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Effect of lithium carbonate on hydration of C3A

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Document pages: 8 pages

Abstract: It is well known that lithium salt can improve the effect of alkali silica reaction and have a significant effect on cement setting. However, there are few reports on the mechanism of cement hydration, especially the mechanism of C3A hydration, which plays a key role in the initial setting time of cement. In this study, the changes of pH value, conductivity, thermodynamics and mineral composition of pore solution during hydration of C3A with or without Li2CO3 were studied. The results show that the activity of lithium ion in the solution is higher than that of calcium ion, and Li2CO3 leads to the carbonization of C3A hydration products. Li2CO3 promotes C3a hydration through high alkalinity. In c3a-caso4 · 2h2o-ca (OH) 2-h2o hydration system, Li2CO3 is conducive to C3a hydration and affects mineral compositioncal variation of the ettringite phase(s).

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