本研究將依據鎂鋁氧化物可吸附陰離子形成鎂鋁層狀雙氫氧化物之概念，探討鎂鋁氧化物應用於土木材料中之可行性。首先將鎂鋁層狀雙氫氧化物煅燒製成鎂鋁氧化物，再將其添加於水泥砂漿中，分析此種摻料是否能達到吸附氯離子之功能性。本研究規劃兩種不同氯離子含量，並利用海砂作為細粒料之配比，拌合後即進行相關試驗，包括氯離子含量及抗壓強度試驗，以探討添加鎂鋁氧化物對水泥砂漿中氯離子之吸附能力，同時，建議可使鎂鋁氧化物有效吸附水泥砂漿中氯離子之拌製方式。為評估鎂鋁氧化物應用於水泥砂漿之適用性，將試驗水泥砂漿於添加鎂鋁氧化物後之流度、抗壓強度及新拌及硬固水泥砂漿氯離子含量等，並由試驗結果加以分析比較，同時探討鎂鋁氧化物於水泥砂漿中之吸附能力及最有效之應用方式。此外，利用掃描式電子顯微鏡及元素光譜分析儀觀測鎂鋁氧化物及鎂鋁層狀雙氫氧化物，其微結構和內部元素成份含量與分佈，同時配合進行熱重量分析試驗，以燒失量多寡分析鎂鋁層狀雙氫氧化物煅燒前後及吸附氯離子前後之成份含量差異，最後利用雷射粒徑分析儀量測實驗室製備之鎂鋁氧化物粒徑分佈，瞭解其顆粒是否有機會可以填入毛細孔隙中並吸附其中之Cl-陰離子。

With the property of anion exchange reaction, Mg-Al layered double hydroxides (MgAl-LDHs) can be used as chloride arrestors in cement mortars. MgAl-LDHs can be transformed to Mg-Al oxides when they are calcined at a high temperature of 500oC. The resulting Mg-Al oxides can be further intercalated by some other aggressive anions to become MgAl-LDHs. In this study, the feasibility of using Mg-Al oxides as chloride arrestors in cement mortars is investigated and thus presented. In order to evaluate the effects of Mg-Al oxides on the microstructure and properties of cement mortars, the flow value, compressive strength and chloride content of cement mortars were determined. In addition, measurements of SEM, EDS, TGA and particle size analysis were performed to characterize the microstructures, chemical compounds and particle size distributions of MgAl-LDHs and Mg-Al oxides, respectively. Finally, an effective way of enhancing the effects of Mg-Al oxides on the reduction of chloride content in cement mortars is proposed here.

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