本研究利用飛灰(0-40 %)與石灰石粉末(10 %)取代部分水泥後，探討強塑劑存在時漿體的流變行為。試驗結果顯示，添加飛灰可以有效降低水泥漿體黏度。當強塑劑加入後，也有類似效果，因為漿體流變行為深受吸附的影響，故本研究針對強塑劑的吸附行為與孔隙水溶液中離子濃度的變化加以探討。試驗結果發現添加飛灰使強塑劑發生吸附轉移，使水泥顆粒之吸附量上升。離子濃度試驗的量測結果發現，不同強塑劑會造成不同的離子濃度行為。萘磺酸基強塑劑在高劑量與飛灰取代下會降低鉀離子之釋放，但溶液中仍含有相當高的鈉離子。羧酸基強塑劑的加入對離子濃度並無太大影響，但在飛灰存在時會使鉀離子濃度降低。最後，以定量10 %石灰石粉末取代部分水泥時，試驗結果與前述結果類似，而黏度仍著隨飛灰取代量以及吸附量的增加而降低。

This study explored the rheological behaviors of the Portland cement pastes partly replaced by fly ash or limestone powders by volume in the presence of superplasticizers. Results showed that the fly ash reduced the viscosities of the cement pastes. Similar behaviors were found in the pastes with superplasticizers. Since the paste rheology is associated with the superplasticizer adsorption, this study also explored the changes in the superplasticizer adsorption and the ionic concentrations in pore solutions. Results further showed that the addition of fly ash increased the amount of adsorption on cement particles. The naphthalene-based superplasticizer reduced the potassium ion concentrations in pore solutions. However, the carboxylated superplasticizer did not alter the ion concentrations much. In the presence of fly ash, the potassium ion concentration was reduced. Finally, similar results were found when cement was replaced by 10% limestone powders. The viscosity and the superplasticizer adsorption of the pastes remained reduced by the addition of fly ash.

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