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

Short, N.R. / Brough, A.R. / Seneviratne, A.M.G. / Purnell, P. / Page, C.L.

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 29.Si 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.

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

Short, N.R. / Brough, A.R. / Seneviratne, A.M.G. / Purnell, P. / Page, C.L.

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 29.Si 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.

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

Short, N.R. / Brough, A.R. / Seneviratne, A.M.G. / Purnell, P. / Page, C.L.

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 29.Si 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.

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Title:

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

Additional title:

Vorläufige Untersuchung der Phasenzusammensetzung und der Porenfeinstruktur von überkritisch carbonisierten Zementpasten

Contributors:

Short, N.R. (author) / Brough, A.R. (author) / Seneviratne, A.M.G. (author) / Purnell, P. (author) / Page, C.L. (author)

Published in:

Journal of Materials Science ; 39 ; 5683-5687

Publication date:

2004

Size:

5 Seiten, 3 Bilder, 5 Tabellen, 8 Quellen

ISSN:

DOI:

https://doi.org/10.1023/B:JMSC.0000040076.42260.cb

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

überkritischer Druck , Matrix , Calciumhydroxid , Gel , Porosität , magnetische Kernresonanz , Thermogravimetrie , Feuchtegehalt , Calciumcarbonat , Silicagel , Trocknen , Calciumsilicathydrat , Zementpaste

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