Thermodynamic modeling of hydrated white Portland cement–metakaolin–limestone blends utilizing hydration kinetics from 29Si MAS NMR spectroscopy
By W. Kunther, Zhuo Dai, J. Skibsted. 2016
152 citations recorded by the source corpus.
Abstract Hydration kinetics for the principal phases of Portland cement blends have been incorporated in thermodynamic modeling (GEMS package), utilizing degrees of hydration from 29 Si MAS NMR. An empirical relationship for the reaction of these phases is established which includes three variable parameters that all can be estimated from the degrees of hydration. This approach is compared with thermodynamic equilibrium modeling (full hydration) for white Portland cement–metakaolin (0–30 wt.%) blends and for ternary blends of white Portland cement (65 wt.%)–metakaolin–limestone. The predicted phase assemblages have been compared with the phases identified by XRD, 27 Al and 29 Si MAS NMR which reveals that the incorporation of hydration kinetics improves the agreement between modeling and experiments. The results show also that the formation of stratlingite depends critically on the quantity of charge-balancing anions in the AFm phases, especially carbonate and sulfate anions, and on the degree of hydration for metakaolin.
Subfields: Civil and Structural Engineering, Industrial and Manufacturing Engineering
View Paper: https://www.semanticscholar.org/paper/46a0d317c3e6f0201e9898cb948d744f2a8d8c3b
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In Civil and Structural Engineering
- M. Zając
- L. Black
- Christopher B. Stabler
- S. Adu-Amankwah
- B. Lothenbach
- F. Winnefeld
- J. Provis
- Mohsen Ben Haha
In Industrial and Manufacturing Engineering
Citations in the corpus
- Influence of limestone on the hydration of ternary slag cements (2017, background): “In many other studies, neat Portland cement has 565 been replaced by the supplementary cementitious materials without maintaining a 566 fixed SO3 content [51, 52] 567 Aluminium uptake by C–S–H depends strongly on the aluminium concentrations in the 568 pore solution [53].”