Influence of Freeze-Thaw Cycles on the Strength and Leaching Characteristics of Chromium-Contaminated Soil Repaired by Reduction-Solidification/Stabilization

被引：0
作者：
Li X. [1 ]
Tong Z. [1 ]
Liu L. [1 ]
Yu X. [1 ]
Meng D. [2 ]
机构：
[1] School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning
[2] School of Built Environment, University of New South Wales, Sydney, 2052, NSW
来源：
Li, Xilin (lixilin@lntu.edu.cn) | 1600年 / Eastern Macedonia and Thrace Institute of Technology卷 / 14期
基金：
中国国家自然科学基金;
关键词：
Chromium-contaminated soil; Combined remediation; Freeze-thaw cycles; Stability; Synthetic zeolite from fly ash;
D O I：
10.25103/jestr.141.06
中图分类号：
学科分类号：
摘要：
The key to the application of chromium-contaminated soil as roadbed fillings and building materials after remediation is to determine the stability of the soil. However, there are some problems with the single remediation technology such as poor repaired effects and instability under extreme weather conditions. To resolve this problem, the composite preparation (calcium polysulfide, synthetic zeolite from fly ash and cement) was used for reduction-solidification/ stabilization. The effects of the zeolite contents, cement contents, initial chromium concentrations and numbers of freezethaw cycles on the freeze-thaw cycles stability were explored. The freeze-thaw damage mechanism under different numbers of freeze-thaw cycles was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Results demonstrate that during freeze-thaw cycles, the increase in cement contents is beneficial to increase the unconfined compressive strength (UCS) of chromium-contaminated soil after remediation, but it cannot meet the leaching requirement of total chromium in high-concentrations chromium-contaminated soil. The increase in zeolite contents has little effect on the UCS, but it does reduce the leaching of total chromium. Changes in the pollutants concentrations can retard the hydration reaction in the soil structure to different degrees. In the initial freeze-thaw cycles, the UCS increases slightly, and the leaching concentrations of pollutants decrease. Then, the UCS decreases gradually, while the leaching concentrations of pollutants increase gradually. After the freeze-thaw cycles, the chromiumcontaminated soil after combined remediation can maintain a low leaching rate and show a little strength loss, which means it can be applied as roadbed fillings and building materials. Conclusions provide a significant reference for the engineering application of chromium-contaminated soil after remediation. © 2021 School of Science, IHU. All rights reserved.
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页码：61 / 70
页数：9
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