Preparation and Properties of Organic-Inorganic Hybrid Anti-carbonation Agent for Spraying Concrete Surface
YE Mengxuan1, GU Leilei2, ZHANG Mei2, WANG Qianqian1,*
1 College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China 2 Haiwei Engineering Construction Co., Ltd. of FHEC of CCCC, Beijing 101119, China
Abstract: 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.
通讯作者:
*王倩倩,南京工业大学材料科学与工程学院副教授、硕士研究生导师。2015年于南京工业大学博士毕业。目前主要从事低碳胶凝材料、冶炼渣资源化利用、材料多尺度计算模拟和防水材料等方面的研究工作。在Cement and Concrete Research、Applied Surface Science、Corrosion Science、Construction and Building Materials和Journal of Physical Chemistry等学术期刊上发表学术论文多篇。qqwang@njtech.edu.cn
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2024, Vol. 38 
