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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
- 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.
- Subjects :
- Cement
Thermogravimetric analysis
Materials science
Scanning electron microscope
0211 other engineering and technologies
Nucleation
020101 civil engineering
02 engineering and technology
Building and Construction
Isothermal process
0201 civil engineering
021105 building & construction
General Materials Science
Thermal stability
Cementitious
Composite material
Curing (chemistry)
Civil and Structural Engineering
Subjects
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