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Neutron diffraction studies on strain evaluation of rebar in reinforced concrete

Published online by Cambridge University Press:  06 March 2012

Hiroshi Suzuki ,
Manabu Kanematsu  and
Koichi Kusunoki
Hiroshi Suzuki
Affiliation:
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan
Manabu Kanematsu
Affiliation:
Department of Architecture, Tokyo University of Science, Noda, Chiba 278-8510, Japan
Koichi Kusunoki
Affiliation:
Department of Architecture, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
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Abstract

The neutron diffraction technique was applied to measure strain distributions in a rebar in a reinforced concrete. At first, absorption coefficients of several kinds of concrete with different compounding ratios of water, cement, and aggregate were measured, and it was confirmed that the absorption coefficient of concrete was affected by the amounts of water and aggregate. In addition, it was also clarified by measuring strain change of the rebar under tensile loading that accuracy of the strain measurement in the rebar in the reinforced concrete was not affected by the neutron absorption by the concrete. Second, the size of the anchorage zone was evaluated by measuring strain distributions in the rebar under pull-out loading. The length of the anchorage zone measured by neutron diffraction was shorter than that measured by strain gauges. Moreover, detailed strain distributions in the rebar around cracks in the concrete were measured under tensile loading, and it was confirmed that the bond condition between rebar and concrete around cracks could be evaluated using the neutron diffraction technique.

Keywords

neutron diffractionreinforced concreterebarstrainanchorage zone
Type
Applications Of Residual Stress Analysis
Information
Powder Diffraction , Volume 24 , Supplement S1 , June 2009 , pp. S68 - S71
Copyright
Copyright © Cambridge University Press 2009

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