Monitoring the Evolution of Accelerated Carbonation of Hardened Cement Pastes by X-Ray Computed Tomography
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 3
Abstract
The evolution of carbonation front progress, crack spatial distribution, and pore structure parameters of hardened cement paste have been monitored in situ by three-dimensional (3D) X-ray computed tomography (XCT) at different accelerated carbonation ages of 0, 3, 7, 14, and 28 days, respectively. The gray-value histograms of cement paste are a function of carbonation time, and the carbonation degrees at different times can be estimated by the volume fractions of uncarbonated and carbonated parts. Many cracks generate along the carbonation direction because of carbonation shrinkage. With the extension of the carbonation time, the volume and surface of cracks become larger. The porosity markedly decreases when pore volume is between 0.01 and as the carbonation time increases.
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Acknowledgments
This work is supported by a grant from the Major State Basic Research Development Program of the People’s Republic of China (The 973 Project) (No. 2009CB623200 and No. 2011CB013800) and the Scientific Research Foundation of the Graduate School of Southeast University (No. YBJJ1113) and the national natural science foundation of China (No. 51178103). The experiments were carried out at the School of Materials Science and Engineering of Southeast University and the Jiangsu Key Lab of Construction Material in Nanjing city, P.R. China.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 3 • March 2013
Pages: 347 - 354
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 10, 2011
Accepted: Jun 7, 2012
Published online: Aug 25, 2012
Published in print: Mar 1, 2013
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