Japan Association for Building Research Promotion

Association for, Japan

Japan Association for Building Research Promotion

Association for, Japan
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Matsuzawa K.,Japan Building Research Institute | Kitsutaka Y.,Tokyo Metroplitan University | Abe M.,Kogakuin University | Kasami H.,Japan Association for Building Research Promotion | And 2 more authors.
Key Engineering Materials | Year: 2016

There are many papers on the effects of high temperature on concrete, but papers about properties of concrete subjected to lower elevated temperature such used in nuclear power plants are still limited. This paper presents the results of experiments conducted to determine the effects of term of exposure to elevated temperatures below the limit for concrete component in nuclear power plants. Sealed cured cylinders made of normal weight concrete containing ordinary portland cement were subjected to temperatures from 20 to 175°C without seal for 10, 30 and 90 days. After exposure, cylinders were tested for weight loss, compressive strength and static modulus of elasticity. © 2016 Trans Tech Publications, Switzerland.


Ishikawa Y.,Chigasaki Research Institute | Kasami H.,Japan Association for Building Research Promotion
AIJ Journal of Technology and Design | Year: 2012

The imperfect placing joint of concrete not only spoils the fine sight of a concrete structure, but has serious influence on the durability of concrete. In this study, the specimens of concrete which is used moderate heat cement and fly ash are prepared to have same compressive strength which is used normal portland cement, and the placing time interval and the placing method is selected as examination index. The quality of the placing joint of the concrete which is used moderate heat cement and fly ash is good as compared with that of ordinary portland cement.


Yamada K.,Toyota National College of Technology | Nakao M.,Yokohama National University | Yamazaki Y.,Japan Association for Building Research Promotion | Suzuki Y.,Ritsumeikan University
11th World Conference on Timber Engineering 2010, WCTE 2010 | Year: 2010

The horizontal resistant force of a mud plastered wall is influenced by mud plaster and lath, especially the strength of mud plaster. The relation between the mud plaster strength and the horizontal resistant force of mud plastered wall for Japanese traditional wooden structures is clarified by a finite element method.


Quan H.,Qingdao Agricultural University | Kasami H.,Japan Association for Building Research Promotion
Open Civil Engineering Journal | Year: 2013

This paper presents the test results of a series of experimental studies on the effects of type and replacement ratio of fly ash on strength and durability of concrete. 3 types of fly ashes are used in this research, the specific surface area of which are 5070 cm2/g, 3760 cm2/g and 1970 cm2/g, respectively. They satisfy the requirement of Type-1, Type-2 and Type-4 fly ashes in Japanese Industrial Standard. Ordinary Portland cement, river sand, crushed sandstone, water reducer and air entraining agent are used as well. The results indicate that drying shrinkage of concrete is reduced when cement is partially replaced by fly ash. Comparatively, Type-2 fly ash's addition leads to a more effective drying shrinkage reduction, and those with replacement ratios result in larger dry shrinkage reduction. Carbonation increases with the increase of replacement ratio of fly ash, and concrete with Type-1 fly ash has higher carbonation than those with Type-2 and Type-4 fly ashes. The carbonation rate is found to be linear with water cement ratio regardless of replacement ratio of fly ash. Durability factor decreases with the replacement ratio of fly ash after 300 freezing and thawing cycles. Also, durability factor of concrete containing Type-1 and Type-2 fly ashes with replacement ratio of 25% to 55% is higher than 80%. However, those with Type-4 fly ash show lower durability factor after 300 cycles. Concretes with 70% replacement of fly ash are not durable in spite of the type of fly ash or specific surface area. © Quan and Kasami; Licensee Bentham Open.


Quan H.-Z.,Qingdao Agricultural University | Kasami H.,Japan Association for Building Research Promotion
Scientific World Journal | Year: 2014

In order to improve the durability of fly ash concrete, a series of experimental studies are carried out, where durability improving admixture is used to reduce drying shrinkage and improve freezing-thawing resistance. The effects of durability improving admixture, air content, water-binder ratio, and fly ash replacement ratio on the performance of fly ash concrete are discussed in this paper. The results show that by using durability improving admixture in nonair-entraining fly ash concrete, the compressive strength of fly ash concrete can be improved by 10%-20%, and the drying shrinkage is reduced by 60%. Carbonation resistance of concrete is roughly proportional to water-cement ratio regardless of water-binder ratio and fly ash replacement ratio. For the specimens cured in air for 2 weeks, the freezing-thawing resistance is improved. In addition, by making use of durability improving admixture, it is easier to control the air content and make fly ash concrete into nonair-entraining one. The quality of fly ash concrete is thereby optimized. © 2014 Hong-zhu Quan and Hideo Kasami.


Quan H.,Qingdao Agricultural University | Kasami H.,Japan Association for Building Research Promotion
Advanced Materials Research | Year: 2011

In order to make clear of the effects of the change in fineness of fly ash on air-entrained concrete, 2 series of laboratory experiments were carried out using 6 kinds fly ash with the specific surface area in the range from 2500 to 4400cm 2/g. The test results indicated higher slump and lower air-entraining content and higher dosage of air-entraining agent for fly ash with higher specific surface area. Compressive strength was found to increase with the increases of specific surface area of fly ash, while drying shrinkage and carbonation were found to show different tendency with change in fineness of fly ash.


Nakao M.,Yokohama National University | Yamazaki Y.,Japan Association for Building Research Promotion
9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium | Year: 2010

In this paper, shear resistant performance of mud-plastered walls with various wall clays was evaluated. Firstly, material testing of 29 kinds of wall clays from all over Japan was conducted to have mechanical characteristics of them. Secondly, mud-plastered wall specimens with three different wall clays were manufactured and shear loading test of these specimens was conducted. Numerical analysis of mud-plastered walls using the results of the material testing of wall clays were also done and it was found that estimating maximum shear force of a mud-plastered wall from material strengths of a wall clay is possible. Finally, a distribution of maximum shear force of mud-plastered walls all over Japan was evaluated.


Nakao M.,Yokohama National University | Yamazaki Y.,Yokohama National University | Yamazaki Y.,Japan Association for Building Research Promotion
Journal of Structural and Construction Engineering | Year: 2010

In this study, estimation of maximum shear stress of mud-plastered wall based on material testing of Nakanuri mud was conducted. Firstly, the range of material strength of Nakanuri mud was investigated from the material testing of 29 kinds of Nakanuri mud all over Japan. Secondly, mud-plastered wall specimens using three Nakanuri muds chosen among the 29 kinds of Nakanuri mud were constructed. From the test results of the shear loading tests of the wall specimens, the relationship between the compressive strength of Nakanuri mud and the maximum shear stress of Nahmuri-layer of the wall specimen was evaluated. Finally, comparison between maximum shear stresses calculated from other test results of various mud-plastered walls and the shear stresses from this test results was conducted.


Quan H.,Qingdao Agricultural University | Kasami H.,Japan Association for Building Research Promotion
Applied Mechanics and Materials | Year: 2011

This paper presents the results of experimental study on the effects of addition of excessive volume of fly ash on the strength characteristics of concrete. Crushed stone aggregate concrete with the replacement ratio of fly ash to Portland cement of 0, 10%, 20%, 30%, 40%, 60% and 80% were tested for compressive strength and modulus of elasticity at the ages of 7 days, 28 days and 91 days. The test result indicated significant reduction in compressive strength with the increase of fly ash content, indication 90% reduction at 80% fly ash replacement. Reduction in modulus of elasticity was found to be less than those of compressive strength, indicating 60% reduction at 80% fly ash replacement. © (2011) Trans Tech Publications.


PubMed | Japan Association for Building Research Promotion and Qingdao Agricultural University
Type: | Journal: TheScientificWorldJournal | Year: 2014

In order to improve the durability of fly ash concrete, a series of experimental studies are carried out, where durability improving admixture is used to reduce drying shrinkage and improve freezing-thawing resistance. The effects of durability improving admixture, air content, water-binder ratio, and fly ash replacement ratio on the performance of fly ash concrete are discussed in this paper. The results show that by using durability improving admixture in nonair-entraining fly ash concrete, the compressive strength of fly ash concrete can be improved by 10%-20%, and the drying shrinkage is reduced by 60%. Carbonation resistance of concrete is roughly proportional to water-cement ratio regardless of water-binder ratio and fly ash replacement ratio. For the specimens cured in air for 2 weeks, the freezing-thawing resistance is improved. In addition, by making use of durability improving admixture, it is easier to control the air content and make fly ash concrete into nonair-entraining one. The quality of fly ash concrete is thereby optimized.

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