Preliminary investigations of the phase composition and fine pore structure of super-critically carbonated cement pastes

Super-critical carbonation of cement-based materials can lead to significant improvements in their properties. Preliminary investigations suggested that processing should be aimed at producing a matrix material with minimal amounts of Ca(OH)2, anhydrous material and C—S—H gel along with a controlled...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 2004-09, Vol.39 (18), p.5683-5687
Main Authors: SHORT, N. R, BROUGH, A. R, SENEVIRATNE, A. M. G, PURNELL, P, PAGE, C. L
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Calcium carbonate
Carbonation
Cement concrete constituents
Cement paste
Cements
Exact sciences and technology
Materials
Materials science
Moisture content
NMR spectroscopy
Phase composition
Porosity
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Silica gel
Silicon dioxide
Slaked lime
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Super-critical carbonation of cement-based materials can lead to significant improvements in their properties. Preliminary investigations suggested that processing should be aimed at producing a matrix material with minimal amounts of Ca(OH)2, anhydrous material and C—S—H gel along with a controlled pore structure. Using 29Si MAS NMR and TGA as the principal investigative techniques it has been shown that moisture content during carbonation is a major factor in determining the phase composition and pore structure of the resulting matrix. Of the drying regimes studied, 60% DOD gave the greatest amount of conversion to calcium carbonate and silica gel.
ISSN:0022-2461
1573-4803
DOI:10.1023/B:JMSC.0000040076.42260.cb