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MODIFICATIONS IN C-S-H COMPOSITION OF CEMENT PASTES WITH SILICA ADDITIONS UNDER DIFFERENT MIXING CONDITIONS
Pages : [1] - [23]
Received : February 24, 2016; Revised March 16, 2016
Communicated by : Professor Laura Floroian
Abstract
The modification of the C-S-H gel composition depending on the mixing conditions in two sets of cement paste additivated samples (manual mixed or previously deposited AW and AC) is studied, from 
FTIR, MIP, EDS, and SEM experiments. In the AW samples no isomorphical 
substitution in the silicate chains takes place, whereas for the AC samples 
signals prompted to the existence of aluminosilicate chains, in which .gif){kind=small}
cations are located in bridging positions of silicate chains. The variations found in the NMR spectra connected to microstructural features and MIP data.
Keywords
cement paste, silica fume, SEM, spectroscopy, calcium-silicate-hydrate (C-S-H).