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Implications for C 3 S kinetics from combined C 3 S/ CA hydration
Author(s) -
Nehring Jörg,
Naber Christoph,
Neubauer Jürgen,
GoetzNeunhoeffer Friedlinde
Publication year - 2018
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.15537
Subject(s) - dissolution , kinetics , hydrate , chemistry , phase (matter) , calorimetry , monoclinic crystal system , diffusion , analytical chemistry (journal) , calcium silicate hydrate , mineralogy , thermodynamics , crystallography , materials science , chromatography , cement , crystal structure , organic chemistry , metallurgy , quantum mechanics , physics
This study was performed to understand the influence of a critical amount of CA on the kinetics of C 3 S hydration. For this purpose, monoclinic C 3 S was blended with 15 wt.% CA and investigated by heat flow calorimetry and in situ XRD at 23°C at a water to cement ratio of 0.5. The binary mixture shows 3 distinct heat flow maxima where the underlying C 3 S dissolution is proceeding stepwise. The C 3 S dissolution rates during the 3 steps are varying strongly, depending on the hydrate phase precipitated during the respective reaction step. Comparison of these dissolution rates with a pure C 3 S reference sample allows the conclusion that the dissolution rate of pure C 3 S after the heat flow maximum might be governed by either the remaining available reactive surface of C 3 S or a diffusion‐controlled process, which would both be influenced by the respective hydrate phase precipitating on the C 3 S surface.