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Journal Articles

Novel bond stress evaluation technique using neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Mukai, Tomohisa*

Konkurito Kozobutsu No Hihakai Kensa Shimpojiumu Hobunshu, 6, p.343 - 348, 2018/08

no abstracts in English

Journal Articles

Non-destructive bond stress evaluation of bending and shear deformed reinforced concrete structure using neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Satake, Kosuke*; Kanematsu, Manabu*; Koyama, Taku*; Niwa, Akinobu*; Kabayama, Kenji*; Mukai, Tomohisa*; Kawasaki, Takuro; Harjo, S.

Hihakai Kensa, 67(4), p.180 - 186, 2018/04

The bond behavior between rebar and concrete under bending moment was investigated by measuring the stress distribution in the two-dimensionally distributed rebars embedded in the reinforced concrete (RC) beam using neutron diffraction. The stress distributions in both of the main rebar and the transverse stirrups embedded in concrete were successfully measured at the fixed measurement configuration without any sample rotations, by suggesting a simple measurement technique on the premise that the transverse restriction from the surrounding concrete to the main rebar is negligible. The bending and shear fracture behavior of the RC beam specimen was predicted by comparing changes in the stress distribution in the rebars measured by neutron diffraction with respect to the applied stress, with the macroscopic deformation measured by strain gauges fixed on the concrete surface. In this study, it was found that the neutron diffraction technique can be a useful technique to evaluate not only the anchorage performance but also the bending behavior of the RC beam.

Journal Articles

Nondestructive measurement of bond stress distribution of reinforced concrete using neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Mukai, Tomohisa*

Konkurito Kozobutsu No Hoshu, Hokyo, Appuguredo Rombun Hokokushu, 17, p.179 - 184, 2017/10

no abstracts in English

Journal Articles

Structural engineering studies on reinforced concrete structure using neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Mukai, Tomohisa*; Harjo, S.

Materials Research Proceedings, Vol.2, p.25 - 30, 2017/00

 Times Cited Count:1 Percentile:46.32

It has been demonstrated in our past studies that neutron diffraction can be an alternative method to conventional strain gauge for measuring the stress distribution along rebar embedded in concrete. The current study investigated the possibility of the bond stress evaluation using neutron diffraction in order to find further capability of neutron diffraction for the structural engineering study on the reinforced concrete structure. Several peaks appeared in the bond stress distribution measured by neutron diffraction, showing the inhomogeneous bond variation along the embedded rebar. This result suggests that the neutron diffraction technique with high spacial resolution makes it possible to catch local bond resistance caused by the transverse ribs. The bond stress distribution measured by the neutron diffraction technique is expected to bring detailed understanding of the bond mechanism between rebar and concrete for the reinforced concrete structure.

Journal Articles

Application of neutron stress measurement to reinforced concrete structure

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Tasai, Akira*; Hatanaka, Yuichi*; Tsuchiya, Naoko*; Bae, S.*; Shiroishi, Sho*; Sakurai, Sonoko*; Kawasaki, Takuro; et al.

JPS Conference Proceedings (Internet), 8, p.031006_1 - 031006_6, 2015/09

The bond resistance between reinforcing bar (rebar) and concrete is one important parameter for examining integrity of the reinforced concrete structure, and is commonly evaluated by measuring the strain distribution along the rebar embedded in concrete. Here we present two types of applications of the time-of-flight neutron diffraction technique to measure the stress distribution of the rebar. It was demonstrated that bond deterioration around cracks developed in concrete can be evaluated by measuring the stress distribution along the embedded rebar using neutron diffraction. Furthermore, a change in the stress distribution along the rebar due to bond deterioration by corrosion was observed. The neutron diffraction technique is expected to become a novel method for measuring the stress (strain) of the rebar embedded in concrete, and will eventually provide insight into the actual phenomena on the reinforced concrete structures.

Journal Articles

Measuring strain and stress distributions along rebar embedded in concrete using time-of-flight neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Hatanaka, Yuichi*; Mukai, Tomohisa*; Tasai, Akira*; Kanematsu, Manabu*; Kabayama, Kenji*; Harjo, S.

Measurement Science and Technology, 25(2), p.025602_1 - 025602_8, 2014/02

 Times Cited Count:5 Percentile:46.45(Engineering, Multidisciplinary)

In the modern society, architectural and civil engineering structures such as reinforced concrete buildings require high seismic performance to minimize the "megarisk" exposed from urban earthquake hazards. In the reinforced concrete structures, the bond resistance between rebar and concrete is one important parameter for discussing its performance and it has been typically evaluated by measuring the strain distribution along the embedded rebar. Here we present an in-situ strain and stress measurements for the rebar in the reinforced concrete using time-of-flight neutron diffraction as a novel alternative technique to typical strain gauges. It was demonstrated in this study that the three-dimensional deformation behavior of the embedded rebar in normal-strength concrete, cured in air, can be accurately measured under pull-out loading using time-of-flight neutron diffraction.

JAEA Reports

Conceptual design of multipurpose compact research reactor; Annual report FY2011

Watahiki, Shunsuke; Hanakawa, Hiroki; Imaizumi, Tomomi; Nagata, Hiroshi; Ide, Hiroshi; Komukai, Bunsaku; Kimura, Nobuaki; Miyauchi, Masaru; Ito, Masayasu; Nishikata, Kaori; et al.

JAEA-Technology 2013-021, 43 Pages, 2013/07

JAEA-Technology-2013-021.pdf:5.12MB

The number of research reactors in the world is decreasing because of their aging. On the other hand, the necessity of research reactor, which is used for human resources development, progress of the science and technology, industrial use and safety research is increasing for the countries which are planning to introduce the nuclear power plants. From above background, the Neutron Irradiation and Testing Reactor Center began to discuss a basic concept of Multipurpose Compact Research Reactor (MCRR) for education and training, etc., on 2010 to 2012. This activity is also expected to contribute to design tool improvement and human resource development in the center. In 2011, design study of reactor core, irradiation facilities with high versatility and practicality, and hot laboratory equipment for the production of Mo-99 was carried out. As the result of design study of reactor core, subcriticality and operation time of the reactor in consideration of an irradiation capsule, and about the transient response of the reactor to the reactivity disturbance during automatic control operation, it was possible to do automatic operation of MCRR, was confirmed. As the result of design study of irradiation facilities, it was confirmed that the implementation of an efficient mass production radioisotope Mo-99 can be expected. As the result of design study with hot laboratory facilities, Mo-99 production, RI export devised considered cell and facilities for exporting the specimens quickly was designed.

JAEA Reports

Conceptual design of multipurpose compact research reactor; Annual report FY2010 (Joint research)

Imaizumi, Tomomi; Miyauchi, Masaru; Ito, Masayasu; Watahiki, Shunsuke; Nagata, Hiroshi; Hanakawa, Hiroki; Naka, Michihiro; Kawamata, Kazuo; Yamaura, Takayuki; Ide, Hiroshi; et al.

JAEA-Technology 2011-031, 123 Pages, 2012/01

JAEA-Technology-2011-031.pdf:16.08MB

The number of research reactors in the world is decreasing because of their aging. However, the planning to introduce the nuclear power plants is increasing in Asian countries. In these Asian countries, the key issue is the human resource development for operation and management of nuclear power plants after constructed them, and also the necessity of research reactor, which is used for lifetime extension of LWRs, progress of the science and technology, expansion of industry use, human resources training and so on, is increasing. From above backgrounds, the Neutron Irradiation and Testing Reactor Center began to discuss basic concept of a multipurpose low-power research reactor for education and training, etc. This design study is expected to contribute not only to design tool improvement and human resources development in the Neutron Irradiation and Testing Reactor Center but also to maintain and upgrade the technology on research reactors in nuclear power-related companies. This report treats the activities of the working group from July 2010 to June 2011 on the multipurpose low-power research reactor in the Neutron Irradiation and Testing Reactor Center and nuclear power-related companies.

Journal Articles

Neutron diffraction studies on strain evaluation of rebar in reinforced concrete

Suzuki, Hiroshi; Kanematsu, Manabu*; Kusunoki, Koichi*

Powder Diffraction, 24(Suppl.1), p.S68 - S71, 2009/06

It is typical method to measure the strains on a rebar in a reinforced concrete using strain gauges glued on the rebar. The waterproof treatment and wiring of the strain gauges, however, would affect the accuracy of the strain evaluation of the rebar in the reinforced concrete. In this study, neutron diffraction technique, which is nondestructive and noncontact technique, was applied to the strain evaluation of the rebar in reinforced concrete in order to solve above problems. It was confirmed that the absorption coefficient of concrete is smaller than that of steels, and that the effect of absorption of concrete on the accuracy of strain measurement is low. We measured strain distribution of the rebar in reinforced concrete, and the size of anchorage zone was evaluated. It was confirmed that the size of anchorage zone evaluated using neutron diffraction was smaller than that evaluated using strain gauges.

Oral presentation

Stress distribution measurement along rebar embedded in concrete using neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Harjo, S.

no journal, , 

In modern society, architectural and civil engineering structures such as reinforced concrete buildings require high seismic performance to minimize the "megarisk" exposed from urban earthquake hazards. In the reinforced concrete structures, the bond resistance between rebar and concrete is one important parameter for discussing its performance and it has been typically evaluated by measuring the strain distribution along the embedded rebar. However, it is difficult to evaluate the bond resistance accurately by strain gauges due to deterioration of bonding around the strain gauges. Here we present an in-situ strain and stress measurements for the rebar in the reinforced concrete using time-of-flight neutron diffraction as a novel alternative technique to typical strain gauges. It was demonstrated in this study that the three-dimensional deformation behavior of the embedded rebar in normal-strength concrete, cured in air, can be accurately measured under pull-out loading using time-of-flight neutron diffraction.

Oral presentation

Measuring strain distribution along rebar embedded in concrete using neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Harjo, S.

no journal, , 

Recently, architectural and civil engineering structures such as reinforced concrete buildings require high seismic performance. In reinforced concrete structures, the bond resistance between rebar and concrete is one important parameter for discussing the bond condition, and typically evaluated by measuring the strain distribution along the embedded rebar. In this study, we applied the time-of-flight neutron diffraction technique to the strain measurement of the rebar embedded in the reinforced concrete. The three-dimensional deformation behavior of the embedded rebar including the axial and lateral strains was accurately measured under loading. Furthermore, it was demonstrated that the strain distributions along rebar around cracks exposed in concrete can be measured by neutron diffraction. The neutron diffraction technique is expected to be a novel strain measurement method for structural engineering researches of reinforced concrete structures.

Oral presentation

Neutron engineering approach for structural engineering research of reinforced concrete

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Harjo, S.

no journal, , 

Neutron diffraction, which is a nondestructive and noncontact method for strain measurement, was applied to the strain measurement of rebar in the reinforced concrete. The three-dimensional deformation behavior of the embedded rebar including the axial and transverse strains was accurately measured under pullout loading using time-of-flight neutron diffraction. Furthermore, bond deterioration around the cracks in concrete and that around corroded rebar were successfully observed by measuring the strain distributions along rebar by neutron diffraction. The neutron diffraction technique is expected to be a novel strain measurement method for the rebar embedded in concrete for understanding actual phenomena on reinforced concrete structures.

Oral presentation

Neutron engineering application for structural engineering of reinforced concrete structure

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*

no journal, , 

In the modern society, architectural and civil engineering structures such as reinforced concrete buildings require high seismic performance to minimize the risk exposed from urban earthquake hazards. In the reinforced concrete structures, the bond resistance between rebar and concrete is one important parameter for discussing the bond condition, and typically evaluated by measuring the strain distribution along the embedded rebar. In this study, the time-of-flight neutron diffraction technique was applied to the strain measurement of the rebar embedded in concrete. The three-dimensional deformation behavior of the embedded rebar including the axial and transverse strains was accurately measured under pullout loading. Furthermore, bond deterioration around the cracks in concrete and that around corroded rebar were successfully observed by measuring the strain distributions along rebar by neutron diffraction. The neutron diffraction technique is expected to be a novel strain measurement method for the rebar embedded in concrete for understanding actual phenomena on reinforced concrete structures.

Oral presentation

Fundamental study on bond stress distribution of post-installed adhesive anchor using neutron diffraction

Tsuchiya, Naoko*; Mukai, Tomohisa*; Kusunoki, Koichi*; Kanematsu, Manabu*; Kabayama, Kenji*; Suzuki, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Bending bond stress evaluation of RC member using TOF neutron diffraction

Satake, Kosuke*; Kusunoki, Koichi*; Mukai, Tomohisa*; Kanematsu, Manabu*; Koyama, Taku*; Suzuki, Hiroshi

no journal, , 

no abstracts in English

Oral presentation

Recent progress on structural engineering studies of reinforced concrete using neutron diffraction

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Mukai, Tomohisa*

no journal, , 

Oral presentation

Experimental study for flexural bonding on reinforced concrete structure using neutron diffraction, 1; Application of neutron stress measurement

Suzuki, Hiroshi; Satake, Kosuke*; Kusunoki, Koichi*; Kanematsu, Manabu*; Mukai, Tomohisa*

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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