LDHs改性偏高岭土基地聚物涂料对混凝土耐久性的影响研究  

Effect of LDHs Modified MK-based Geopolymer Coating on Durability of Concrete

作　　者：陈宇轩[1] 水中和[1] 陈伟[1] 段平[1,2] 陈国玮[1] 

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]中国地质大学材料与化学学院,武汉430074

出　　处：《硅酸盐通报》2015年第7期1968-1973,共6页Bulletin of the Chinese Ceramic Society

摘　　要：本文提出一种新型偏高岭土基地聚物无机防护涂料。该涂料的基体为偏高岭土基地质聚合物,其有界面结合力强、抗渗性优异的特点,通过选择合适的工艺,加入少量的LDHs新型无机插层材料,以提高该涂料对混凝土的抗碳化性能和抗氯离子渗透性能。通过结合XRD、TG-MS等测试分析技术对该涂料提高混凝土耐久性的微观机理进行了探讨。研究结果表明,此种涂料可以显著提高被涂覆混凝土的抗碳化能力和抗氯离子侵蚀性能,LDHs材料主要通过煅烧处理后的结构重建过程和离子交换实现对碳酸根和氯离子的吸附。Metakaolin-based geopolymer,which has strong interface cohesion and great resistance to penetration,is adopted as the coating binder with a reasonable gradation. Foam suppressant and dispersant are also added and appropriate process is selected to produce the high performance and multifunctional compound protective coating. The impact of the coating on the carbonation and chloride resistance of concrete are studied and combination of XRD and TG analysis tests are employed to explore the mechanism. The experimental results indicate that the coating can dramatically improve the carbonation and chloride resistance of concrete and calcined LDHs adsorb CO2-3and Cl-mainly through the process of structure reconstruction and ion exchange.

关 键 词：防护涂料 LDHs材料 偏高岭土 地聚物 混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]