Study on Curing Mechanism of Nitrite Type Cl- Curing Agent in Sea Sand Concrete
MING Yang1,2,3,4, XIAO Dengkai1,2,4, LI Ling1,2,3,4,*, LI Xinheng1,2,4, ZHU Qiyang1,2,4, HUANG Dengke1,2,4, REN Hao1,2,4
1 College of Civil Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China 2 Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin 541004, Guangxi, China 3 Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, Guilin 541004, Guangxi, China 4 Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials, Guilin 541004, Guangxi, China
Abstract: The large amount of chloride ions contained in sea sand is the main bottleneck hindering its application in cement-based materials. In this work, three materials, NaAlO2, Ca(OH)2, and Ca(NO2)2, were used to prepare a new nitrite-type chloride ion curing agent (NO2-ClCA) by hydrothermal method. Through adding this agent in the cement-based materials, it showed a good chloride ion curing ability. Finally, the mechanism of NO2-ClCA was analyzed using XRD, SEM and other methods. The results showed that the optimal method to get NO2-ClCA is with the mass fraction of NaAlO2 and Ca(NO2)2 of 15% and 6%, respectively, the stirring rate of 30 r/s, and the reaction temperature of 60 ℃. By adding NO2-ClCA to cement-based materials, chloride ion curing of 1.33 mg/g can be achieved. The main components of NO2-ClCA are NO2--AFm and C3AH6. The curing effect of NO2-ClCA on chloride ions is mainly chemical curing. Specifically, NO2--AFm reacts with free Cl- in the pore solution to form Friedel's salt, which improves the chemical binding capacity of the system. C3AH6 participates in the anion replacement reaction and supplements the calcium and aluminum phases in the system, which can promote the conversion of C-S-H gel to C-(A)-S-H gel to improve the physical adsorption capacity of the system.
1 Zou F, Zhang M, Hu C, et al. Chemical Engineering Journal, 2021, 412, 128569. 2 Deng Z C, Zhao L Z, Lian Y H, et al. Materials Reports, 2021, 35(12), 12070(in Chinese). 邓宗才, 赵连志, 连怡红. 材料导报, 2021, 35(12), 12070. 3 Zhou S W, Li Q P. Science & Technology Review, 2020, 38(14), 17(in Chinese). 周守为, 李清平. 科技导报, 2020, 38(14), 17. 4 Wang S J, Liu X Q, Dai Q F, et al. Marine Geology & Quaternary Geology, 2003, 23(3), 7(in Chinese). 王圣洁, 刘锡清, 戴勤奋, 等. 海洋地质与第四纪地质, 2003, 23(3), 7. 5 Liu J, Jiang Z, Zhao Y, et al. Materials, 2020, 13(17), 3900. 6 Chen L, Li S G, Zhang H, et al. Journal of Hohai University(Natural Sciences), 2022, 50(3), 104, (in Chinese). 陈莉, 李沙罡, 张欢, 等. 河海大学学报(自然科学版), 2022, 50(3), 104. 7 Liu Y M, Yang L, Rao F, et al. Bulletin of the Chinese Ceramic Society, 2023, 42(9), 3059(in Chinese). 刘玉美, 杨浪, 饶峰, 等. 硅酸盐通报, 2023, 42(9), 3059. 8 Zeng L, Yu W, Mo Z, et al. China Ocean Engineering, 2023, 37(2), 272. 9 Qin F C, Qi H Q, Meng Z B, et al. Materials Reports, 2022, 36(6), 158(in Chinese). 秦芳诚, 亓海全, 孟征兵, 等. 材料导报, 2022, 36(6), 158. 10 Li X L. Fujian Building Materials, 2020(5), 29(in Chinese). 李秀琳. 福建建材, 2020(5), 29. 11 Mei K Z, Lin X Y, Shu H B, et al. Concrete, 2023(1), 82(in Chinese). 梅侃泽, 林鑫源, 舒海斌, 等. 混凝土, 2023(1), 82. 12 Liao Q, Yu J, Shi T, et al. Composite Structures, 2023, 320, 117183. 13 Sui S Y. Chloride ion transport and adsorption mechanism in limestone powder-calcined clay-cementitious materials. Ph. D. Southeast University, China, 2020(in Chinese). 眭世玉. 氯离子在石灰石粉-煅烧黏土-水泥基材料中的传输及吸附机理研究. 博士学位论文, 东南大学, 2020. 14 Zhang T, Geng J, Liu G J, et al. Bulletin of the Chinese Ceramic Society, 2022, 41(6), 2063, (in Chinese). 张涛, 耿健, 柳根金, 等. 硅酸盐通报, 2022, 41(6), 2063. 15 Liu Q, Zhang J, Su Y, et al. Journal of Wuhan University of Technology-Materials Science Edition, 2021, 36, 871. 16 Schade T, Bellmann F, Middendorf B. Cement and Concrete Research, 2022, 153, 106706. 17 Wang J, Hu Z, Chen Y, et al. Cement and Concrete Research, 2022, 157, 106811. 18 Zhu X, Richardson I G. Cement and Concrete Research, 2023, 168, 107156.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2025, Vol. 39 
