碳化作用对水泥固化/稳定化铅污染土溶出特性影响

doi:10.16285/j.rsm.2016.01.005

›› 2016, Vol. 37 ›› Issue (1): 41-48.doi: 10.16285/j.rsm.2016.01.005

碳化作用对水泥固化/稳定化铅污染土溶出特性影响

章定文^{1, 2}，张涛³，刘松玉^{1, 2}，曹智国^{1, 2}

1. 东南大学交通学院，江苏南京 201196；2. 东南大学江苏省城市地下工程与环境安全重点实验室，江苏南京 210096； 3. 江苏省交通规划设计院股份有限公司，江苏南京 210005

收稿日期:2014-06-16 出版日期:2016-01-11 发布日期:2018-06-09
作者简介:章定文，男，1978年生，博士，教授，博士生导师，主要从事交通岩土工程和环境岩土工程方面的研究与教学工作
基金资助:
国家自然科学基金项目（No.51578148；No.51279032）；江苏省自然科学基金（No.BK2011618）；中央高校基本科研业务费专项资金项目（No.2242014R30020）；江苏省高校“青蓝工程”优秀青年骨干教师培养对象资助项目

Effect of carbonation on leaching properties of cement stabilized/solidified lead contaminated soil

ZHANG Ding-wen^{1, 2}, ZHANG Tao³, LIU Song-yu^{1, 2}, CAO Zhi-Guo^{1, 2}

1. School of Transportation, Southeast University, Nanjing, Jiangsu 210096, China; 2. Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Southeast University, Nanjing, Jiangsu 210096, China; 3. Jiangsu Province Communications Planning and Design Institute Limited Company, Nanjing, Jiangsu 210014, China

Received:2014-06-16 Online:2016-01-11 Published:2018-06-09
Supported by:
This work was supported by the National Natural Science Foundation of China (51578148, 51279032), the National Science Foundation of Jiangsu Province of China(BK2011618), the Fundamental Research Funds for the Central Universities (2242014R30020) and the Personnel Training Fund for Outstanding Young Teacher of Qing-lan Project of Higher Education in Jiangsu Province.

摘要/Abstract

摘要： 采用室内加速碳化试验方法，分析了碳化作用对水泥固化/稳定化重金属污染土淋滤特性的影响规律。对人工配制的不同浓度铅污染土进行水泥固化/稳定化处理，标准养护28 d后对部分土样进行加速碳化试验，剩余试样继续标准养护。通过半动态淋滤试验方法测试了碳化后试样和标准养护试样的铅溶出量，并计算铅扩散系数、固化/稳定化土淋滤指数，分析碳化作用对水泥固化/稳定化铅污染土环境安全性以及铅溶出机制的影响。结果表明，单位面积上铅的溶出速率随淋滤时间的增加而降低；浸出液中铅累计溶出量与淋滤时间的平方根呈近似线性关系；碳化养护试样的铅累计溶出量是标准养护试样的0.68～0.91倍，碳化有利于铅的固化/稳定化。固化稳定化处理后铅的扩散系数在2.12×10-12～1.39×10-9 cm2/s之间，淋滤指标在8.86～11.7之间，且碳化作用下铅的扩散系数进一步降低，淋滤指标略有升高。低铅含量土样中铅溶出机制为表面侵蚀，而高铅含量试样中铅溶出机制为表面侵蚀和扩散共同作用，并以扩散为主。

关键词: 固化/稳定化, 铅污染土, 半动态淋滤试验, 扩散系数, 淋滤指标, 溶出机制

Abstract: This study explores the effect of carbonation on leaching properties of cement stabilized/solidified lead contaminated soil using the semi-dynamic leaching tests. Artificially contaminated soils with three different lead contents are solidified with different amounts of cement. The solidified samples are curing under the standard conditions for 28 days, and part samples are selected to conduct accelerated carbonation tests, while the residual samples continued to cure. The environmental safety of cement stabilized/solidified lead contaminated soils are assessed; and the leaching mechanism of lead is discussed using the diffusion coefficient of lead and leaching index of solidified/ stabilized lead contaminated soils. The results indicate that the rate of lead leaching decreases with increasing the leaching time. The results also show that a linear function adapts approximately the cumulative amount of lead leaching with square root of leaching time. The cumulative amount of lead leaching of the carbonated samples are 0.68 to 0.91 times that of the standard curing samples, indicating that lead is solidified/ stabilized with carbonation. The diffusion coefficient of lead of solidified/ stabilized soils ranges between 2.12×10-12 cm2/s and 1.39×10-9 cm2/s, and the leaching index changes from 8.86 to 11.7. The carbonation curing results in a decease in diffusion coefficient of lead and a slight increase in leaching index. The leaching mechanism of lead from the solidified/ stabilized soils with low lead concentration is controlled by surface wash-off. However, the leaching mechanism of lead from the solidified/stabilized soils with high lead concentration is a combined result of surface wash-off and diffusion, and the diffusion controls the process.

Key words: stabilization/solidification, lead contaminated soil, semi-dynamic leaching test, diffusion coefficient, leaching index, leaching mechanism

中图分类号:

TU 411

章定文，张涛，刘松玉，曹智国 , . 碳化作用对水泥固化/稳定化铅污染土溶出特性影响[J]. , 2016, 37(1): 41-48.

ZHANG Ding-wen , ZHANG Tao , LIU Song-yu , CAO Zhi-Guo , . Effect of carbonation on leaching properties of cement stabilized/solidified lead contaminated soil[J]. , 2016, 37(1): 41-48.

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碳化作用对水泥固化/稳定化铅污染土溶出特性影响

Effect of carbonation on leaching properties of cement stabilized/solidified lead contaminated soil

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