DAP超分子水凝胶驱动自修复水泥基材料  

DAP Supramolecular Hydrogel Driven Self-Healing Cement-Based Materials

作　　者：陈伟[1] 李玥[1,2] 刘翔 唐焱杰[1,2] 唐佩 CHEN Wei;LI Yue;LIU Xiang;TANG Yanjie;TANG Pei(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《硅酸盐通报》2022年第5期1502-1509,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51972248,52072279);湖北省自然科学基金计划(ZRMS2020001673);深圳市科技计划项目协同创新专项(CJGJZD20200617102601003);中央高校基本科研业务费专项资金资助(WUT:2021IVA102)。

摘　　要：为了延长混凝土的使用寿命,发展了一种2,6-二[N-(羧乙基羰基)氨基]吡啶(DAP)超分子水凝胶驱动自修复水泥基材料和诱导羟基磷灰石自修复技术。DAP超分子水凝胶通过负载NH_(4)H_(2)PO_(4),在碱性条件下实现修复剂的智能化响应释放。将负载修复剂的DAP超分子水凝胶和中空玻璃管复合制备自修复构件,并开展了裂缝修复和护筋性能试验。结果表明:经过28 d的修复,0.592 mm宽的裂缝表面被修复,修复产物为羟基磷灰石;加入修复构件后,能够减缓钢筋锈蚀。在裂缝处,自修复成分释放后生成的修复产物使得裂缝的底部被填堵,阻隔了有害离子和气体的入侵通道。In order to prolong the service life of concrete,a 2,6-bis[N-(carboxyethyl carbonyl)amino]pyridine(DAP)supramolecular hydrogel driven self-healing cement-based material and hydroxyapatite self-healing technology were developed.In alkaline environment,the DAP supramolecular hydrogel loaded with NH_(4)H_(2)PO_(4)can realize the releasing of repair agent intelligently.DAP supramolecular hydrogel loaded with repair agent was encapsulated in a hollow glass tube and used to prepare self-healing component,and experiments of healing crack and rebar protection were carried out.The results show that the crack surface with a width of 0.592 mm is repaired after 28 d of healing.The healing product is hydroxyapatite.The self-healing component delays the rebar corrosion.The repair agent is released at the cracks and the generated healing products fill the cracks,thus blocking the intrusion channels of hazardous ions and gas.

关 键 词：水泥 裂缝 自修复 羟基磷灰石 超分子水凝胶 钢筋锈蚀 

分 类 号：TQ172[化学工程—水泥工业]