Imperial College London
Portrait Picture

Professor Hong S. Wong

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Concrete Materials
 
 
 
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Contact

 

+44 (0)20 7594 5956hong.wong Website

 
 
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Assistant

 

Ms Ruth Bello +44 (0)20 7594 6040

 
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Location

 

228DSkempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2022:10.1111/jmi.13084,
author = {Zhang, K and Yio, M and Wong, H and Buenfeld, N},
doi = {10.1111/jmi.13084},
journal = {Journal of Microscopy},
pages = {126--133},
title = {Real-time monitoring of carbonation of hardened cement pastes using Raman microscopy},
url = {http://dx.doi.org/10.1111/jmi.13084},
volume = {286},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This study investigated the feasibility of Raman microscopy for monitoring early surface carbonation of hardened cement pastes in real time for up to 7 days. Samples were exposed to natural carbonation (440 ppm CO2) and accelerated carbonation (4% CO2), and the evolution of calcium carbonate (CaCO3) polymorphs, portlandite, ettringite, C-S-H gel and unreacted cement particles was followed. Results showed that calcite is the main polymorph formed under both natural and accelerated carbonation. Under accelerated carbonation, the formation of calcite on the sample surface completed within 1 day whereas under natural carbonation, the formation of calcite is expected to continue beyond 7 days. The contents of portlandite and ettringite decreased rapidly under accelerated carbonation but much more gradually under natural carbonation. However, calcium silicate minerals in unreacted cement particles remained unchanged throughout the carbonation processes. Overall, this study demonstrated that Raman microscopy is a valuable tool for non-destructive real-time imaging of surface carbonation in cement-based materials.
AU  - Zhang,K
AU  - Yio,M
AU  - Wong,H
AU  - Buenfeld,N
DO  - 10.1111/jmi.13084
EP  - 133
PY  - 2022///
SN  - 0022-2720
SP  - 126
TI  - Real-time monitoring of carbonation of hardened cement pastes using Raman microscopy
T2  - Journal of Microscopy
UR  - http://dx.doi.org/10.1111/jmi.13084
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000749609800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://onlinelibrary.wiley.com/doi/10.1111/jmi.13084
UR  - http://hdl.handle.net/10044/1/94616
VL  - 286
ER  -
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