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Impact of Annealing on the Early Hydration of Tricalcium Silicate
Author(s) -
Bazzoni Amélie,
Cantoni Marco,
Scrivener Karen L.
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12691
Subject(s) - annealing (glass) , microstructure , materials science , transmission electron microscopy , silicate , calorimetry , scanning electron microscope , differential scanning calorimetry , isothermal process , chemical engineering , mineralogy , crystallography , chemistry , composite material , nanotechnology , thermodynamics , physics , engineering
It was recently proposed that the induction period observed during the hydration of tricalcium silicate could be explained by the build‐up of ions in solution. Due to the importance of defects in this mechanism, this work describes the effect of different annealing effects on the defect structure and hydration behavior of C 3 S . The impact of annealing on the crystal structure was checked by X ‐ray diffraction and the defect structure studied by transmission electron microscopy. The hydration kinetics were followed by isothermal calorimetry of pastes. Scanning electron microscopy was used to look at the microstructure formation. It was observed that grinding created a highly deformed layer on the surface of the grains, which disappeared after annealing. The defect structure was closely related to the length of the induction period observed in pastes by calorimetry. There was no observable effect on the morphology of C–S–H during hydration, but the number of calcium hydroxide nuclei was less in pastes from annealed material.