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Effect of water-to-binder ratio on the hydration kinetics of composite binder containing slag or fly ash
- Source :
- Journal of Thermal Analysis and Calorimetry. 128:855-865
- Publication Year :
- 2016
- Publisher :
- Springer Science and Business Media LLC, 2016.
-
Abstract
- The calorimetric data of composite binder containing slag or fly ash at different water-to-binder ratios were measured at 298 and 333 K by an isothermal calorimeter. The influences of water-to-binder ratio on the hydration heat characteristics of composite binder were analyzed. Based on the hydration kinetics model, the controlling processes during hydration, nucleation and crystal growth (NG), interactions at phase boundaries (I) and diffusion (D), were determined, and the kinetics parameters were calculated and discussed. The results show that water-to-binder ratio slightly affects the early-stage hydration heat evolution rate and cumulative hydration heat, but a lower water-to-binder ratio results in a lower hydration heat evolution rate and cumulative hydration heat at later stage. The water-to-binder ratio has a great effect on the hydration of composite binder at elevated temperature. Decreasing water-to-binder ratio does not change the hydration mechanism of composite binder, which is NG → I → D at 298 K and becomes NG → D at 333 K. The decrease in water-to-binder ratio increases the apparent rate constant of composite binder containing slag, but the inverse trend is obtained for composite binder containing fly ash during NG process at 298 K. The lower water-to-binder ratio leads to the lower apparent rate constant for composite binder containing large amount of slag or fly ash during NG process at 333 K. Decreasing water-to-binder ratio decreases the apparent rate constant during D process for all samples. The apparent activation energy of composite binder decreases with decreasing water-to-binder ratio.
- Subjects :
- Materials science
Diffusion
Composite number
0211 other engineering and technologies
Nucleation
Slag
02 engineering and technology
Activation energy
Condensed Matter Physics
01 natural sciences
Isothermal process
010406 physical chemistry
0104 chemical sciences
Reaction rate constant
Fly ash
visual_art
021105 building & construction
visual_art.visual_art_medium
Physical and Theoretical Chemistry
Composite material
Subjects
Details
- ISSN :
- 15882926 and 13886150
- Volume :
- 128
- Database :
- OpenAIRE
- Journal :
- Journal of Thermal Analysis and Calorimetry
- Accession number :
- edsair.doi...........01c5dd16ae2ed281e385b3cd6f1ff8fb