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The effect of artificial leaching with HCl on chloride binding in ordinary Portland cement paste
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.cemconres.2020.105976
Petter Hemstad , Alisa Machner , Klaartje De Weerdt

Abstract This study investigates how the pH in the pore solution influences the chloride binding in Portland cement pastes. Cement paste samples were exposed to NaCl, CaCl2 and HCl solutions. The mechanisms of changes in chloride binding were investigated using a wide variety of techniques both for the liquid and solid phase. Lowering the pH from 13 to 12 with CaCl2 or HCl greatly increased chloride binding compared to NaCl, which was associated with increased amounts of chlorides in the AFm-phases. Lowering the pH below 12 lead to reduced chloride binding in part due to dissolution of AFm. Chloride binding approached zero at a pH of 9. The influence of C-S-H on changes in chloride binding could not be conclusively determined. The impact of leaching and low pH on chloride binding is key to explaining the peaking behaviour of chloride profiles in concrete submerged in chloride containing solutions like sea water.

中文翻译:

盐酸人工浸出对普通硅酸盐水泥浆中氯离子结合的影响

摘要 本研究调查孔隙溶液中的 pH 值如何影响波特兰水泥浆中的氯化物结合。水泥浆样品暴露于 NaCl、CaCl2 和 HCl 溶液中。使用液相和固相的多种技术研究了氯化物结合变化的机制。与 NaCl 相比,使用 CaCl2 或 HCl 将 pH 从 13 降低到 12 大大增加了氯化物结合,这与 AFm 相中氯化物的数量增加有关。将 pH 值降低到 12 以下会导致氯化物结合减少,部分原因是 AFm 的溶解。在 pH 值为 9 时,氯化物结合接近于零。无法最终确定 CSH 对氯化物结合变化的影响。
更新日期:2020-04-01
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