高抗蚀胶凝材料的制备及其抗硫酸盐侵蚀性能研究

摘要/Abstract

摘要： 为了提高在城市污水处理系统服役的混凝土管道的抗硫酸盐侵蚀性能,本文对高抗蚀胶凝材料(HCRC)展开了系列研究。基于正交试验,以抗蚀系数为考核指标,优化矿粉、粉煤灰、硅灰和脱硫石膏替代水泥的比例,获得高抗蚀胶凝材料的最优配合比(HCRC1)。采用模拟污水浸泡法研究了HCRC1的抗硫酸盐侵蚀性能,并利用FTIR、XRD、TG-DSC、压汞法(MIP)和氮气吸附法(BJH)等测试分析了水化产物和孔结构的变化。结果表明,HCRC1由26%水泥、50%矿粉、15%粉煤灰、6%硅灰和3%脱硫石膏(均为质量分数)组成。随着在污水中浸泡时间的增加,试件抗压强度比(K_f)下降,将HCRC1浸泡在污水中100 d后,其K_f值比普通胶凝材料(NC)的高37.94%。此外,微观分析表明浸泡于污水的浆体中的Ca(OH)₂和C-S-H凝胶被腐蚀性离子部分消耗,侵蚀产物主要为石膏,其中HCRC1生成石膏比NC少。同时,与NC浆体相比,HCRC1浆体孔径更为细小,其中有害孔、少害孔向更小孔径转变,这有助于提高其抵抗腐蚀性离子侵蚀的能力。因此,所研制的高抗蚀胶凝材料具有高抗硫酸盐侵蚀性能,可用于混凝土污水管道。

关键词: 高抗蚀胶凝材料, 污水环境, 抗硫酸盐侵蚀, 抗压强度, 抗蚀系数, 孔结构

Abstract: In order to improve the sulfate resistance of concrete pipes in urban sewage treatment system, a series of researches on high corrosion resistant cementitious materials (HCRC) were carried out in this work. Based on the orthogonal test, the ratio of ground granulated blast furnace slag (GGBFS), fly ash (FA), silica fume (SF), and desulfurized gypsum (DG) to replace ordinary Potland cement (OPC) was optimized with the corrosion resistance coefficient as the evaluation index, and the optimal mix proportion of HCRC (HCRC1) was obtained. After that, the sulfate corrosion resistance of HCRC1 was studied by the simulated sewage immersion method, and then the changes of hydration products and pore structure were analyzed by FTIR, XRD, TG-DSC, MIP and BJH. Results indicate that the HCRC1 consists of 26%OPC, 50%GGBFS, 15%FA, 6%SF, and 3%DG (all are mass fraction). Moreover, the compressive strength ratio (K_f) of HCRC1 decreases with the curing age immersed in sewage increasing, and the K_f value of HCRC1 is 37.94%, higher than that of normal cementitious material (NC) after immersing in sewage for 100 d. Furthermore, the microscopic analysis shows that the Ca(OH)₂ and C-S-H gel generated in the pastes immersed in sewage are partially consumed by corrosive ions. The corrosion products are mainly gypsum, and HCRC1 produces less gypsum than NC. Further, HCRC1 pastes have smaller pore size compared with NC pastes, in which the harmful and less harmful pores change to smaller pore size, improving the ability of resisting penetration of corrosive ions. Consequently, the developed HCRC has high sulfate resistance and can be used in concrete sewage pipes.

Key words: high corrosion resistant cementitious material (HCRC), sewage environment, sulfate resistance, compressive strength, corrosion resistance coefficient, pore structure

中图分类号:

TU528.33

陈逸明, 林培桐, 李云龙, 刘锦红, 汪峻峰, 鲁刘磊. 高抗蚀胶凝材料的制备及其抗硫酸盐侵蚀性能研究[J]. 硅酸盐通报, 2021, 40(4): 1116-1127.

CHEN Yiming, LIN Peitong, LI Yunlong, LIU Jinhong, WANG Junfeng, LU Liulei. Preparation of High Corrosion Resistant Cementitious Materials and Its Sulfate Resistance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1116-1127.

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