Retardation effect of elevated temperature on the setting of calcium sulfoaluminate cement clinker

Retardation effect of elevated temperature on the setting of calcium sulfoaluminate cement clinker
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高温对硫铝酸钙水泥熟料凝结的延迟作用

DOI:
10.1016/j.conbuildmat.2018.05.061
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发表时间:
2018-07
影响因子:
7.4
通讯作者:
Wang Peiming
Wang Peiming
中科院分区:
工程技术1区
文献类型:
--
作者:
Xu Linglin;Liu Siyu;Li Nan;Peng Yu;Wu Kai;Wang Peiming

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采用X-射线衍射仪、差热-热重仪和扫描电子显微镜相结合的方法对硫铝酸钙熟料在5、20和40 °C下的水化过程进行了表征。同时,对凝结时间和抗压强度的发展进行了研究。值得注意的是,升温显著延缓了CSA熟料的凝结,降低了熟料的抗压强度,但却促进了CSA熟料的水化放热和水化程度。随着温度从5 °C升高到40 °C,1d后形成的钙矾石数量减少一半,而氧化铝凝胶的数量增加了4倍以上,并伴随着更不均匀的微观结构和更高的孔隙率。ESEM观察表明,这种块状氧化铝凝胶覆盖在未反应颗粒和其他水合物上,这可能是温度升高对CSA熟料凝结的延缓作用。
The hydration of calcium sulfoaluminate (CSA) clinker at 5, 20 and 40 °C was characterized by a combination of XRD, DTA-TG and ESEM analysis (also with backscattered electron imaging, BEI). Meanwhile, the setting times and compressive strength development were studied. It was interesting to notice that elevated temperature retards the setting of CSA clinker and decreases compressive strength prominently, while it promotes the hydration heat releasement and hydration degree. With the temperature rising from 5 °C to 40 °C, the amount of ettringite formed after 1 d decreases by half, but alumina gel increases by more than 4 times, accompanying with a more inhomogeneous microstructure and higher porosity. ESEM observations indicate that such massive alumina gel covers on the unreacted particles and other hydrates, which could account for the retardation of elevated temperature on the setting of CSA clinker.
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