STUDY ON THE COMPRESSIVE STRENGTH DEVELOPMENT MECHANISM OF CONCRETE WITH SODIUM CHLORIDE ADDED UNDER SEALED CURING

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  • NaCl添加コンクリートの封かん養生下での圧縮強度発現メカニズムに関する研究

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<p> Concrete using seawater as the mixing water contains NaCl. NaCl is often added when evaluating the alkali-silica reactivity of concrete. However, there have been few reports of the compressive strength of concrete which NaCl has been added under the sealed curing. In this study, the concrete specimens with NaCl added were cured in water or sealed condition, and the compressive strength was measured at each age. In addition, the hydration reaction analysis and the autogenous shrinkage measurement were carried out.</p><p> From these results, in the case of the sealed curing, it was confirmed that the compressive strength of initial age decreased as the increment of NaCl addition. From the results of the hydration reaction analysis, it was guessed that the decrease in compressive strength was caused by the phenomenon that the cement hydration was obstructed by the generation of the alumina gel. Moreover, in the sealed curing, in addition to the effect of obstructing the cement hydration, it was guessed that the formation of alumina gel increased self-desiccation and caused a decrease in compressive strength.</p>

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