氯离子含量对中高强混凝土抗压强度和耐久性的影响

摘要/Abstract

摘要： 为了更好、更安全地利用丰富的海砂资源,减缓河砂供应难题,通过大规模的试验研究了净化海砂中不同氯离子含量对C40~C70混凝土抗压强度、抗碳化性能、抗硫酸盐侵蚀性能、钢筋锈蚀程度、抗氯离子渗透性能及电化学性能的影响及机理。结果表明,当氯离子含量不高于0.150%(质量分数,下同)时,随着氯离子含量的增加,C40~C70混凝土的抗压强度提高并且后期抗压强度持续增长,同时C40~C70混凝土的抗碳化性能和抗氯离子渗透性能也有所提高。当氯离子含量不高于0.060%时,C40~C70混凝土的抗硫酸盐侵蚀性能增强,当氯离子含量不低于0.150%时,硫酸盐的侵蚀加剧。当氯离子含量不高于0.008%时,钢筋锈蚀会延缓,当氯离子含量不低于0.060%时,钢筋锈蚀会加速。

关键词: 净化海砂, 氯离子含量, 中高强混凝土, 抗压强度, 耐久性, 微观特征

Abstract: In order to make better and safer use of abundant sea sand resources and alleviate the problem of river sand supply, the effects and mechanisms of different chloride ion content in purified sea sand on the compressive strength, carbonation resistance, sulfate corrosion resistance, corrosion degree of steel bars, chloride ion penetration resistance and electrochemical properties of C40~C70 concrete were studied through large-scale experiments. The results show that when the chloride ion content is less than or equal to 0.150% (mass fraction, the same below), with the increase of chloride ion content, the compressive strength of C40~C70 concrete increases and the later compressive strength continues to increase. At the same time, the carbonation resistance and chloride ion penetration resistance of C40~C70 concrete are also improved. When the chloride ion content is less than or equal to 0.060%, the sulfate corrosion resistance of C40~C70 concrete improves. When the chloride ion content is higher than or equal to 0.150%, the sulfate erosion aggravates. When the chloride ion content is less than or equal to 0.008%, the corrosion of steel bars delays. When the chloride ion content is higher than or equal to 0.060%, the corrosion of steel bars accelerates.

Key words: purified sea sand, chloride ion content, medium-high strength concrete, compressive strength, durability, microscopic characteristic

中图分类号:

TU528

张晨剑, 谢嘉磊, 王志豪, 方思怡, 巴明芳. 氯离子含量对中高强混凝土抗压强度和耐久性的影响[J]. 硅酸盐通报, 2023, 42(7): 2382-2391.

ZHANG Chenjian, XIE Jialei, WANG Zhihao, FANG Siyi, BA Mingfang. Effect of Chloride Ion Content on Compressive Strength and Durability of Medium-High Strength Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2382-2391.

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