The Carbonation of Cement-Based Materials with Different Aggregate Content

The aggregate occupies most of the volume of the concrete; it significantly affects the diffusion of CO2 in the concrete. In this study, we adopted the accelerated carbonation test to investigate the effect of the aggregate content and paste thickness on the carbonation resistance of cement-based ma...

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Bibliographic Details
Published inMaterials science forum Vol. 902; pp. 74 - 78
Main Authors Pan, Gang Hua, Shen, Qi Zhen
Format Journal Article
LanguageEnglish
Published Pfaffikon Trans Tech Publications Ltd 17.07.2017
Subjects
Accelerated tests
Carbonation
Concrete
Dilution
Mortars (material)
Percolation
Thickness
Tortuosity
Aggregate Content
Paste Thickness
Carbonation
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Summary:The aggregate occupies most of the volume of the concrete; it significantly affects the diffusion of CO2 in the concrete. In this study, we adopted the accelerated carbonation test to investigate the effect of the aggregate content and paste thickness on the carbonation resistance of cement-based materials. Results showed that for the mortar specimens, 44% was the critical percolation sand volume. Within the critical volume, the dilution and tortuosity effects were in the dominant position; while over the critical volume, the interfacial transition zone (ITZ) and percolation effects were in the dominant position. For the concrete specimens, the paste thickness had good correlation with the concrete carbonation depth: the paste thickness increased and the carbonation depth showed a decrease tend; otherwise, the paste thickness decrease and the carbonation depth showed an increase tend.
Bibliography:Selected, peer reviewed papers from the 2016 International Conference on Civil and Building Materials, October 15-17, 2016, Hong Kong
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.902.74