混凝土表面喷涂类有机无机杂化抗碳化剂制备及性能  

Preparation and Properties of Organic-Inorganic Hybrid Anti-carbonation Agent for Spraying Concrete Surface

作　　者：叶梦煊 谷雷雷 张梅 王倩倩 YE Mengxuan;GU Leilei;ZHANG Mei;WANG Qianqian(College of Materials Science and Engineering,Nanjing Tech University,Nanjing 211816,China;Haiwei Engineering Construction Co.,Ltd.of FHEC of CCCC,Beijing 101119,China)

机构地区：[1]南京工业大学材料科学与工程学院,南京211816 [2]中交一公局海威工程建设有限公司,北京101119

出　　处：《材料导报》2024年第21期137-143,共7页Materials Reports

基　　金：国家自然科学基金(52072171)。

摘　　要：为提升混凝土的抗碳化能力,延长混凝土的使用寿命,本工作制备有机无机杂化抗碳化剂,研究其对砂浆力学性能、抗碳化性能和抗渗性能的影响,并进一步对有机无机杂化抗碳化剂与水泥石之间相互作用机理进行分析。结果表明:当有机无机杂化抗碳化剂中活性组分质量分数为1.2%时,喷涂该抗碳化剂的水泥净浆截面碳化面积比未喷涂组降低33.6%,吸水率比未喷涂组降低23.7%,总孔隙率从10.56%降为7.17%,喷涂组的渗透高度仅为空白组的58.6%。此外,喷涂该抗碳化剂后,试块的7 d抗压强度比未喷涂组提高6.1%。该配比下水泥净浆试块的X射线衍射、扫描电镜以及孔结构表征表明,有机无机杂化抗碳化剂的活性物质可以渗透进试块内部与水泥基材中氢氧化钙等发生反应,生成不溶性结晶物质填充孔隙与裂缝,并且提升水化硅酸钙的硅钙比和结晶性,从而提升混凝土的抗碳化能力及抗渗性。In order to improve the carbonation resistance and prolong the service life of concrete,this study prepared an organic-inorganic hybridanti-carbonation agent(OCCA)and investigated its effect on mechanical properties,anti-carbonation properties and impermeability of mortar.Furthermore,the interaction mechanism between OCCA and hardened cement pastes was analyzed.The results show that when the mass fraction of the reactive component of the self-designed OCCA is 1.2%,the carbonation area can be reduced by 33.6%compared with the blank group,the water absorption rate decreased by 23.7%,at the same time,the total porosity decreased from 10.56%to 7.17%,and the penetration height of the spray group is 58.6%of the blank group.Moreover,the 7-day compressive strength of the blocks coated with the OCCA increased by 6.1%compared to the blank group.At this ratio,the XRD and SEM analyses of the cement paste block reveal that the reactive components of OCCA can effectively infiltrate the cement paste and interact with the calcium hydroxide present in the concrete.This reaction gives rise to an insoluble crystalline substance that fills up the pores and cracks,so as to improve the carbonation resistance,water-resistance and impermeability of concrete.

关 键 词：有机无机杂化 渗透结晶 抗碳化 抗渗性 

分 类 号：TU528[建筑科学—建筑技术科学]