Abstract
In order to study the frost resistance of magnesium cement composite sheets, the effects of freeze-thaw cycles on the bending properties of glass fiber reinforced basic magnesium sulfate cements blended with mineral admixtures and glass fiber reinforced chlorine were studied by freeze-thaw test method. Magnesium silicate cement is compared. The composition and microstructure of the hydration products of the board before and after freezing and thawing were analyzed by XRD and SEM. The results show that before the 128 freeze-thaw cycles, the flexural strength of the undoped composite sheet is 8.2%, 7.3% and 9.1% higher than the initial strength of the slag, fly ash and silica fume board, respectively. When the number of freeze-thaw cycles reaches 160, the strength retention rate of composite sheets with various ratios has been reduced to less than 75%, and the test pieces fail; the number of freeze-thaw cycles for failure of the magnesium oxychloride cement-based board is about 150 times, The number of basic magnesium sulfate cements is almost the same This indicates that in the freeze-thaw test, the failure of the specimen may be caused only by physical damage, and the number of times depends on the strength of the previous period.
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