Preparation of High Corrosion Resistant Cementitious Materials and Its Sulfate Resistance

Abstract

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

CLC Number:

TU528.33

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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