Simulation of silica fume blended cement hydration

A model is proposed in this paper to simulate silica fume (SF) blended cement hydration based on the kinetics, stoichiometry and physical chemistry of cement hydration and pozzolanic reaction. The pozzolanic reaction degree, volume fraction of hydration products, capillary porosity and gel porosity...

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Bibliographic Details
Published in:Materials and structures 2004-07, Vol.37 (6), p.397-404
Main Authors: Yajun, J, Cahyadi, J H
Format: Article
Language:English
Subjects:
Blended
Building construction
Building materials
Capillarity
Cement hydration
Cements
Civil engineering
Computer simulation
Hydration
Porosity
Silica fume
Simulation
Studies
Volume fraction
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Summary:A model is proposed in this paper to simulate silica fume (SF) blended cement hydration based on the kinetics, stoichiometry and physical chemistry of cement hydration and pozzolanic reaction. The pozzolanic reaction degree, volume fraction of hydration products, capillary porosity and gel porosity can be obtained from model simulation. By using proper amount of silica fume replacement, the microstructure of silica fume blended cement paste is improved since the volume fraction of C-S-H gel is increased, Ca(OH)^sub 2^ content and capillary porosity are decreased due to pozzolanic reaction compared with ordinary Portland cement (OPC) paste. The effects of silica fume particle size, glass phase content and the percentage of silica fume replacement on pozzolanic reaction degree, volume fraction of hydration products, and capillary porosity are simulated. The simulation results show that finer silica fume particles with higher glass phase content (GP) are of higher reactivity. There is an optimum silica fume replacement; extra silica fume only acts as inert filler because there is no enough Ca(OH)^sub 2^ from cement hydration to react with it pozzolanically.[PUBLICATION ABSTRACT]
ISSN:1359-5997
1871-6873
DOI:10.1007/BF02479636