Influence of chloride solutions on the leaching of heavy metals from cement hydrates

被引：3
作者：
Zhou, Shaojun [1 ]
Ogawa, Yuko [1 ]
Kawai, Kenji [1 ]
机构：
[1] Hiroshima Univ, Dept Civil & Environm Engn, 1-4-1 Kagamiyama, Higashihiroshima, Japan
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 378卷
关键词：
Cement; Mortar specimens; Heavy metals; Chloride solution; CSH; Adsorption properties; Tank leaching test; Leaching behavior; pH; X-ray diffraction; C-S-H; WASTE-WATER; PH; CARBONATION; BEHAVIOR; PERFORMANCE; AGGREGATE; STRENGTH; KINETICS; CONCRETE;
D O I：
10.1016/j.conbuildmat.2023.131108
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study investigates how chloride-based salts affect the immobilization and leaching of Cu, Zn, and Pb from cement hydrates and analyzes the associated internal changes in crystalline phase. Results showed that the amount of Pb leached is highest in mortar when it contacts with CaCl2 solution. A key reason for this outcome is that calcium silicate hydrate (CSH) has the lowest Pb adsorption in CaCl2 solution. Exposure to MgCl2 solution resulted in the decomposition of most portlandite to form brucite in mortars, lowering the pH to similar to 9. This caused the lowest leaching rate of Cu, Zn, and Pb in MgCl2 solution.
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页数：11
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