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通过将内掺不同种类和不同质量分数二水石膏的水泥-石灰石粉净浆和胶砂试件在(5±1)℃的低温条件下长期浸泡,并定期观测试件外观形貌与抗压强度变化,同时对净浆试件取样进行X射线衍射和Fourier红外光谱分析,研究了石膏掺量对水泥基材料碳硫硅钙石(TSA)型硫酸盐破坏的影响及破坏机理。结果表明:当净浆试件中石膏掺量≥10%时发生了TSA型硫酸盐破坏,而石膏掺量为7.0%和3.5%的净浆试件均未发生破坏;水泥基材料中的石膏是否会引起TSA型硫酸盐破坏与水泥基材料中所用水泥的铝酸三钙含量有关。
Through long-term immersion of cement-limestone powder concrete and mortar mixed with different types and different mass fractions of dihydrate gypsum under low temperature of (5 ± 1) ℃, appearance and resistance of the specimen were observed regularly Meanwhile, the sample of the paste was analyzed by X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. The influence of the dosage of gypsum on the destruction of the cement-based material sulfated karstificate (TSA) and the failure mechanism were studied. The results show that when the content of plaster is more than 10%, the TSA sulphate damage occurs, while the plaster content of 7.0% and 3.5% Does it cause TSA-type sulfate damage associated with the amount of tricalcium aluminate used in cement-based materials?