水泥固化六价铬污染土力学性能及微观结构研究

doi:10.11934/j.issn.1673-4831.2018.10.012

生态与农村环境学报 ›› 2018, Vol. 34 ›› Issue (10): 946-954.doi: 10.11934/j.issn.1673-4831.2018.10.012

水泥固化六价铬污染土力学性能及微观结构研究

熊路, 申向东, 薛慧君, 李根峰, 原奇, 邹欲晓

内蒙古农业大学水利与土木建筑工程学院, 内蒙古呼和浩特 010018

收稿日期:2017-11-24 出版日期:2018-10-25 发布日期:2018-10-25
通讯作者: 申向东 E-mail:ndsxd@163.com
作者简介:熊路(1990-),男,河南驻马店人,硕士生,主要研究方向为新材料与新结构体系。E-mail:870964098@qq.com
基金资助:
国家自然科学基金（51569021，51769025）；内蒙古自治区博士研究生科研创新重点项目（B20161012908Z）

Experimental Research of Mechanical Properties and Microstructure of Cement Solidified Hexavalent Chromium-Contaminated Soils

XIONG Lu, SHEN Xiang-dong, XUE Hui-jun, LI Gen-feng, YUAN Qi, ZHOU Yu-xiao

College of Water Conservancy and Civil Engineering Inner Mongolia Agricultural University, Hohhot 010018, China

Received:2017-11-24 Online:2018-10-25 Published:2018-10-25

摘要/Abstract

摘要：

通过一系列无侧限抗压强度和电阻率试验，研究养护龄期、水泥掺量和六价铬离子含量对固化污染土无侧限抗压强度和电阻率的影响以及无侧限抗压强度和电阻率之间的关系。研究发现：水泥固化铬污染土的无侧限抗压强度和电阻率随着养护龄期的增加而增大，但增长速率有所不同。铬离子含量越高，水泥固化铬污染土的无侧限抗压强度越低，电阻率越低；水泥掺量越多，水泥固化铬污染土的无侧限抗压强度越大，养护龄期越长，后期增长较大；当养护龄期较短时，固化土的电阻率随水泥掺量的增大略有提高。10%水泥掺量下的无侧限抗压强度（p_u）和电阻率（ρ）近似呈线性关系：p_u=0.740 ρ+1.853，R²=0.917。淋滤实验结果表明：随着固化剂掺量和养护龄期的增加，重金属浸出率降低，固化效果较好。核磁共振试验结果发现：水泥掺量越高，其水化产物越多，水化产物嵌入孔隙，孔径范围越小。微观空隙分析表明：水泥掺量越高，试样整体的平整度和密实性越好，强度越高。

关键词: 污染土, 六价铬, 无侧限抗压强度, 电阻率, 淋滤, 核磁共振, 微观结构

Abstract:

A series of electrical resistivity and unconfined compressive strength of hexavalent chromium polluted soil solidified with cement were measured, to reveal the influence of law of age, hexavalent chromium ion content and cement content on unconfined compressive strength and electrical resistivity of the hexavalent chromium polluted soil solidified with cement, and the relationship between the resistivity and unconfined compressive strength. The results show that, unconfined compressive strength and electrical resistivity of hexavalent chromium polluted soil solidified with cement increase with age, and the growth rate is different. The higher the chromium ion content, the lower the unconfined compressive strength and electrical resistivity of hexavalent chromium polluted soil solidified with cement. The more cement content, the greater the unconfined compressive strength of hexavalent chromium polluted soil solidified with cement. The unconfined compressive strength grows with age. When the curing time was shorter, the electrical resistivity of hexavalent chromium polluted soil solidified with cement increased slightly with the increase of cement content in the early age. Unconfined compressive strength(p_u) of samples with 10% cement is approximately linear with electrical resistivity(ρ) of:p_u=0.740 ρ+1.853,R²=0.917. The results of leaching experiments show that the leaching rate of metal decreased and the curing effect becomes better with the increase of curing agent content and curing age. Results of nuclear magnetic resonance revealed that the more hydration producs are embedded in the pore of soil with the increase of cement content, then the pore size range gets smaller. Based on analysis data in micro-pore structures, it shows that the overall smoothness and compactness of the specimens becomes better, and the strength increases with the increase of cement content.

Key words: hexavalent chromium, contaminated soil, electrical resistivity, unconfined compressive strength, leaching, magnetic resonance, microstructure

中图分类号:

熊路, 申向东, 薛慧君, 李根峰, 原奇, 邹欲晓. 水泥固化六价铬污染土力学性能及微观结构研究[J]. 生态与农村环境学报, 2018, 34(10): 946-954.

XIONG Lu, SHEN Xiang-dong, XUE Hui-jun, LI Gen-feng, YUAN Qi, ZHOU Yu-xiao. Experimental Research of Mechanical Properties and Microstructure of Cement Solidified Hexavalent Chromium-Contaminated Soils[J]. Journal of Ecology and Rural Environment, 2018, 34(10): 946-954.

参考文献

[1] TASHIRO C,OBA J.The Effects of Cr₂O₃,Cu(OH)₂,ZnO and PbO on the Compressive Strength and the Hydrates of the Hardened C₃A Paste[J].Cement and Concrete Research,1979,9(2):253-258.
[2] BURDEN F,DONNERT D,GODISH T,et al.Environmental Monitoring Handbook[M].New York,USA:The McGraw-Hill Companies,2004:653-659.
[3] HAMILTON I W,SAMMES M N.Encapsulation of Steel Foundry Bag House Dusts in Cement Mortar[J].Cement and Concrete Research,1999,29(1):55-61.
[4] 刘晶晶,查甫生,郝爱玲,等.NaCl侵蚀环境下水泥固化铬污染土的强度及淋滤特性[J].岩土力学,2015,36(10):2855-2861,2876.[LIU Jing-jing,ZHA Fu-sheng,HAO Ai-ling,et al.Strength and Leaching Characteristics of Chromium Polluted Soil Solidified With Cement in a NaCl Erosion Environment[J].Rock and Soil Mechanics,2015,36(10):2855-2861,2876.]
[5] 韩超,申向东,薛慧君,等.镉污染土在水泥-粉煤灰-石灰共同作用下固化效果及空隙特征[J].农业环境科学学报,2017,36(4):686-693.[HAN Chao,SHEN Xiang-dong,XUE Hui-jun,et al.Curing Effect and Pore Characteristics of Cadmium Contaminated Soil Under the Action of Cement-Fly Ash-Lime[J].Journal of Agro-Environment Science,2017,36(4):686-693.]
[6] 樊浩伦,申向东,周海龙,等.水泥固化锌污染土强度与微观空隙特征[J].农业环境科学学报,2016,35(6):1064-1070.[FAN Hao-lun,SHEN Xiang-dong,ZHOU Hai-long,et al.Strength and Micropore Characteristics of Cement-Solidified/Stabilized Zinc-Contaminated Red Clay[J].Journal of Agro-Environment Science,2016,35(6):1064-1070.]
[7] 查甫生,郝爱玲,许龙,等.水泥固化重金属污染土的淋滤特性试验研究[J].工业建筑,2014,44(1):65-70.[ZHA Fu-sheng,HAO Ai-ling,XU Long,et al.Experimental Study of Leaching Characteristics of Cement Solidified and Stabilized Heavy Metal Contaminated Soils[J].Industrial Construction,2014,44(1):65-70.]
[8] 李喜林,张佳雯,陈冬琴,等.水泥固化铬污染土强度及浸出试验研究[J].硅酸盐通报,2017,36(3):979-983.[LI Xi-lin,ZHANG Jia-wen,CHEN Dong-qin,et al.Strength and Leaching for Remediation of Chromium Contaminated Soil Using Cement[J].Bulletin of the Chinese Ceramic Society,2017,36(3):979-983.]
[9] 刘玲,刘海卿,张颖,等.石灰和粉煤灰固化修复六价铬污染土试验研究[J].硅酸盐通报,2015,34(11):3361-3365.[LIU Ling,LIU Hai-qing,ZHANG Ying,et al.Experimental Study of Lime and Fly Ash for Solidification Remediation of Hexavalent Chromium Contaminated Soil[J].Bulletin of the Chinese Ceramic Society,2015,34(11):3361-3365.]
[10] 陆晓春,能昌信,龚育龄,等.铬污染土电阻率实验的比较与分析[J].环境科学与技术,2013,36(6):79-81.[LU Xiao-chun,NAI Chang-xin,GONG Yu-ling,et al.Analysis and Contrast of Chrome-Contaminated Soil Experiment of Resistivity[J].Environmental Science & Technology,2013,36(6):79-81.]
[11] 白兰,周仲华,张虎元,等.污染土的电阻率特征分析[J].环境工程,2008,26(2):66-69.

[1]	赵家印, 席运官, 代慧杰, 金淑, 田伟. 钝化剂与有机肥配施对土壤有效态重金属及其在生菜中累积的影响[J]. 生态与农村环境学报, 2019, 35(11): 1460-1467.
[2]	陈晶, 张毅敏, 杨飞, 孔明, 张志伟, 巴翠翠, 尹杰. 基于核磁共振技术的滆湖沉积物有机磷垂直分布特征[J]. 生态与农村环境学报, 2018, 34(9): 850-856.
[3]	邓天天, 马培, 李晗晟, 郭枫, 吴烨. FeCl₃-柠檬酸对低浓度As³⁺污染土壤的淋洗特性[J]. 生态与农村环境学报, 2018, 34(2): 169-176.
[4]	梁俊捷, 张世熔, 廖成阳, 肖罗怡, 王贵胤. 酒石酸、柠檬酸和苹果酸对污染土壤中镧的去除效果[J]. 生态与农村环境学报, 2016, 32(1): 115-119.
[5]	樊建新, 王玉军, 崔晓丹, 范婷婷, 周东美. 基于同步辐射的硬X射线荧光技术分析污染土壤中重金属分布[J]. 生态与农村环境学报, 2013, 29(3): 375-379.
[6]	杜瑞英. 土壤改良剂和红麻联合修复对多金属污染土壤中微生物群落功能的影响[J]. 生态与农村环境学报, 2013, 29(1): 70-75.
[7]	黄健, 李春玉, 刘济宁, 石利利, 姚成. 生物堆模拟法修复苯并[a]芘和二苯并[a,h]蒽污染土壤[J]. 生态与农村环境学报, 2012, 28(2): 221-224.
[8]	黄春雷;宋明义;蔡子华;潘卫丰;陈智渊;宋金秋. 基于环境背景值的重金属污染地块划定——以浙东沿海某典型固体废物拆解区污染土壤为例[J]. 生态与农村环境学报, 2010, 26(6): 605-609.
[9]	周航, 肖锦华, 曾敏, 廖柏寒. 2种无机洗脱剂对矿区污染土壤中铅、镉的洗脱研究[J]. 生态与农村环境学报, 2010, 26(3): 241-245.
[10]	袁敏, 铁柏清, 唐美珍, 秦普丰. 改良剂对铅锌尾矿污染土壤上龙须草生长和叶片叶绿素含量的影响[J]. 生态与农村环境学报, 2005, 21(4): 54-57.
[11]	王曙光, 林先贵. 菌根在污染土壤生物修复中的作用[J]. 生态与农村环境学报, 2001, 17(1): 56-59.
[12]	周修萍, 江静蓉, 秦文娟. 中国南方几种土壤的酸雨淋溶特性[J]. 生态与农村环境学报, 1988, 4(1): 17-22.

水泥固化六价铬污染土力学性能及微观结构研究

Experimental Research of Mechanical Properties and Microstructure of Cement Solidified Hexavalent Chromium-Contaminated Soils

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 12

编辑推荐

Metrics

本文评价