the pH value of the leachate up to a maximum of 7.0 and there was a clear positive relationship between the amount added and the leachate pH value. OPC or GSS-02 had a positive effect on stabilization of Cu, Zn and Ni in soils thereby decreasing their concentrations in the leachate by 3~7 fold and simultaneously activated Cr. Both additives increased the compressive strength of the solidified body. When the additive ratio was less than 10% the compressive strength of the solidified body treated with GSS-02 was greater than that with OPC treat-ment. The opposite effect was observed when the additive ratio was increased, resulting in conditions favorable for plant growth. This was the main advantage of the binder system over OPC when applied to soil bioengineering. The laboratory study suggests that the binder is suitable for soil solidification engineering and has been applied in riverbank ecological restoration engineering at Nanhui District in Shanghai.