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首页> 外文期刊>Journal of thermal analysis and calorimetry >Composition and microstructural changes in an aged cement pastes upon two heating-cooling regimes, as studied by thermal analysis and X-ray diffraction
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Composition and microstructural changes in an aged cement pastes upon two heating-cooling regimes, as studied by thermal analysis and X-ray diffraction

机译：通过热分析和X射线衍射研究了两种加热-冷却方式下老化水泥浆的组成和微观结构变化

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摘要

This paper studies the microstructural changes in a 2-year-old cement paste heated up to various temperature up to 1000 degrees C in steps of 100 degrees C for a constant period of 6 h by TG/DTG and XRD. Two cooling regimes are applied: air-and desiccator-cooling regime. The impact of ageing on the microstructure of the heated specimens is analysed by comparison with a cement paste cured at 28 days. The result shows higher amounts of portlandite and carbonate calcium for the aged cement paste. The new portlandite formed during cooling continues to exist until the 1000 degrees C temperature plateau. The decomposition of the latter portlandite induces higher quantities of lime, and then higher mass loss in the case of the air-cooling regime compared to the desiccator one. Nevertheless, the XRD shows that the peak's intensity of lime is lower in the case of air-cooling regime. The CSH dehydration to beta-C2S and C3S becomes significant above 600 degrees C and the corresponding rate increases with increasing temperature. An increase in the total mass loss and in the crystallinity at 900 and 1000 degrees C, compared to 800 degrees C, is noted.
机译：本文通过TG / DTG和XRD研究了2年的水泥浆的微观结构变化，该浆在100℃的温度下连续6h加热到1000℃的各种温度。应用了两种冷却方式：空气冷却器和干燥器冷却方式。通过与在28天固化的水泥浆进行比较，分析了时效对加热试样的微观结构的影响。结果表明，老化水泥浆中的硅酸盐和碳酸钙含量更高。在冷却过程中形成的新的硅酸盐继续存在，直到温度达到1000摄氏度。与干燥剂相比，后一种硅酸盐的分解会诱发更多的石灰，然后在空气冷却方式下产生更高的质量损失。然而，X射线衍射表明，在空气冷却方式下，石灰的峰值强度较低。 CSH脱水成β-C2S和C3S的温度在600摄氏度以上变得明显，并且相应的速率随温度升高而增加。与800摄氏度相比，在900和1000摄氏度时，总质量损失和结晶度有所增加。

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