钙矾石
石膏
材料科学
灰浆
腐蚀
硫酸盐
水泥
微观结构
热重分析
镁
冶金
复合材料
化学工程
硅酸盐水泥
工程类
作者
Shan Luo,Zhen Wang,Qingnan Gong,Dehui Wang
出处
期刊:Magazine of Concrete Research
[Thomas Telford Ltd.]
日期:2022-07-01
卷期号:74 (13): 672-681
标识
DOI:10.1680/jmacr.21.00095
摘要
To clarify the role of temperature in thaumasite formation of cement mortar under magnesium sulfate solution at two different temperatures, the corrosion products and microstructure of cement-based materials with different amounts and particle sizes of limestone powder were quantitatively analysed by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and energy-dispersive spectroscopy. At 5°C, the main corrosion products of cement mortar were gypsum and thaumasite. At 20°C, the main corrosion products of cement mortar were gypsum and ettringite. When the temperature increased from 5°C to 20°C, the contents of ettringite, thaumasite and gypsum changed from 0.3, 12.3 and 64.6% to 4.6, 0 and 57.0%, respectively. The formation of thaumasite was the combination of direct reaction with ettringite transformation. The incorporation of limestone powder accelerated the corrosion of mortars, and the change coefficient of compressive strength of mortars decreased from 100% to 47.3% when its content increased from 0% to 30%. Low temperature and incorporation of finer limestone powder enhanced the corrosion of magnesium sulfate solution.
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