淋滤条件下水泥固化铅污染高岭土的强度及 微观特性的研究

刘兆鹏; 杜延军; 刘松玉; 蒋宁俊; 朱晶晶

doi:10.11779/CJGE201403018

淋滤条件下水泥固化铅污染高岭土的强度及微观特性的研究 English Version

东南大学交通学院岩土工程研究所,江苏南京 210096

基金项目: 国家自然科学基金项目（51278100,41330641）; 江苏省自然科学基金项目（BK2012022,BK2010060）; 国家863计划项目（2013AA06A206）

详细信息

作者简介:
刘兆鹏(1989- )，男，硕士研究生，主要从事环境岩土工程研究。E-mail: liuzhp90@163.com。

通讯作者:
杜延军

中图分类号: TU47
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出版历程
- 收稿日期: 2013-07-04
- 发布日期: 2014-03-19

Strength and microstructural characteristics of cement solidified lead-contaminated kaolin exposed to leaching circumstances

Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing 210096, China

摘要

摘要: 通过半动态淋滤试验,研究淋滤液初始pH=2,4,7时水泥固化铅污染土的强度、微观和钙溶出特性。无侧限抗压强度试验及钙溶出率（CFR_Ca）结果表明：半动态淋滤试验使试样无侧限抗压强度（q_u）较标准养护39 d试样降低了1%～42%；淋滤液初始pH=2时,CFR_Ca为pH=4或7时的2～7倍,而pH=4与7时q_u及CFR_Ca差别均不明显；水泥掺量由12%提高到18%时,q_u增大了35%～98%,CFR_Ca降低了40%～58%；固化铅污染土较固化未污染土,其q_u小50%～68%,而CFR_Ca大29%～175%。试样无侧限抗压强度比q_r（淋滤后试样q_u/标准养护39 d试样q_u）与CFR_Ca在双对数坐标下呈现良好线性关系：随CFR_Ca增大,q_r减小,说明钙的溶出是控制固化污染土/未污染土强度的主要因素之一。X射线衍射、扫描电镜及压汞试验结果表明,高浓度铅抑制水泥水化/火山灰反应,固化铅污染土与固化未污染土孔隙分布分别呈单峰和双峰特征,固化铅污染土中铅形成Si-O-Pb结合体、PbAl₂O₄、CaPbO₃等沉淀是铅固化稳定化的主要机理之一。
- 固化/稳定 /
- 铅 /
- 半动态淋滤 /
- 无侧限抗压强度 /
- 微观特性 /
- 溶出率
Abstract: The strength and microstructural characteristics of cement stabilized/solidified lead-contaminated kaolin clay are investigated. The leaching of calcium (Ca) is studied under the targeted leachant pH of 2, 4, and 7 via a series of semi-dynamic leaching tests. The results reveal that the unconfined compressive strength (q_u) of the stabilized/solidified soils experiencing the semi-dynamic leaching tests is 1% to 42% lower than that of the soils cured for 39 days under standard conditions (SC). The cumulative leaching fraction of Ca (CFR_Ca) at the leachant pH of 2 is 2 to 7 times greater than that at the leachant pH of 4 or 7. The difference in q_u or CFR_Ca of the soils experiencing the semi-dynamic leaching tests at the lechant pH of 4 and 7 is marginal. When the cement content increases from 12% to 18%, q_u increases by 35% to 98%; whereas CFR_Ca decreases by 40% to 58%. Furthermore, q_u of the stabilized/solidified lead-contaminated soils is 50% to 68% lower, and CFR_Ca is 29% to 175% higher than that of the stabilized/solidified clean soils. An empirical equation is proposed for predicting the loss of unconfined compressive strength (i.e., ratio of q_u obtained after leaching tests to that obtained at curing time of 39 days under standard conditions) using CFR_Ca. It is shown that the proposed method has high accuracy. The results of X-ray diffraction, scanning electron microscope, and mercury intrusion porosimetry analysis show that the relatively high concentration of Pb has remarkably retarded hydration/pozzolanic reactions in the stabilized/solidified lead-contaminated soils. Therefore, the strength development, leaching of Ca, and microstructural characteristics of the stabilized/solidified lead-contaminated soils differ from those of the stabilized/solidified clean soils in a notable manner.
- solidification/stabilization /
- lead /
- semi-dynamic leaching test /
- unconfined compressive strength /
- microstructural characteristic /
- cumulative leaching fraction

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参考文献(27)

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