Alkali-activated slag cementitious materials (AASCMs) exhibit fast hardening, early strength development, high strength, and low carbon content, making them suitable for repairing damaged concrete. However, the bonding performance of the repaired interface and the impermeability of the repaired specimens require further evaluation. Accordingly, this study performed splitting tensile, water penetration, chloride ion penetration, and microanalysis tests on ordinary concrete specimens repaired with AASCMs. The results demonstrated that epoxy resin and cement mortar improved the interfacial bonding strength, water permeability, and chloride ion permeability of the alkali-activated slag cementitious material-Portland cement (AASCM-PC) specimens. The rectangular mortise joint and S-shaped interface improved the interfacial bonding strength and water permeability of the AASCM-PC specimens but slightly reduced their chloride ion permeability. Compared with ordinary concrete, AASCM has fewer harmful voids and denser microstructure, improving the impermeability of the repaired specimens.

中文翻译：

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界面剂和模板对碱矿渣胶凝材料修复普通混凝土粘结性能和抗渗性能的影响


碱活化矿渣胶凝材料（AASCM）具有快速硬化、早期强度发展、高强度和低碳含量等特点，适合修复受损混凝土。但修复界面的粘结性能和修复试件的抗渗性能还需要进一步评估。因此，本研究对用 AASCM 修复的普通混凝土试件进行了劈裂拉伸、水渗透、氯离子渗透和微量分析测试。结果表明，环氧树脂和水泥砂浆提高了碱活化矿渣胶凝材料-波特兰水泥（AASCM-PC）试件的界面粘结强度、透水性和氯离子渗透性。矩形榫接和S形界面提高了AASCM-PC试样的界面结合强度和透水性，但略微降低了其氯离子渗透性。与普通混凝土相比，AASCM具有更少的有害空隙和更致密的微观结构，提高了修复试件的抗渗性。