内掺白云石水泥基材料抗硫酸盐侵蚀性能

摘要/Abstract

摘要： 为考察白云石对水泥基材料抗硫酸盐侵蚀性能的影响,本文采用10%、20%、30%(质量分数,下同)白云石掺入水泥净浆与水泥砂浆试件中,在低温条件下浸泡于5%硫酸镁和5%硫酸钠溶液中,并进行硫酸盐侵蚀试验。定期观察试件的宏观形貌变化,并定量分析其侵蚀产物。测定水泥砂浆试件抗折强度与抗压强度并进行宏观分析,以此得出不同种类硫酸盐对试件生成碳硫硅钙石的影响。采用热力学模拟探究白云石对水泥胶凝体系产物的影响。结果表明:当白云石掺量为10%~20%时,能抑制水泥基材料中碳硫硅钙石的生成,水泥基材料的抗硫酸盐侵蚀性能有较大提高,水泥砂浆试件抗折强度有明显改善,这与热力学模拟结果基本一致。

关键词: 白云石, 水泥基材料, 硫酸盐, 热力学分析, 定量分析, 碳硫硅钙石

Abstract: In order to investigate the effect of dolomite on the sulfate resistance of cement-based materials, the cement paste specimens and cement mortar specimens mixed by 10%, 20%, 30% (mass fraction, the same as below) dolomite were soaked in 5% MgSO₄ solution and 5% Na₂SO₄ solution at low temperature, and sulfate attack test was carried out. Changes of the macroscopic morphology of specimens were observed regularly, and the erosion products were quantitatively analyzed. Flexural strength and compressive strength of cement mortar specimens were measured for macroscopic analysis, and the effects of different types of sulfates on the formation of thaumasite were obtained. At the same time, the effect of dolomite on the products of cement cementitious system was investigated by thermodynamic simulation. The results show that when the dolomite content is 10%~20%, the formation of thaumasite is inhibited, the sulfate resistance of cement-based materials is greatly improved, and the flexural strength of cement mortar specimens is significantly improved, which is consistent with the result of thermodynamic simulation.

Key words: dolomite, cement-based material, sulfate, thermodynamic analysis, quantitative analysis, thaumasite

中图分类号:

TU528

张超, 温勇, 李宇航, 李承诺, 封彦羽, 赵瑞翔. 内掺白云石水泥基材料抗硫酸盐侵蚀性能[J]. 硅酸盐通报, 2023, 42(7): 2317-2325.

ZHANG Chao, WEN Yong, LI Yuhang, LI Chengnuo, FENG Yanyu, ZHAO Ruixiang. Sulfate Attack Resistance of Dolomite Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2317-2325.

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