水泥石热膨胀性能的研究

對水泥石從室溫(20℃)升到600℃和經室溫到180℃熱循環后再從室溫升至600℃的熱膨脹率進行了研究,結果表明,2種條件下水泥石熱膨脹率的變化均表現為隨溫度的升高先提高而后再降低的趨勢,而熱膨脹率達最大值時前者溫度較后者低70℃左右,即熱循環可以提高水泥石在受熱時出現收縮的溫度值.借助于DSC/TG和XRD測試手段,對水泥石的熱膨脹性能變化規律進行了機理分析. In this paper, thermal expansion properties of hydraulic cement paste are studied. Two kinds of heat systems are included in the research: one is heating from 20°C to 600°C directly, another is heating from 20°C to 600°C after several thermal cycles which range from 20°C to 180°C. The results show that thermal expansion curve increases at the initial stage and then decreases with the temperature increasing in the both two heat systems. But the temperature of the former heat system at which the thermal expansion ratio reaches maximum is 70°C lower than that of the latter. That means that the thermal cycle decreases the temperature to reach the maximum thermal expansion. The mechanism of thermal expansion of hydraulic cement paste is also researched with DSC/TG and XRD methods.