電化學技術用於平面去除水泥砂漿鹽分之基礎研究

游雁斐(Yen-Fei Yu)

指導教授 ： 李釗

國立中央大學/工學院/土木工程學系/碩士(2015年)

摘要

本研究運用電化學技術設計一套適用於處理孔隙性材料建築物鹽害問題的通電模組，希望在電場驅動力作用下將誘發建築孔隙材料鹽害問題的可溶性鹽類移除，並將適當的離子送入試體中，探討修復或降低孔隙材料受到可溶性鹽類侵蝕的成效，以作為後續研究及實務應用之基礎。
本研究施加電場為定電流密度模式，並分別以1 N氫氧化鋰水溶液及1 N氫氧化鈉水溶液作為陽極與陰極電解槽電解液。於試體配比條件相同下，藉由監測電解槽內鈉、鋰及氯離子含量與通電歷時及累積電荷量的關係，分析施加不同電場強度及不同陰陽極電解槽間距配置對離子傳輸的影響，並於通電結束，分析試體內殘餘游離態離子含量及分佈趨勢。結果顯示，無論施加的電場強度大小，當陰陽極電解槽間距增長後，系統阻抗值皆有變大的現象，單位電量所能移出的氯離子含量也隨之增加。試體中的氯離子及鈉離子的移出百分率隨著施加定電流密度增加而增加，且離子移出的累積量與通電歷時有良好的相關性。當施加定電流密度為5 A/m2時，較有效可移除試體內氯離子及鈉離子的電解槽間距可達到6 cm至9 cm；當施加定電流密度7 A/m2時，較有效率可移除試體內氯離子及鈉離子的電解槽間距配置可超過9 cm。

關鍵字

電化學技術 ； 建築孔隙材料 ； 鹽害 ； 可溶性鹽類 ； 電解槽間距

並列摘要

This research uses electrochemical techniques to design a set of electrical module which suitable to treat salt damage problem of porosity material building. Hoping the driving force of the electrical field will remove the soluble salts in the building porosity material and send appropriate ions into the material. To investigate the performance of repair or lower the salt damage problem of porosity material, as a basis for further research and practical application.
The applied electrical field of this research is constant current density pattern. 1N LiOH．H2O and 1N NaOH used as anolyte and catholyte solutions, respectively. At the same condition of specimen mix design, by monitoring the relationship between the concentration of sodium, lithium and chloride ions and the electrical time and the accumulated quantity of electric charge, to analysis the ion migration effect of applied electrical field strength and the distance between electrodes. After electrifying, analysis the residual free ion content and distribution trend in specimen. Results show that for all the applied electric field strength, when the distance between electrodes increases, the system resistance value becoming larger and the removable amount of chloride ions in specimen increasing. The removed amount of chloride and sodium ions in specimen increases with increasing applied constant current density. The relationship between the removed cumulative ion amount and electrifying duration has a good correlation. When applying a constant current density of 5 A/m2, the effective electrode distance for removing chloride and sodium ions in specimen is 6 cm to 9 cm. When applied at a constant current density of 7 A/m2, the effective electrode distance can exceed 9 cm.

並列關鍵字

Electrochemical technology ； building porosity material ； salt damage ； soluble salts ； electrode distance

參考文獻

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