Journal of Advanced Concrete Technology
Online ISSN : 1347-3913
ISSN-L : 1346-8014
Scientific paper
Carbonation Reaction of Calcium Silicate Hydrates by Hydrothermal Synthesis at 150°C in OPC-γ-Ca2SiO4-α-Quartz Systems
Tsuyoshi SaitoEtsuo SakaiMinoru MoriokaMasaki Daimon
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2007 Volume 5 Issue 3 Pages 333-341

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Abstract

In order to develop organic-fiber reinforced building materials with long-term stability and durability, the carbonation of autoclaved calcium silicate hydrate hardening bodies, prepared by low-temperature synthesis (150°C) in Ordinary Portland Cement (OPC)-γ-Ca2SiO4 (γ-C2S)-α-quartz systems, has been investigated. The CO2 absorption decreased remarkably as the water-to-powder ratio (w/p) of the samples decreased, and the carbonation of the samples was inhibited. In addition, this tendency became remarkable by the use of γ-C2S, and carbonation was fully inhibited in the case where the mass ratio of the starting materials OPC, γ-C2S and α-quartz was 1:4:5. It is estimated that only vaterite, which was based on residual γ-C2S after accelerated carbonation and had a lower density than calcite and aragonite, filled the pores and densified the sample.

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© 2007 by Japan Concrete Institute
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