期刊
MATERIALS CHARACTERIZATION
卷 73, 期 -, 页码 137-143出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2012.08.008
关键词
Cement; Paste-void spacing; Air voids; X-ray CT
类别
资金
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2011-0022883, 2011-0005593]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Korean Government Ministry of Knowledge Economy [2010T100200494]
- National Research Foundation of Korea [2011-0022883] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The distribution of paste-void spacing in cement-based materials is an important feature related to the freeze-thaw durability of these materials, but its reliable estimation remains an unresolved problem. Herein, we evaluate the capability of X-ray computed tomography (CT) for reliable quantification of the distribution of paste-void spacing. Using X-ray CT images of three mortar specimens having different air-entrainment characteristics, we calculate the distributions of paste-void spacing of the specimens by applying previously suggested methods for deriving the exact spacing of air-void systems. This methodology is assessed by comparing the 95th percentile of the cumulative distribution function of the paste-void spacing with spacing factors computed by applying the linear-traverse method to 3D air-void system and reconstructing equivalent air-void distribution in 3D. Results show that the distributions of equivalent void diameter and paste-void spacing follow lognormal and normal distributions, respectively, and the ratios between the 95th percentile paste-void spacing value and the spacing factors reside within the ranges reported by previous numerical studies. This experimental finding indicates that the distribution of paste-void spacing quantified using X-ray CT has the potential to be the basis for a statistical assessment of the freeze-thaw durability of cement-based materials. (C) 2012 Elsevier Inc. All rights reserved.
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