The carbonation of cement paste changes its microstructural characteristics. The porosity of the cement paste microstructure is reduced when calcite is produced from the reaction between portlandite and carbon dioxide. In this study, such microstructural changes were investigated using image analyses of the 3D microstructures obtained with synchrotron micro-computed tomography (CT). When two sets of samples were subjected to different degrees of carbonation, the porosity and pore size reductions were identified from the micro-CT images. The formation of calcite caused by the reaction of portlandite was indirectly identified by the reduction of the mean grayscale value or linear attenuation coefficient (LAC) of the solid phase voxels. It was confirmed that micro-CT could also be used as a supplementary tool for the analysis of the microstructural evolution of cement paste under carbonation.
Bibliographical noteFunding Information:
This research was supported by grants from the Korea Research Foundation, funded by the Korean Government (NRF-2019R1A2C2086314 and NRF-2020K2A9A2A08000134). This work was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20174030201480). The micro-CT images were obtained using the synchrotron operated by the Pohang Accelerator Laboratory (PAL) in Korea.
© 2020 Elsevier Ltd
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Building and Construction
- Materials Science(all)