著者
桝田 佳寛 野口 貴文 兼松 学
出版者
公益社団法人 日本コンクリート工学会
雑誌
コンクリート工学 (ISSN:03871061)
巻号頁・発行日
vol.43, no.2, pp.11-18, 2005-02-01 (Released:2013-04-26)
参考文献数
6

2004年3月, 日本建築学会「鉄筋コンクリート造建築物の耐久設計施工指針 (案) ・同解説」が発刊された。本指針は, 建築学会の材料施工分野において初めて性能設計に具体的に踏み込み, 今後の材料施工分野の雛型となるべく性能指向型の指針として提案したものである。具体的には, 性能規定としての耐久性能の整理と理論体系の構築を行い, 「性能検証型一般設計法」および「標準仕様選択型設計法」, 「性能検証型特別設計法」の3つの設計ルートから成る耐久設計の枠組みを提案した。また, 構造体および部材の限界状態の設定方法を性能論的な観点からまとめ, 鉄筋, コンクリート, 仕上材など各材料の限界状態との関係から定義した点で意義深い。
著者
梶田 秀幸 中田 善久 桝田 佳寛 笹倉 博行
出版者
日本建築学会
雑誌
日本建築学会構造系論文集 (ISSN:13404202)
巻号頁・発行日
vol.84, no.761, pp.905-915, 2019 (Released:2019-07-30)
参考文献数
19

In this study, with high strength concrete ranging from slump 21 cm up to slump flow 60 cm as the applicable range; in order to shed light on the steady-state flow of fresh concrete in inclined flow test apparatus, we compared and examined the velocity at the tip of the flow determined the vicinity of the gate and the velocity at the tip of the flow of the inclined portion determined from near the end of the test apparatus. Then, based on the relationship between the apparent shear strain rate and the apparent shear stress determined from the velocity at the tip of the flow of near the end of the test apparatus in the inclined portion, we calculated the apparent yield value and the apparent plastic viscosity, and we examined it appropriateness by comparing with the yield value and the plastic viscosity calculated by Terada et al. In addition, we carried out a pumping experiment with an actual pipe length of about 35m, and in addition to confirming the appropriateness of the apparent yield value and the apparent plastic viscosity from the change in the quality of concrete before and after pumping, with regard to evaluation of pumpability of concrete from the relation of pressure loss inside the pipe, we compared and examined with the outcome of the studies conducted by Wami et al. and Terauchi et al. As a result, the following findings were obtained. (1) By measuring the velocity at the tip of the flow of near the end of the test apparatus in the flow portion of the inclined flow test apparatus, we measure the velocity at the tip of the flow where deformation and flow due to the weight of the concrete is close to the steady-state flow, and we could obtain appropriate apparent yield value and apparent plastic viscosity. (2) We proposed the test method of apparent rheological constants determined from the velocity at the tip of the flow of near the end of the test apparatus in the flow part of the inclined flow test apparatus. (3) As a result of investigating the changes in the quality of concrete before and after pumping, values of the apparent yield value and the apparent plastic viscosity obtained from the inclined flow test were appropriate, and the apparent plastic viscosity may evaluate the viscosity of the concrete. (4) As a result of investigating the relationship with pressure loss inside the pipe, it was found that the apparent plastic viscosity obtained from the inclined flow test shows the plastic viscosity of concrete, and it suggested that it may be possible to evaluate the pressure loss inside the pipe from the product of apparent plastic viscosity and actual discharge amount.
著者
齋藤 榮 田熊 亮史 桝田 佳寛 小西 敏正 李 榮蘭 一山 くるみ
出版者
日本建築学会
雑誌
日本建築学会技術報告集 (ISSN:13419463)
巻号頁・発行日
vol.16, no.34, pp.1165-1170, 2010
被引用文献数
2

Jiyugakuen Myonichikan was designed by Frank Lloyd Wright and his disciple Arata Endo. The Myonichikan was designated as an important cultural property in May 1997. Oya-stone is used extensively in the Myonichikan as well as in Imperial Hotel in Tokyo beacase it is soft enough in which to carve geometrical patterns. However it also deteriorates easily. Because the Myonichikan had become superannuated many parts of Oya-stone have deteriorated and there were structural problems. Therefore restoration work was conducted from 1999 to 2001. This paper arranges details of restoration according to various building structures where Oya-stone is used such as basements, columns, fireplace, chimney, etc. This will provide important data for restoration and preservation of buildings using Oya-stone.
著者
三好 征夫 桝田 佳寛 安田 正雪 荒金 直樹
出版者
公益社団法人日本コンクリート工学会
雑誌
コンクリート工学年次論文報告集 (ISSN:13404741)
巻号頁・発行日
vol.20, no.2, pp.361-366, 1998-06-30
被引用文献数
2

通常の強度レベルで目標スランプフローが450mmの,若干の締固めは必要であるが,流動性に優れ,じゃんかなどの施工欠陥を作りにくい分離低減剤を用いた準高流動コンクリートの開発を目標として,高性能AE減水剤や分離低減剤の使用量,粗骨材量を変化させて,スランプフローやVロート流下時間などのフレッシュ性状や硬化物性を検討した。この結果,準高流動コンクリートは,少量の分離低減剤を使用し,350〓/m3程度の粗骨材量で,建築用の軟練りのコンクリートと高流動コンクリートの中間に位置する諸性状を有することが明らかとなった。
著者
宮野 和樹 桝田 佳寛 中村 成春 五味 信治
出版者
日本建築学会
雑誌
日本建築学会構造系論文集 (ISSN:13404202)
巻号頁・発行日
vol.69, no.575, pp.1-6, 2004
被引用文献数
1 1

The influence of quantity and shape of coarse aggregate and flowability of mortar on flowability of self-compacting concrete is investigated in this study. The coefficient of thickness of mortar layer is introduced based on coefficient of coarse aggregate's shape, quantity of coarse aggregate and solid content in coarse aggregate. The coefficient of coarse aggregate's shape is introduced by projection circumference, projection area, volume and grading of coarse aggregate. The flowability of self-compacting concrete can be estimated by coefficient of thickness of mortar layer and flowability of mortar.