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Report No.
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Mechanism of alkalinity lowering and chemical equilibrium model of high fly ash silica fume cement

Hoshino, Seiichi; Negishi, Kumi*; Honda, Akira

A pH lowering mechanism of highly flyash contained silicafume cement (HFSC) in Region I and the chemical equilibrium model of HFSC incorporating the mechanism were studied. As a result, it is suggested that the dissolution and precipitation behavior of SO$$_{4}$$$$^{2-}$$ partially contributes to the pH lowering of HFSC in Region I. A chemical equilibrium model of HFSC incorporating alkali (Na, K) adsorption, which was supposed as another contributing factor of pH lowering effect, was also developed, and immersion experiment of HFSC was analyzed using the model. The calculated results by the developed model were in agreement with the experiment results. From the above results, it was concluded that the pH lowering of HFSC in Region I was attributed to both of the dissolution and precipitation behavior of SO$$_{4}$$$$^{2-}$$ and the alkali adsorption.

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