Study of carbonation rate of synthesized C-S-H by NMR and FTIR

Conference paper (2018)

Authors

B. Wu Materials and Environment - CEG
G. Ye Materials and Environment - CEG , Universiteit Gent
Yunpeng Liu Wuhan University of Technology
Wenqin Zhang Wuhan University of Technology
Research Group
Materials and Environment (CEG) (TU Delft)
C-S-H Ca/Si ratio Carbonation rate
More Info
expand_more

Published Date

2018

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

C-S-H with different Ca/Si ratios, formed from the hydration and pozzolanic reactions of blended cement paste, are the major calcium-bearing phases which react with CO2 during the carbonation. Therefore, it’s important to study the carbonation rate of different C-S-H phases. In this paper, the C-S-H phases (Ca/Si ratio: 0.66 to 2.0) were synthesized and used for the accelerated carbonation test with the CO2 concentration of 3%±0.2. Synthesized C-S-H phases with different Ca/Si ratio were identified by 29Si nuclear magnetic resonance (NMR). Carbonation rate and products of different C-S-H phases were studied by NMR and Fouriertransform infrared spectroscopy (FTIR). The results show that C-S-H phases with different Ca/Si ratio (lower than 1.40) was synthesized. C-S-H with lower Ca/Si ratio is decomposed faster than that with a higher Ca/Si ratio. After three days’ accelerated carbonation, the C-S-H phases with different Ca/Si ratio were all fully decomposed to CaCO3 and silica gel.