Deformation Analysis of Reinforced Concrete using Neutron Imaging Technique
T. Koyama, K. Ueno, M. Sekine, Y. Matsumoto, T. Kai, T. Shinohara, H. Iikura, H. Suzuki, M. Kanematsu
download PDFWe suggest a novel method to observe internal deformation of concrete using a neutron transmission imaging technique. In order to visualize the internal deformation of concrete, cement paste markers containing Gd2O3 powder were dispersed two-dimensionally around the ferritic deformed rebar in reinforced concrete. Displacement of the neutron transmission image of the Gd marker was evaluated by a change in the position of the marker as a function of the travel distance of the vertical sample stage, and it was successfully evaluated to within approximately ±0.1 mm accuracy by analyzing selected markers with higher contrast and circularity. Furthermore, concrete deformation under pullout loading to the embedded rebar was evaluated in the same way and compressive deformation of concrete was successfully observed by analyzing the displacement of the markers. The results obtained in this study bring beneficial knowledge that the measurement accuracy of the marker displacement can be improved by choosing spherical-shaped markers and by increasing the contrast of markers.
Keywords
Neutron Imaging, Reinforced Concrete, Deformation Analysis, Image Analysis
Published online 4/20/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: T. Koyama, K. Ueno, M. Sekine, Y. Matsumoto, T. Kai, T. Shinohara, H. Iikura, H. Suzuki, M. Kanematsu, ‘Deformation Analysis of Reinforced Concrete using Neutron Imaging Technique’, Materials Research Proceedings, Vol. 4, pp 155-160, 2018
DOI: https://dx.doi.org/10.21741/9781945291678-24
The article was published as article 24 of the book
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
References
[1] H. Suzuki, K. Kusunoki, Y. Hatanaka, T. Mukai, A. Tasai, M. Kanematsu, K. Kabayama and S. Harjo, Measuring strain and stress distributions along rebar embedded in concrete using time-of-flight neutron diffraction, Measurement Science and Technology, 25 (2014) 025602. https://doi.org/10.1088/0957-0233/25/2/025602
[2] H. Suzuki, K. Kusunoki, M. Kanematsu, A. Tasai, Y. Hatanaka, N. Tsuchiya, S.C. Bae, S. Shiroishi, S. Sakurai, T. Kawasaki and S. Harjo, Application of neutron stress measurement to reinforced concrete structure, JPS Conference Proceedings, 8 (2015) 031006. https://doi.org/10.7566/JPSCP.8.031006
[3] H. Suzuki, K. Kusunoki, M. Kanematsu, T. Mukai and S. Harjo, Structural engineering studies on reinforced concrete structure using neutron diffraction, Materials Research Proceedings, 2 (2016) 25-30.
[4] K. Watanabe, H. Higashi, T. Miki and J. Niwa, Real Time Image Analyzing System for loading tests of structural concrete, Doboku Gakkai Ronbunshuu E, 66 (2010) 94-106 [in Japanese]. https://doi.org/10.2208/jsceje.66.94
[5] K. Yu, J. Yu, Z. Lu and Q. Chen, Fracture properties of high-strength/high-performance concrete (HSC/HPC) exposed to high temperature, Materials and Structures, 49 (2016) 4517-4532. https://doi.org/10.1617/s11527-016-0804-x
[6] T. Shinohara, T. Kai, K. Oikawa, M. Segawa, M. Harada, T. Nakatani, M. Ooi, K. Aizawa, H. Sato, T. Kamiyama, H. Yokota, T. Sera, K. Mochiki and Y. Kiyanagi, Final design of the Energy-Resolved Neutron Imaging System “RADEN” at J-PARC, Journal of Physics: Conference Series 746 (2016) 012007. https://doi.org/10.1088/1742-6596/746/1/012007
[7] C.A. Schneider, W.S. Rasband and K.W. Eliceiri, NIH Image to ImageJ: 25 years of image analysis, Nature methods 9 (2012) 671-675. https://doi.org/10.1038/nmeth.2089
