Abstract
The fluidity of mortar containing a polycarboxylate-based high-range water-reducing AE agent was studied with respect to the change in fluidity with time after the mixing, and the influence of the kind and amount of calcium sulfate in the belite-rich cement with a low interstitial phases was discussed. The flow of belite-rich cement mortar immediately after the mixing initially increased and then decreased with the increase in the saturation ratio of the liquid phase with respect to CaSO4·2H2O. On the other hand, the flow loss continuously decreased with the increase in the saturation ratio. The saturation ratio of the liquid phase strongly depended on the amount of CaSO4·0.5H2O, and was hardly affected by the other kinds of calcium sulfate. The adsorption of the agent inversely corresponded to the mortar flow immediately after the mixing. However, the flow loss did not coincide with the adsorption tendency. It is suggested that the steric hindrance remains to some degree after the hydrate partially covers the agent adsorbed on the cement particles.
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