本研究探討在不同離子濃度與萘磺酸基強塑劑劑量下C3A-石膏-鈣礬石於水化初期之流變及強塑劑吸附行為，進而討論影響水泥漿體流變與強塑劑吸附行為之主要因子。研究發現，水泥漿體水化初期之黏度改變可能與C3A的水化作用密切相關，C3A之黏度在水化短時間內大幅上升，而水化後期之黏度則變化不定。水泥漿體晚期的黏度可能受石膏所影響，鈣礬石的影響則較低。此外，若提高溶液中的鹼離子濃度，石膏與鈣礬石的黏度皆隨著強塑劑劑量之增加而減少。另一方面，就強塑劑的吸附行為而言，C3A的單位面積吸附量極高，故水泥漿體中之強塑劑吸附量可能多源於C3A上的吸附。另一方面，在高強塑劑劑量下石膏的單位面積吸附量較C3A低但比鈣礬石還高。當增加拌合溶液中的鹼離子濃度時，強塑劑對石膏之吸附較易飽和，其吸附曲線趨於平緩，而鈣礬石之吸附量則不易達飽和，C3A單位面積之強塑劑吸附量略為提高。總而言之，在不同的鹼離子濃度下，強塑劑之吸附還是以C3A為最高，而水泥水化初期之黏度與C3A的強塑劑吸附行為密切相關。

This study explored the rheological behaviors and superplasticizer adsorptions of C3A-gypsum-ettringite in the presence of the naphthalene-based superplasticizer and then further discussed the major influencing factors in the rheological behaviors and superplasticizer addition of the cement pastes. Results showed that the viscosities of the cement pastes during the early hydration were possibly associated with the hydration of C3A. The viscosity of C3A was increased greatly but fluctuated at later hydration time. The viscosities of the cements at later hydration time were possibly influenced by the gypsum, and then the ettringite. In addition, when the alkali concentrations in solutions were increased, both the viscosities of the gypsum and ettringite were reduced by the increases of superplasticizer dosages. The superplasticizer adsorption on the cement particles was mostly attributed to the high adsorption per unit surface area of C3A. On the other hand, at high superplasticizer dosages, the adsorption of gypsum per unit surface area is lower than that of C3A but higher than that of ettringite. When the alkali concentrations in pore solutions were increased, the adsorption of gypsum is saturated at a less superplasticizer dosage, leading to a smooth adsorption curve. In contrast, the adsorption on ettringite is always not saturated. The adsorption on C3A per unit surface area is only increased slightly. In summary, at different alkali concentrations, the superplasticizer adsorption was always the highest in C3A, suggesting that the viscosity of the cement paste during the early hydration was closely associated with that adsorption on C3A.

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