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硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (5): 1622-1633.DOI: 10.16552/j.cnki.issn1001-1625.2024.1195

• 水泥混凝土 • 上一篇    下一篇

用于腐蚀保护的NO-2-LDHs自愈微胶囊的制备及性能研究

田沛丰, 温勇, 郭晓琦, 林海孟   

  1. 新疆大学建筑工程学院,乌鲁木齐 830047
  • 收稿日期:2024-10-10 修订日期:2024-12-24 发布日期:2025-05-20
  • 通信作者: 温 勇,教授。E-mail:wenyong_9731@126.com
  • 作者简介:田沛丰(1997—),男,硕士研究生。主要从事自修复混凝土的研究。E-mail:107552201616@stu.xju.edu.cn
  • 基金资助:
    自治区科技计划项目重点研发专项(2022B03034-2);国家自然科学基金(52168036);新疆维吾尔自治区“天山英才”科技创新领军人才项目(2023TSYCLJ0006)

Preparation and Properties of NO-2-LDHs Self-Healing Microcapsules for Corrosion Protection

TIAN Peifeng, WEN Yong, GUO Xiaoqi, LIN Haimeng   

  1. School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, China
  • Received:2024-10-10 Revised:2024-12-24 Online:2025-05-20

摘要: 针对混凝土易开裂、难修复,裂后钢筋锈蚀快的工程难题,本文采用锐孔固浴法制备了以桐油(TO)为芯材,海藻酸钠(SA)和亚硝酸改性镁铝水滑石(NO-2-LDHs)为壁材的微胶囊。以包覆率为响应指标,通过响应面分析,对不同TO和SA的质量比、SA浓度及乳化剂浓度这3个因素进行优化。测试了钢筋的极化曲线,并对比了掺加0%和1%(质量分数)微胶囊的砂浆试件在干燥养护(干养)和浸水养护(湿养)条件下的强度恢复率。结果表明:当TO和SA的质量比为9:1、SA浓度为1.69%(质量分数)、十二烷基苯磺酸钠(SDBS)浓度为0.95%(质量分数)时,微胶囊对TO的最大包覆率为74.03%;制备的微胶囊具有一定的缓蚀效果,当微胶囊掺量为溶液质量的6%时,缓蚀效率为93.35%;自修复实验结果表明,掺入微胶囊可以显著提高砂浆试件的抗压强度恢复率,干养试件的28 d恢复率(80%)高于湿养试件(76%)。

关键词: 微胶囊, 缓蚀剂, 水滑石, 桐油, 水泥基材料, 自修复

Abstract: Aiming at the engineering problem of concrete easy to crack, difficult to repair, and fast corrosion of reinforcement after cracking, microcapsules with tung oil (TO) as the core material, sodium alginate (SA) and nitrite-modified magnesium-aluminum hydrotalcites (NO-2-LDHs) as the wall material were prepared in this paper by using the sharp-pore solid-bath method. Three factors, namely, different TO and SA mass ratios, SA concentration, and emulsifier concentration were optimized by response surface analysis using the encapsulation rate as the response index. The polarization curves of the reinforcement were tested and the strength recovery rates of mortar specimens with microcapsules dosed at 0% and 1% (mass fraction) were compared under dry and wet cured conditions. The results show that the maximum encapsulation rate of microcapsules on TO is 74.03% when the mass ratio of TO and SA is 9:1, the concentration of SA is 1.69% (mass fraction), and the concentration of sodium dodecyl benzene sulfonate (SDBS) is 0.95% (mass fraction). The prepared microcapsules have a certain degree of corrosion inhibition effectiveness, and the efficiency of corrosion inhibition at 6% dosing of solution mass is 93.35%. The results of self-repair experiments show that microcapsules can significantly improve the compressive strength recovery rate of mortar specimens, and the 28 d recovery rate of dry cured specimens (80%) is higher than that of wet cured specimens (76%).

Key words: microcapsule, corrosion inhibitor, hydrotalcite, tung oil, cement-based material, self-healing

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