期刊
CEMENT AND CONCRETE RESEARCH
卷 146, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2021.106491
关键词
Alkali-silica reaction; Ion adsorption; Monte Carlo simulations; Zeta potential
Alkali-silica reaction (ASR) is a significant factor in global concrete durability issues. Research shows that divalent ions can co-adsorb on C-S-H and ASR products under different pH and pore water chemistry conditions.
Alkali-silica reaction (ASR) is one of the most important concrete durability issues worldwide. ASR products formed at high temperature have a structure similar to the natural mineral shlykovite. Reactive Grand Canonical Simulations were used to investigate sorption of K+, Cl- and Ca2+ on C-S-H and ASR products at different pH (10.0 to 13.0) and pore water chemistry. Divalent ions can overcompensate for the negative surface charge, in particular for C-S-H, which leads to a co-adsorption of negative species such as Cl-. At high K/Ca in solution, monovalent K+ can desorb calcium from C-S-H and shlykovite surface. The calculated Ca/K partition coefficient shows a higher affinity of ASR product for K+, while C-S-H favours Ca2+. The uptake of K+ by ASR products lowers the alkali concentration in the solution and could thus slow down the rate of ASR.
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