期刊
MATERIALS CHARACTERIZATION
卷 145, 期 -, 页码 277-283出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.08.047
关键词
X-ray microtomography; Porous material; 3D pore structure; Quantitative characterization; Cement
类别
资金
- National Natural Science Foundation of China [51678143, 51878153]
- 973 Program [2015CB655102]
- National Key R&D Program of China [2017YFB0309904]
In this paper, a centrifuge device is proposed to facilitate the intrusion of a low-melting point metal alloy into the pore space of hardened cement paste. X-ray microtomography is combined with metal centrifugation porosimetry (MCP) to quantitatively investigate 3D pore structure. The low-melting-point metal alloy is melted and introduced into pore space in pastes with water cement ratio of 0.5 and 1.0 at a temperature of 65 degrees C. 3D pore structure is quantitatively analyzed by X-ray microtomography after the molten metal alloy has been consolidated. A new threshold value segmentation method for pore space was proposed using conversion coefficient on region of interest (ROI). Porosity and pore size distribution are tested by MCP and compared with the results based on mercury intrusion porosimetry (MIP). The results show that the contrast between pore space and solid phase in the X-ray microtomography device image is improved. The total porosity obtained by MCP was found to be consistent with the results obtained by MIP.
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