【摘要】 当水泥混凝土材料进行服役时往往会受到MgSO₄的侵蚀,在该过程中常伴随着各种物理与化学变化。通过研究浸泡MgSO₄溶液中达到两年的水泥砂浆试块中钙钒石等物质变化,并通过合成钙钒石研究这一趋势的变化规律。结果表明,在水泥砂浆试块中存在由钙矾石向石膏转化的趋势。通过合成钙矾石的热重-差热分析研究该过程中的变化,实验结果表明在碱性环境下的钙矾石在硫酸镁的存在下会分解成石膏等产物。通过对差示扫描量热仪数据进行微分处理研究其中Mg（OH）₂的变化,并发现在碱性环境下随着外界硫酸镁溶液的增加Mg（OH）₂的含量也逐渐增加。更多还原

【Abstract】 Cement concrete materials are often faced the magnesium sulfate attack which accompanied by a variety of physical and chemical changes in the process of its service. The material changes of cement mortar samples immersed in magnesium sulfate solution for two years were studied. In order to confirm the result,TG-DSC analysis of synthetic ettringite was carried out. The results show that in the presence of MgSO₄ solution,ettringite is decomposed into gypsum and other products in alkaline environment. In this process,the change of Mg（OH）₂ is studied by differential processing of DSC data. It is found that the content of Mg（OH）₂ is increase with the concentration of MgSO₄ environment.更多还原