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Effect of phase change composites on hydration characteristics of steam-cured cement paste

Effect of phase change composites on hydration characteristics of steam-cured cement paste

Authors :
Cong Ma
Liping Bi
Wu Jianxian
Guangcheng Long
Youjun Xie
Source :
Construction and Building Materials. 274:122030
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

The application of phase change materials (PCMs) in building materials has attracted more and more attention. However, there is little information on the interactions between PCMs and cementitious material during hydration process. This study investigates the influence of PCMs on cement hydration behavior under steam curing condition. Three kinds of composite phase change material (CPCM) are synthesized, denoted by D/P, EG/P and D/EG/P, respectively. The thermal stability and crystalline phase of PCMs are characterized. The effects of above PCMs on hydration process of cement are evaluated by several testing methods, including isothermal calorimetry, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy. Results indicate that CPCMs exhibit good thermal stability compared with single paraffin when the operating range is less than 200 °C. The time to reach the heat release rate peak of binders containing paraffin, D/P, EG/P and D/EG/P is 20 min, 20 min, 20 min and 30 min earlier than the cement pastes without PCM at 60 °C isothermal condition, respectively. The addition of a small amount of CPCM can accelerate the early hydration of steam-cured cement paste due to the combined action of paraffin and carriers with high surface area that can provide nucleation sites. Moreover, the combination of two carriers promotes cement hydration better than the single carrier. However, the number of hydration products and phase compositions of steam-cured cement paste are almost not affected by the addition of CPCM.

Details

ISSN :
09500618
Volume :
274
Database :
OpenAIRE
Journal :
Construction and Building Materials
Accession number :
edsair.doi...........be05bd248d090f6d60c1e56b37c05c51
Full Text :
https://doi.org/10.1016/j.conbuildmat.2020.122030