矿渣-高贝利特硫铝酸盐水泥抗硫酸盐侵蚀机理的研究

摘要/Abstract

摘要： 硫酸盐侵蚀是混凝土耐久性的一个重要影响因素,为进一步提高高贝利特硫铝酸盐水泥(HB-CSA)基混凝土的抗硫酸盐侵蚀性能,在HB-CSA中掺入粒化高炉矿渣(GBFS)以提高HB-CSA抗硫酸盐侵蚀性能。采用抗蚀系数来评价矿渣对HB-CSA砂浆抗硫酸盐侵蚀性能的影响,并结合X射线衍射分析法、热重分析法、压汞法、扫描电子显微镜等测试方法,从微观层次对抗硫酸盐侵蚀机理进行了研究。结果表明,矿渣可以提高HB-CSA的抗硫酸盐侵蚀性能,HB-CSA的抗蚀系数可提高至1.51。GBFS-HB-CSA体系在抗硫酸盐侵蚀过程中,矿渣颗粒对HB-CSA孔结构的填充细化起主要作用,SO^2-₄和Ca(OH)₂共同激发矿渣中Al₂O₃与SiO₂水化生成凝胶和钙矾石(AFt),凝胶和AFt填充在浆体孔隙中,细化了浆体孔径,使浆体结构密实,降低了离子渗透性,从而提高HB-CSA抗硫酸盐侵蚀的能力。

关键词: 高贝利特硫铝酸盐水泥, 矿渣, 硫酸盐侵蚀, 水化产物, 微观结构, 填充效应

Abstract: Sulfate attack is an important factor affecting the durability of concrete. In order to further improve the sulfate attack resistance of high belite sulfate-aluminate cement (HB-CSA) based concrete, the granulated blast-furnace slag (GBFS) was added into HB-CSA to improve the sulfate attack resistance of HB-CSA. Corrosion resistance coefficient was used to evaluate the effect of slag on the sulfate attack resistance of HB-CSA mortar. Combined with X-ray diffraction analysis, thermogravimetry, mercury injection, scanning electron microscope and other testing methods, the mechanism of sulfate attack resistance was studied from the microscopic level. The results show that slag can improve the sulfate attack resistance of HB-CSA, and its corrosion resistance coefficient increases to 1.51. In the process of GBFS-HB-CSA resistance to sulfate attack, slag particles play a major role in the filling and refining of the cement pore structure of HB-CSA. SO^2-₄ and Ca(OH)₂ jointly stimulate the hydration of Al₂O₃ and SiO₂ in the slag to produce gel and ettringite (AFt). The gel and AFt fill in the slurry pores to refine the pore size of the slurry, which makes the slurry structure dense and reduces the ionic permeability, thus improving the ability of HB-CSA to resist sulfate attack.

Key words: high belite sulfate-aluminate cement, slag, sulfate attack, hydration production, microstructure, filling effect

中图分类号:

TQ172.72

裴天蕊, 齐冬有, 邹德麟, 蔡永慧, 汪智勇, 郝禄禄, 王亚丽, 张钰, 刘洪印. 矿渣-高贝利特硫铝酸盐水泥抗硫酸盐侵蚀机理的研究[J]. 硅酸盐通报, 2023, 42(8): 2683-2691.

PEI Tianrui, QI Dongyou, ZOU Delin, CAI Yonghui, WANG Zhiyong, HAO Lulu, WANG Yali, ZHANG Yu, LIU Hongyin. Resistance Mechanism of Slag-High Belite Sulfate-Aluminate Cement to Sulfate Attack[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2683-2691.

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