Effect of sulfate in cement and environment on the leaching behavior of Cr(VI) immobilized in cement paste

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-10-17 DOI:10.1617/s11527-025-02774-y

Yuan Wang, Zhi Wang, Linbo Jiang, Jincheng Yu, Jinghang Niu

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Abstract

Sulfate in cement and the environment can affect leching of Cr(VI) immobilized in cement paste according to the immobilization mechanism of Cr(VI) in cement paste. In this study, the influence of sulfate in cement and environment on the leaching behavior of Cr(VI) immobilized in cement paste was studied, and the mechanism of the influence of leaching behavior was analyzed by XRD, FTIR and SEM–EDS. Results: The sulfate in cement will affect the adsorption amount of Cr(VI) by C–S–H, which eventually leads to Cr(VI) leaching; The sulfate in the environment will enter the AFt phase, displacing the Cr(VI) that is solidified in the AFt (ettringite, 3CaO·Al₂O₃·3CaSO₄·32H₂O) phase, resulting in an increase in the leaching amount of Cr(VI) that is immobilized in the hydration product in the sulfate environment. When both sulfate ions (SO₄²⁻) and magnesium ions (Mg²⁺) are present in the environment, the sulfate ions and calcium ions (Ca²⁺) will form gypsum, which will reduce the loss of hexavalent chromium (Cr(VI)); The research found that the Cr(VI) that is solidified in cement shows a trend where its leaching amount increases initially and then decreases as the pH value in the environment decreases. The Cr(VI) that is solidified in C–S–H is leached first, while the Cr(VI) that is solidified in AFt is leached later. It is necessary to consider the sulfates in the cement and the environment for the Cr(VI) immobilized in the cement paste.

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水泥中硫酸盐及环境对水泥浆中固定Cr（VI）浸出行为的影响

根据水泥浆体中Cr（VI）的固定机理，水泥中的硫酸盐和环境会影响水泥浆体中固定Cr（VI）的浸出。本研究研究了水泥中硫酸盐和环境对水泥膏体中固定化Cr（VI）浸出行为的影响，并通过XRD、FTIR和SEM-EDS分析了其浸出行为的影响机理。结果：水泥中的硫酸盐会影响C-S-H对Cr（VI）的吸附量，最终导致Cr（VI）浸出；环境中的硫酸盐会进入AFt相，取代在AFt（钙矾石，3CaO·Al2O3·3CaSO4·32H2O）相中固化的Cr(VI)，导致硫酸盐环境中固定在水化产物中的Cr（VI）的浸出量增加。当环境中同时存在硫酸根离子（SO42−）和镁离子（Mg2+）时，硫酸根离子和钙离子（Ca2+）形成石膏，减少六价铬（Cr(VI)）的损失；研究发现，随着环境pH值的降低，水泥中固化的Cr（VI）的浸出量呈现先增加后减少的趋势。在C-S-H中固化的Cr（VI）先浸出，在AFt中固化的Cr（VI）后浸出。在水泥浆体中固定化Cr（VI）需要考虑水泥中的硫酸盐和环境因素。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.