改性沸石粉-水泥固化Cu污染土强度试验研究  

Experimental study on strength of Cu contaminated soil be cured by modified zeolite powder-cement

作　　者：朱明杰 常文凯 Zhu Mingjie;Chang Wenkai(Guizhou Survey&Desearch Institute for Water Resources and Hydropower,Guiyang Guizhou 550002,China)

机构地区：[1]贵州省水利水电勘测设计研究院有限公司,贵州贵阳550002

出　　处：《山西建筑》2023年第19期69-74,共6页Shanxi Architecture

摘　　要：土体遭受Cu污染后不仅对植物生长造成危害,其中的Cu也会通过食物链逐级富集,最终对人体造成威胁,并且土体中的Cu^(2+)可能对土体本身的微观结构、力学性质等产生影响。目前,国内外对重金属污染土通常采用水泥固化处理,但需要大量水泥才能达到理想除污效果。选取改性沸石粉与水泥对Cu污染土进行联合固化,通过强度试验发现土体受重金属铜污染后,无侧限抗压强度值会降低,采用改性沸石粉-水泥稳定/固化后,显著提高了土体的无侧限抗压强度,并且固化后土体的无侧限抗压强度值与水泥掺量、Cu^(2+)浓度和养护龄期等因素相关,其中Cu^(2+)浓度影响较小,水泥掺量和养护龄期对强度值的影响均比较大。The soil after suffering Cu pollution not only harm to plant growth,will also enrichment of the Cu step by step through food chain,eventually pose a threat to the human body;the Cu^(2+)of soil itself may affect the microstructure,mechanical properties,etc.of the soil.At present heavy metal pollution at home and abroad usually adopt cement solidification treatment,but need a lot of cement can achieve ideal cleaning effect.This article selects the modified zeolite powder and cement to joint Cu pollution soil,found that the soil polluted by heavy metal copper unconfined compressive strength value decreased by strength test,after stabilized/solidified by modified zeolite powder-cement,significantly improve the unconfined compressive strength of the soil,and the unconfined compressive strength value has some connection with cement content and curing age,Cu^(2+)concentration and other related factors,including Cu^(2+)concentration has little effect,cement content and curing age on the influence of intensity values are bigger.

关 键 词：Cu污染土 改性沸石 水泥固化 强度试验 

分 类 号：TU411[建筑科学—岩土工程]