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- Title
微裂缝钢混构件水分侵入的成像与定量表征.
- Authors
张鹏; 李绍纯; 赵铁军; 王鹏刚; 杨进波
- Abstract
Micro-cracks with average widths ranging from 20 μm to 88 μm were induced by three points bending on two types of reinforced concrete C30 and C50. The process of water penetration into these micro¬cracked concrete were studied experimentally by means of neutron radiography. The spatial water distributions in cracked concrete during water penetration were calculated quantitatively. The results indicate that cracks provide preferential paths for water penetration into cracked concrete even though the crack width is only 20 μm. Water penetrated into the fine cracks once contacted the cracked concrete, it will be immediately followed by migrating into the adjacent region from two sides of the cracks horizontally and into the region behind the cracks end vertically. When crack width is up to 82 &m, which corresponds to the ratio of 0.39% between crack width and cover thickness, there is also water ingress existing in the interfaces between steel reinforcement and cement matrix. But the water content in this area is very low. The water profiles have peaks at the positions of cracks, where the profiles start decreasing from both sides of cracks symmetrically.
- Publication
Jianzhu Cailiao Xuebao: Journal of Building Materials, 2015, Vol 18, Issue 3, p438
- ISSN
1007-9629
- Publication type
Article
- DOI
10.3969/j.issn.1007-9629.2015.03.014