探討添加飛灰於斷面補修用之聚合物水泥砂漿的益處

DISCUSS THE BENEFITS OF ADDING FLY ASH TO POLYMER CEMENT MORTAR FOR PATCH REPAIR

高玉荃(Yu-Chuan Kao) ； 邱建國(Chien-Kuo Chiu) ； 上田隆雄(Takao Ueda)

《中國土木水利工程學刊》 33卷5期 (2021/09) Pp. 367-377

https://doi.org/10.6652/JoCICHE.202109_33(5).0004

摘要

當受鹽害侵蝕之鋼筋混凝土建築物被斷面補修後，因混凝土和斷面補修材料間的氯離子濃度差異，可能導致混凝土中的鋼筋被加速腐蝕。本研究研擬將飛灰添加於市售之聚合物水泥砂漿補修材料內，探討飛灰改善新舊材料介面處之氯離子傳遞問題。據結果表示，斷面補修後，使用聚合物水泥砂漿會使氯離子選擇從阻抗小之混凝土部分進入，而加速混凝土部分之侵蝕，但添加飛灰可降低補修材料之阻抗來減緩此問題。其次，以飛灰取代部分水泥之方式探討不同比例之SBR對水泥砂漿補修材料之影響。發現飛灰與SBR混合使用時，降低SBR之使用量亦可達到與高含量SBR有差不多之耐久性能和耐候性能，亦可降低補修材料之成本。

關鍵字

斷面修復法 ； 聚合物水泥砂漿補修材料 ； 飛灰 ； 氯離子

並列摘要

When the reinforced concrete corroded by chloride ions are repaired of the patch repair method, the steel bars in concrete will accelerate corrosion due to the different concentrations of chloride ion between the concrete and the patch repair materials. In this study, propose adding fly ash to commercial products of polymer cement mortar used for patch repair materials to explore the problem of fly ash can improve the chloride ion transmission at the interface between the concrete and the patch repair materials. According to the results, components after the patch repair, using polymer cement mortar will cause the chloride ions to choose to enter from the concrete with low-impedance, making concrete accelerate corrosion. But adding fly ash can reduce the resistance of the patch repair material to alleviate this problem. Secondly, the effect of different proportions of SBR on patch repair materials is discussed by replacing part of cement with fly ash. It was found that when fly ash and SBR are mixed using, reducing the amount of SBR can achieve similar durability and weather resistance to high-content SBR, and can also reduce the cost of patch repair materials.

並列關鍵字

patch repair material ； SBR ； fly ash ； chloride ion