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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.
Harjo, S.; Moriai, Atsushi; Aizawa, Kazuya; Ito, Takayoshi; Nakatani, Takeshi; Arai, Masatoshi; Tomota, Yo*; Akita, Koichi*; Morii, Yukio
no journal, ,
The Engineering Materials Diffractometer TAKUMI designed to solve many problems in materials science and engineering including investigations of stresses and crystallographic structures within engineering components is now being developed at J-PARC. The best resolution of this instrument is 0.15%, which will give good accuracies on the strain values. The incident fluxes simulated using a Monte Carlo simulation for 0.8-4.31 
wavelength bandwidth are 4.8
10
n/cm
/s for high intensity mode, and 2.210 n/cm/s for high resolution mode. The construction is now in the final step, and the commissioning will be started very soon.
Suzuki, Kenji*; Shobu, Takahisa; Tanaka, Keisuke*
no journal, ,
Akita, Koichi*; Ono, Yoshinori*; Shobu, Takahisa; Miyashita, Daisuke*; Yuri, Tetsumi*; Ogata, Toshio*; Oya, Shinichi*
no journal, ,
Shibano, Junichi*; Kajiwara, Kentaro*; Kiriyama, Koji; Shobu, Takahisa; Suzuki, Kenji*; Arai, Takayuki*; Miura, Setsuo*; Kobayashi, Michiaki*
no journal, ,