Japan Testing Center for Construction Materials

Japan, Japan

Japan Testing Center for Construction Materials

Japan, Japan

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Sakuma E.,Kagoshima University | Nimiya H.,Kagoshima University | Nagata A.,Tokyo Metroplitan University | Hagihara S.,Japan Testing Center for Construction Materials
Journal of Environmental Engineering (Japan) | Year: 2017

In this study, we focused on the improvement of the additional thermal resistance of windows with shading devices. The measurement of the additional thermal resistance of windows with shading devices, such as blinds or roller screens was conducted for 64 cases under the identical test devices and conditions. The results were further analyzed in terms of gap in the opening, porosity of surface material, ventilation characteristics and emissivity, so as to verify the improved elements of additional thermal resistance. (1) To improve additional thermal resistance of the shading devices, the followings are the elements to consider: - Make the gaps of the shieling material smaller. - Use low emissivity material. - Make the heat resistance of the shading devices bigger. (2) Venetian blinds can have a better additional thermal resistance by adopting the high degree of shielding and air tightness. (3) Roller screens can have a better additional thermal resistance by adopting of low-emissivity screen and side rails. (4) Cellular screen has the highest thermal resistance among the shading devices, thanks to cellular structure and its air layer. The performance can be further improved by filling the gaps with side rails. The No.50, the best performance one, achieved an additional thermal resistance of over 0.5[W/m2K]. (5) Using two layers of shading devices helps the additional thermal resistance improve. (6) Measured values are mostly consistent with calculated values by ISO 15099. However, there are some different values between the measurement and the calculation. The desirable difference between the tested and the calculated value is within 10%. The evaluation method taking into account the air permeability (airleakage) of the window with shading devices and the emissivity of shield member is regarded as the future subject to examine, because it is valuable in terms of simplifying the evaluation of the additional thermal resistance of the window with shading devices. (7) Even though the improvement of the window's additional thermal resistance by using shading devices is an effective measure, it is regarded as the future subject to examine because the dew condensation possibly appear on the glass surface.


Kobayashi K.,University of Shizuoka | Hayashi K.,Japan Testing Center for Construction Materials | Yasumura M.,University of Shizuoka
WCTE 2016 - World Conference on Timber Engineering | Year: 2016

In this paper, cyclic bending tests of the screws were conducted and low cycle fatigue failure behaviour was evaluated. Moreover, the relationship between cyclic bending properties of screws and ductility for shear deformation of screwed joints were compared. From constant angle bending test, it is clarified that power rule was applicable between plastic bending deformation and number of cycles to failure. From test results under incremental schedule according to ISO16670, a fracture lifetime could be predicted by applying linear cumulative damage rule.


Hayasaki Y.,Japan Testing Center for Construction Materials | Shojo N.,Akashi National College of Technology | Miyoshi K.,Kyushu Sangyo University | Mori A.,Tokyo City University | Ohashi Y.,Tokyo City University
WCTE 2016 - World Conference on Timber Engineering | Year: 2016

A seismic design method for traditional Japanese timber structures is under development. In this study, we provide a description of a column with a spandrel wall, which is one of the structural features of traditional Japanese timber structures. This paper describes in-plane shear testing for a column with a spandrel wall and proposes a method to evaluate the shear performance of the structural model. The relationship between the load and the shear deformation angle has been clarified through such in-plane shear testing. This study proposes a structural model for determining the envelope of experimental results with regard to the load and the deformation angle, and shows that the experimental results and solution of the model equations have good correspondence until the shear deformation angle reaches approximately 1/250 radians.


Mori A.,Tokyo City University | Tabata C.,Mie University | Hayasaki Y.,Japan Testing Center for Construction Materials | Shojo N.,Akashi National College of Technology | And 2 more authors.
WCTE 2016 - World Conference on Timber Engineering | Year: 2016

The purpose of this research is to make clear the transition of the construction methods of the conventional wooden framed house in Japan. A new construction method spends time on spreading to the surrounding area. And it also gradually spreads to provincial area according to the economic condition. Therefore we divided residential area into "Metropolis" and "Provincial-city" in the research. We analysed the results of questionnaire survey and compared the construction methods according to the constructed year and the area. As a result of the research, the construction methods of the houses in "Metropolis" changed rapidly due to large earthquakes and the revision of the Japan Building Standard Law. And in "Provincial-city", two types of utilization rate could be found; one is gradually increasing and the other is increasing to catch up with "Metropolis" 10-20 years later.


Nakamura N.,Japan Testing Center for Construction Materials | Abe M.,Kogakuin University
AIJ Journal of Technology and Design | Year: 2014

In this investigation the trend of research on accelerated carbonation of concrete and the changes in the conditions of experiment were followed in Japan. A survey on the history of the standards of test for concrete was conducted in time series, a flow of enactment and revision of the standards was followed. In addition the test condition of JIS was compared with those of European methods and on the application of the standard of accelerated carbonation test for concrete, a statistical survey of the requested tests was conducted.


Yamashita H.,Japan Testing Center for Construction Materials | Yoshida T.,Chiba University | Shishikura D.,Japan Testing Center for Construction Materials | Tokoyoda M.,Japan Testing Center for Construction Materials | Hirashima T.,Chiba University
Journal of Structural and Construction Engineering | Year: 2016

In the present study, the influence of the curing conditions (air-dried, oven-dried and sealed curing) and water/cement ratios (40%, 50% and 65%) on the load- induced thermal strain (LITS) of concrete specimens was investigated. The relationship between the LITS and specimen weight loss was also evaluated in order to develop a comprehensive model for the LITS. It was clarified from the present study that LITS due to dehydration and decomposition was much larger than that due to water evaporation. And, the numerical model for the LITS was proposed as a function of the weight loss of the specimens.


Li Z.,Yamaguchi University | Ryuda Y.,Japan Testing Center for Construction Materials
AIJ Journal of Technology and Design | Year: 2012

For developing a technology to increase slag's use in concrete, in this study, we mixed two kinds of slag fine aggregates in concrete: slag from municipal waste ash (WAS) and blast furnace slag (BFS) or ferro nickel slag (FNS), substituting partly for sea sand, to investigate the effects of multi-slag's use and slag contents on concrete's properties. It was concluded that multi-slag's use doesn't greatly deteriorate fluidity, air content, compressive strength, Young's modulus and drying shrinkage, but reduces the carbonation resistance of concrete.


Kitsutaka Y.,Tokyo Metroplitan University | Uchida Y.,Japan Testing Center for Construction Materials | Matsuzawa K.,Tokyo Metroplitan University
Concrete Solutions - Proceedings of Concrete Solutions, 5th International Conference on Concrete Repair | Year: 2014

In this paper, the mechanical properties of corroded rebars in deteriorated reinforced concrete structures were investigated. Since reinforcing bars in concrete members bear tensile forces, their corrosion greatly damages the load-bearing capacity of reinforced concrete members. This study aims to investigate changes in the mechanical properties of deformed reinforcing bars of different types and sizes when they were subjected to salt spray testing. As a reinforcing bar is corroded and the cross-sectional area is reduced, the yield point linearly decreases. The rate of such reduction is common to all types, being independent of the strength and diameter of the bar. The apparentYoung's modulus linearly decreases as corrosion proceeds. The rate of such reduction is common to all types, being independent of the strength and diameter of the bar. © 2014 Taylor & Francis Group.


Fujita M.,Yamaguchi University | Hayashi T.,Yamaguchi University | Ryuda Y.,Japan Testing Center for Construction Materials | Ono F.,Manager Inc.
AIJ Journal of Technology and Design | Year: 2016

Thin steel plates galvanized are used for steel-framed house, roof and wall and their metal fittings of building structures. There are corrosion, fatigue, thermal effects and surface defects in the factors of deterioration of steel material. Corrosion occurs such as a thin steel plate, as well as the usual steel caused by the presence of moisture and oxygen, depending on the environmental conditions, the degree and form of the corrosion are different. Not only flat portion but also cut edge portion of metal fitting using a thin steel plate in corrosion resistance are different. In this paper, combined cyclic test of various specifications of metal fittings for folded-plate roof using thin steel plates is conducted and corrosion resistance of metal fittings is evaluated.


Ito Y.,Japan Testing Center for Construction Materials | Makitani E.,Kanto Gakuin University | Mogi J.,Maeda Technology
Journal of Structural and Construction Engineering | Year: 2013

The structural characteristics of new seismic retrofitting methods for existing RC columns which were wrapped with the divided thin steel plates and continuous fiber sheets was discussed in the previous papers It was confirmed that the flexural resistance was significantly improved. Therefore the proposed methods in our previous paper is expected as an useful repairing and strengthening methods for the columns damaged by earthquakes. In this research to examine the ultimate flexural strength of RC columns wrapped by the same means repairing and re-retrofitting specimens were tested again. The test results indicated that the calculated value by current ultimate flexural capacity formula was underestimate these results because the lateral confinement caused by steel plates and fiber sheets effect on the design of a column was generally unconsidered. Then authors obtained a one solution of increasing effect of flexural strength based on the arch mechanism model by plane stress fields theory.

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