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Journal Articles

Analysis of atomistic structural deformation characteristics of calcium silicate hydrate in 53-year-old tricalcium silicate paste using atomic pair distribution function

Bae, S.*; Jee, H.*; Suh, H.*; Kanematsu, Manabu*; Shiro, Ayumi*; Machida, Akihiko*; Watanuki, Tetsu*; Shobu, Takahisa; Morooka, Satoshi; Geng, G.*; et al.

Construction and Building Materials, 237, p.117714_1 - 117714_10, 2020/03

 Times Cited Count:0 Percentile:100(Construction & Building Technology)

Journal Articles

The Effect of rehydration on bond strength of reinforced concrete subjected to high temperature

Miyabe, Azusa*; Koyama, Taku*; Nishio, Yuhei*; Suzuki, Hiroshi; Kanematsu, Manabu*

Konkurito Kozobutsu No Hoshu, Hokyo, Appuguredo Rombun Hokokushu (CD-ROM), 19, p.59 - 64, 2019/10

no abstracts in English

Journal Articles

Evaluation of deformation and fracture behavior of reinforced concrete using neutron beam technique

Ueno, Kazuki*; Suzuki, Hiroshi; Koyama, Taku*; Nishio, Yuhei*; Kanematsu, Manabu*

Konkurito Kozobutsu No Hoshu, Hokyo, Appuguredo Rombun Hokokushu (CD-ROM), 18, p.647 - 650, 2018/10

no abstracts in English

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

Verification on recovery performance of repaired reinforced concrete using neutron beam technology

Sekine, Mariko*; Suzuki, Hiroshi; Kanematsu, Manabu*

Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 40(1), p.1545 - 1550, 2018/07

no abstracts in English

Journal Articles

Deformation analysis of reinforced concrete using neutron imaging technique

Koyama, Taku*; Ueno, Kazuki*; Sekine, Mariko*; Matsumoto, Yoshihiro*; Kai, Tetsuya; Shinohara, Takenao; Iikura, Hiroshi; Suzuki, Hiroshi; Kanematsu, Manabu*

Materials Research Proceedings, Vol.4, p.155 - 160, 2018/05

 Times Cited Count:0 Percentile:100

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

Pair distribution function analysis of nanostructural deformation of calcium silicate hydrate under compressive stress

Bae, S.*; Jee, H.*; Kanematsu, Manabu*; Shiro, Ayumi*; Machida, Akihiko*; Watanuki, Tetsu*; Shobu, Takahisa; Suzuki, Hiroshi

Journal of the American Ceramic Society, 101(1), p.408 - 418, 2018/01

 Times Cited Count:6 Percentile:39.32(Materials Science, Ceramics)

Despite enormous interest in calcium silicate hydrate (C-S-H), its detailed atomic structure and intrinsic deformation under an external load are lacking. This study demonstrates the nanostructural deformation process of C-S-H in tricalcium silicate (C$$_{3}$$S) paste as a function of applied stress by interpreting atomic pair distribution function (PDF) based on in situ X-ray scattering. Three different strains in C$$_{3}$$S paste under compression were compared using a strain gauge and the real and reciprocal space PDFs. PDF refinement revealed that the C-S-H phase mostly contributed to PDF from 0 to 20${AA}$ whereas crystalline phases dominated that beyond 20${AA}$. The short-range atomic strains exhibited two regions for C-S-H: I) plastic deformation (0-10 MPa) and II) linear elastic deformation ($$>$$10 MPa), whereas the long-range deformation beyond 20${AA}$ was similar to that of Ca(OH)$$_{2}$$. Below 10 MPa, the short-range strain was caused by the densification of C-S-H induced by the removal of interlayer or gel-pore water. The strain is likely to be recovered when the removed water returns to C-S-H.

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:45.89

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

Nanostructural deformation analysis of calcium silicate hydrate in Portland cement paste by atomic pair distribution function

Suzuki, Hiroshi; Bae, S.*; Kanematsu, Manabu*

Advances in Materials Science and Engineering, 2016, p.8936084_1 - 8936084_6, 2016/00

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

The deformation behavior of nanostructure of calcium silicate hydrate (CSH) in Portland cement (PC) paste under compression was successfully characterized by the atomic pair distribution function (PDF) measured by using Synchrotron X-rays. The PDF of the PC paste showed a unique deformation behavior for a short range order below 2.0 nm in radius corresponding to the size of the CSH particle (globule), while the deformation for a long range order was similar to that of a calcium hydroxide phase measured by the diffraction peak shift. The compressive deformation of the CSH nanostructure can be divided into three stages with different interactions between globules. This behavior would originate from the granular nature of CSH which deforms with increasing packing density by slipping the interfaces between globules, rearranging the overall CSH nanostructure. This study will lead to increasing applications of the PDF technique to provide clues for understanding the deformation mechanism of CSH in PC paste.

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:46.2(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.

Journal Articles

Quantification of water penetration into concrete through cracks by neutron radiography

Kanematsu, Manabu*; Maruyama, Ippei*; Noguchi, Takafumi*; Iikura, Hiroshi; Tsuchiya, Naoko*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.154 - 158, 2009/06

 Times Cited Count:51 Percentile:2.97(Instruments & Instrumentation)

Journal Articles

Evaluation of water transfer from saturated lightweight aggregate to cement paste matrix by neutron radiography

Maruyama, Ippei*; Kanematsu, Manabu*; Noguchi, Takafumi*; Iikura, Hiroshi; Teramoto, Atsushi*; Hayano, Hiroyuki*

Nuclear Instruments and Methods in Physics Research A, 605(1-2), p.159 - 162, 2009/06

 Times Cited Count:24 Percentile:13.06(Instruments & Instrumentation)

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.

Journal Articles

Visualization and quantification of water behavior around cracks by neutron radiography

Kanematsu, Manabu*; Noguchi, Takafumi*; Maruyama, Ippei*; Iikura, Hiroshi

Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 29(1), p.981 - 986, 2007/00

Neutron radiography is one of the non-destructive methods. In this research, neutron radiography was applied to visualize and quantify the water penetration into concrete through cracks. The radiographs were obtained by the TNRF (Thermal Neutron Radiography Facility) installed at a research reactor, JRR-3M, in the Japan Atomic Energy Agency (JAEA). The quantitative capability of neutron radiography for the water content and the penetration depth in cement paste specimen were confirmed. The effects of crack and water content on the velocity and the depth of water penetration into concrete were visualized with several concrete specimens, to which surface water was supplied through the container.

Oral presentation

Industrial application of neutron radiography in JAEA

Matsubayashi, Masahito; Yasuda, Ryo; Iikura, Hiroshi; Kanematsu, Manabu*; Moriya, Shinichi*; Kagawa, Hideshi*

no journal, , 

JRR-3 thermal neutron radiography facility (TNRF) had been mainly utilized by Japan Atomic Energy Agency (JAEA) staffs and researchers from universities since the installation in 1991. JAEA started the facilities sharing system in 2006 and opened the facilities to companies with rendering of service. The system consists of the priority category and the common category. Research results conducted in the common category are required to be published as a rule but those of the proprietary use are excepted. The proprietary use increases the number of TNRF users from companies. Ministry of Education, Culture, Sports, Science and Technology started the promotion program for neutron beam utilization technology transfer (common name: Trial Use Program) in 2006 through the priority category of the facilities sharing system. In this presentation, we introduce research results from Trial Use Program such as applications of neutron radiography to construction material and space rockets.

Oral presentation

Water determination considering volume ratio of paste and aggrigate in concrete by neutron radiography

Tsuchiya, Naoko*; Kanematsu, Manabu*; Noguchi, Takafumi*; Iikura, Hiroshi

no journal, , 

no abstracts in English

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.

33 (Records 1-20 displayed on this page)