EDTA改性CaAl-LDH对水泥基材料性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (5): 1578-1588.

所属专题：水泥混凝土

EDTA改性CaAl-LDH对水泥基材料性能的影响

袁慧慧^1,2, 秦兴¹, 孙钰璇¹, 叶建雄¹, 陈梦竹³, 吴芳¹, 蔡渝新⁴, 余林文¹

1.重庆大学材料科学与工程学院,重庆 400045;
2.江苏尼高科技有限公司,常州 213141;
3.中山大学材料科学与工程学院,广州 510275;
4.上海交通大学船舶海洋与建筑工程学院,海洋国家重点实验室,上海 200240

收稿日期:2023-01-09 修订日期:2023-03-19 出版日期:2023-05-15 发布日期:2023-06-01
通信作者: 叶建雄,高级工程师。E-mail:13983255577@163.com
作者简介:袁慧慧(1997—),女,硕士研究生。主要从事钢筋混凝土耐久性的研究。E-mail:1747011687@qq.com
基金资助:
重庆市留学人员回国创业创新支持计划(cx2021083)

Effect of EDTA Modified CaAl-LDH on Properties of Cement-Based Materials

YUAN Huihui^1,2, QIN Xing¹, SUN Yuxuan¹, YE Jianxiong¹, CHEN Mengzhu³, WU Fang¹, CAI Yuxin⁴, YU Linwen¹

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;
2. Jiangsu Nigao Science and Technology Co., Ltd., Changzhou 213141, China;
3. School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;
4. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2023-01-09 Revised:2023-03-19 Online:2023-05-15 Published:2023-06-01

摘要/Abstract

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。

关键词: 层状双金属氢氧化物, 乙二胺四乙酸二钠, 改性, 阻锈剂, 钢筋混凝土, 氯盐

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.

Key words: layered double hydroxide, EDTA-2Na, modification, corrosion inhibitor, reinforced concrete, chloride

中图分类号:

TU528

袁慧慧, 秦兴, 孙钰璇, 叶建雄, 陈梦竹, 吴芳, 蔡渝新, 余林文. EDTA改性CaAl-LDH对水泥基材料性能的影响[J]. 硅酸盐通报, 2023, 42(5): 1578-1588.

YUAN Huihui, QIN Xing, SUN Yuxuan, YE Jianxiong, CHEN Mengzhu, WU Fang, CAI Yuxin, YU Linwen. Effect of EDTA Modified CaAl-LDH on Properties of Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(5): 1578-1588.

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EDTA改性CaAl-LDH对水泥基材料性能的影响

Effect of EDTA Modified CaAl-LDH on Properties of Cement-Based Materials

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