【摘要】 本文以乙二胺四乙酸二钠作为改性剂，通过焙烧还原法成功制备出改性CaAl-LDHs阻锈剂(CaAl-EDTA LDH),并探明了CaAl-EDTA LDH对水泥基材料宏观性能(流动度、凝结时间、力学性能)及微观性能(产物组成、水化热、孔结构)的影响规律。此外，成型了内埋钢筋的砂浆试件，设置了两种腐蚀模式(内掺氯盐+干湿循环、干湿循环),模拟测试不同掺量(0%、0.5%、1.0%、2.0%、4.0%,质量分数)CaAl-EDTA LDH对实际钢筋混凝土体系的防护效果。结果表明，掺量为0.5%和1.0%的CaAl-EDTA LDH会促进水泥矿物溶解，提高水化放热量，使砂浆早期强度提升。但是EDTA自身具有缓凝效果，当CaAl-EDTA LDH掺量为4.0%时，砂浆水化放热量及早期水化产物生成量严重降低，而28 d净浆总孔隙率增加了4%左右。腐蚀试验结果表明干湿循环模式下CaAl-EDTA LDH未表现出阻锈性能，而在双重腐蚀模式下，CaAl-EDTA LDH在经历90次干湿循环后仍对砂浆中的钢筋存在优异的防腐效果，但掺量应控制在1.0%～2.0%。本文开发的新型阻锈剂对延长钢筋混凝土寿命、提高结构耐久性具有参考意义。更多还原

【Abstract】 The modified CaAl-LDHs corrosion inhibitor(CaAl-EDTA LDH) was prepared by calcination reduction method with EDTA-2Na as modifier, and the effect of CaAl-EDTA LDH on the macro-properties(fluidity, setting time, mechanical properties) and micro-properties(product composition, hydration heat, pore structure) of cement-based materials was investigated. Besides, two corrosion modes were set up to simulate the protective effect of CaAl-EDTA LDH with different content(0%, 0.5%, 1.0%, 2.0%, 4.0%, mass fraction) on the embedded reinforced mortar specimens. The results show that the addition of 0.5% and 1.0% CaAl-EDTA LDH promotes the dissolution of cement minerals, increases the hydration heat release, and improves the early strength of mortar. However, EDTA has a retarding effect. When the content of CaAl-EDTA LDH is 4.0%, the hydration heat release and the formation of early hydration products of mortar seriously reduces, while the paste total porosity of 28 d increases by about 4%. Moreover, corrosion test results indicate that CaAl-EDTA LDH does not show corrosion resistance in dry-wet cycle mode, while it shows excellent corrosion resistance on reinforcement in mortar after 90 times dry-wet cycle under dual corrosion mode with the content controlled in 1.0%～2.0%. The new type of corrosion inhibitor in this paper has reference significance for prolonging service life of reinforced concrete and improving durability of structures.更多还原