固化海水离子裂缝自修复剂制备及其在硬化水泥浆体中的作用机理  

Seawater-ion-bound Self-healing Agents and the Working Mechanism in Cracked Hardened Cement Paste

作　　者：黄浩良 吴欣桐 刘昊 彭楚汗 胡捷[1,2] 殷素红 韦江雄[1,2] 余其俊 HUANG Haoliang;WU Xintong;LIU Hao;PENG Chuhan;HU Jie;YIN Suhong;WEI Jiangxiong;YU Qijun(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;Guangdong Low Carbon Technologies Engineering Centre for Building Materials,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]广东省建筑材料低碳技术工程技术研究中心,广州510640

出　　处：《硅酸盐学报》2021年第8期1619-1630,共12页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划项目(2017YFB030309904);国家自然科学基金项目(51602050,51872097);硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2020-09);先进土木工程材料教育部重点实验室(同济大学)开放基金(202005)。

摘　　要：设计了可固化海水腐蚀性离子并加速裂缝愈合的新型自修复剂,并用于制备自修复功能骨料,同时对其对混凝土中裂缝的修复机制进行探讨。结果表明:自修复剂对400μm宽裂缝24h的表面愈合率>80%,愈合速度提高3倍;在裂缝口处快速形成并使裂缝愈合的沉淀物主要为水镁石和方解石,在破裂功能骨料内部的自修复产物则为羟钙石、方解石、Friedel盐的扩散速度和沉淀物热力学平衡常数共同决定了自修复产物矿相的空间分布和矿相演变。A self-healing agent that can bind aggressive seawater ions and accelerate the healing process was developed, which was encapsulated as artificial aggregates. The closure ratio of a 400-μm-wide crack is 80% after self-healing for 24 h in seawater by using the self-healing agent, which is 4 times greater than that in referenced specimens. The reaction products formed at the crack mouth are mainly brucite and calcite, while in the aggregates intersected by the crack there are portlandite, calcite, Friedel’s salt, ettringite and hydrotalcite, indicating that the aggressive ions can be bound by the self-healing agent. The mineralogy and distribution characteristic of the reaction products are dependent on the diffusion of the ions dissolving from the agents and the thermodynamic equilibrium constants of the reaction products.

关 键 词：裂缝自修复 离子固化 快速愈合 海洋环境 水泥混凝土 

分 类 号：TQ175[化学工程—硅酸盐工业]