研究者データベース
Last Updated :2024/08/26
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プロフィール情報
所属
学位
プロフィール情報
姓
呉, オ名
多英, ダヨンID各種
202201015983653462
所属
業績リスト
学歴
- 2019年10月 - 2022年09月 東京大学 工学系研究科 建築学専攻
- 2011年10月 - 2013年09月 東京大学 工学系研究科 建築学専攻
- 2005年03月 - 2009年08月 漢陽大学校（ERICA、韓国） 工学部 建築工学科
論文
- Dayoung Oh, Ryoma Kitagaki, Takayoshi Masuo, Zhijiang Li, Ryo Kurihara, Takafumi Noguchi, Ippei MaruyamaCement and Concrete Composites 105731 - 105731 2024年08月
- Dayoung Oh, Ryoma Kitagaki, Takayoshi Masuo, Yasuhiro KurodaEnergy Reports 11 4008 - 4014 2024年06月Quantitative analysis, such as thermogravimetric analysis (TGA), is often used to evaluate the CO2 absorption of building materials. However, as interest in CO2 absorption of building materials increases, a more universal and practical evaluation method has been required. This paper explains the mechanism of the “simple and visible” CO2 absorption evaluation device produced by the authors as a prototype and reports the CO2 absorption evaluation method and results. Experiments using the device showed that the higher the water-to-cement ratio and the larger the specific surface area of the hardened cement paste, the higher the CO2 absorption rate. Compared to the TGA results, a slight error occurred, which appeared to be due to an increase in vapor pressure due to H2O generated through the carbonation reaction. The device is useful when it is difficult to use expensive equipment because quantitative evaluation is possible if basic physical information is known in advance.
- Dayoung Oh, Takafumi Noguchi, Yutaka Aikawa, Ryoma KitagakiPowder Technology 436 2024年03月01日In this study, a formula for estimating the solidification tensile strength caused by interparticle force with arbitrary particle size distributions was proposed based on Rumpf's formula, originally designed for predicting the tensile strength of solidifications comprised of particles with identical diameters. To estimate the capillary force between unequal-sized spherical particles, the approximate solution of Lian et al. was used. The proposed tensile strength equation changes depending on interparticle force, particle size distribution, the packing fraction and average coordination number. Using the proposed formula, the tensile strength according to the difference in particle size distribution was calculated under certain environmental conditions. The results showed that even if the median value of particle size was the same, the tensile strength varied because the packing fraction and surface area of particles per unit volume varied depending on the particle size distribution.
- Zhiwei Zhao, Dayoung Oh, Yuzhe Wang, Ryoma Kitagaki, Takayoshi Masuo16th International Conference on Durability of Building Materials and Components 2023年10月
- Yuzhe Wang, Dayoung Oh, Ryoma Kitagaki16th International Conference on Durability of Building Materials and Components 2023年10月
- ハイブリッド補修材で補修されたセメントペーストの炭酸化過程における長さ・質量変化率の湿度・CO2濃度依存性辻本亜美, 北垣亮馬, 呉多英日本コンクリート工学会年次論文集 45 1 1516 - 1521 2023年
- Development of Consolidation Plate with Red Clay for Wooden Structure Joint and Performance Evaluation under Different Curing MethodsDayoung Oh, Eunmi SHIN, Hyeonggil Choi, Juna LEEJournal of the Korean Society for Advanced Composite Structures 12 2 12 - 20 2021年04月
- Dayoung Oh, Takafumi Noguchi, Ryoma Kitagaki, Hyeonggil ChoiRenewable and Sustainable Energy Reviews 135 2021年01月The rapid industrial development and global population growth of the past century have resulted in an exponential increase of resource consumption and thus caused elevated CO2 emissions that, in turn, are held responsible for global warming and associated environmental problems that require urgent solutions. Specifically, increase of cement production causes CO2 pollution and generates a significant amount of concrete waste. Waste concrete, the major component of construction waste, can be efficiently recycled and is mainly used as a roadbed or backfill material. However, as no further resource recycling is expected for waste concrete, more efficient and productive recycling systems are sought after. Herein, waste concrete powder is used to produce added-value inorganic building materials, namely recycled cement and solidification. The characteristics of recycled cement (manufactured through calcination) are evaluated in terms of free lime content, mineral composition, density, color, flow test and strength, and the performance of recycled cement is found to be identical to that of ordinary Portland cement. X-ray diffraction and compressive strength analyses of the solidification manufactured through hydrothermal synthesis show that blocks of the desired strengths can be produced by adjusting the degree of consolidation and curing conditions. Based on these results, this study proposes a concrete waste recycling system to reduce the amount of construction waste and prevent resource depletion.
- Won Jun Park, Takafumi Noguchi, Sang Heon Shin, Da Young OhMagazine of Concrete Research 67 11 585 - 591 2015年06月01日Various empirical equations have previously been suggested for estimating the modulus of elasticity of concrete from its compressive strength. In addition, a considerable number of practical and universal equations have been proposed for predicting the modulus of elasticity when the product includes coarse aggregates and various types of mineral additions. However, such equations are not applicable to the whole data for recycled aggregate concrete because its mechanical properties depend greatly on both the type of aggregates recycled and the ratio of the mix proportions within such concrete. In this study, more than 1300 experimental data obtained from studies performed between 1980 and 2012 in Japan and Korea were used to statistically analyse the relationship between compressive strength and modulus of elasticity. The compressive strength of recycled aggregate concrete was found to range between 18 and 65 MPa, and therefore a prediction equation is proposed for recycled aggregate concrete that considers the ratio and types of recycled coarse aggregates used.
- Da Young Oh, Takafumi Noguchi, Ryoma Kitagaki, Won Jun ParkRenewable and Sustainable Energy Reviews 38 796 - 810 2014年10月CO2 emitted from calcination processes in kilns comprises 60% of all emissions from cement production. The chemical components of building materials, demolished inorganic building materials (DIBMs), and waste concrete powder (WCP) are similar to those of cement minerals. Therefore, if DIBMs are used as a cement substitute material along with limestone, the quantity of disposed waste and the use of limestone will likely be reduced, as will CO 2 emissions during cement production. This study proposes a recycling method for recycled cement, using DIBMs and WCP as cement substitute materials, and the properties of trial recycled cement were evaluated. The mortar specimen using recycled cement showed a high compressive strength, as did the ordinary Portland cement mortar. According to the proposed composition, the producible recycled cement was derived from 0.5% to 9.1% of annual cement production (about 57.6 million tons) in Japan. Additionally, the CO2 reduction by usage of recycled cement ranged from 0.06 million tons to 0.72 million tons from the total annual CO2 emissions from cement production (about 29.4 million tons), using natural resources in Japan. © 2014 Elsevier Ltd.
- 東日本大震災における津波による住宅の塩害被害に関する調査福山 智子, 呉 多英, 西脇 智哉, 野口 貴文コンクリート工学年次論文集 34 1 838 - 843 2012年06月
MISC
講演・口頭発表等
- コンクリート試料の密度分布と炭酸化深度を分析す るためのハイパースペクトルデータのイメージング王宇哲, 北垣亮馬, 呉多英コンクリート工学年次大会2024年 2024年06月
- THE STUDY ON THE CARBONATION PROMOTION PROCESS OF HARDENED CEMENT PASTE IN THE DRIPPING METHOD金亜銘, 呉多英, 北垣亮馬コンクリート工学年次大会2024年 2024年06月
- 水酸化カルシウム懸濁溶液を用いた炭酸化反応を促 進するアミンのスクリーニング法の構築北垣亮馬, 呉多英, 潘談, 齊藤亮介コンクリート工学年次大会2024年 2024年06月
- C/S 比および湿度による合成C-S-H の炭酸化挙動に 関する基礎的な研究呉多英, 鄭添龍, 張峻山, 北垣亮馬セメント技術大会2024年 2024年05月
- Evaluation of Carbonation Degree of Hardened Cement Paste with Different Water-Cement Ratio in Wet-Dry CycleZhiwei ZHAO, Dayoung OH, Yuzhe WANG, Ryoma KITAGAKI, Takayoshi MASUOXVI International Conference on Durability of Building Materials and Components (DBMC 2023)
- Evaluate the ability to determine the carbonation depth of concrete by hyperspectral imagingYuzhe Wang, Dayoung Oh, Ryoma KitagakiXVI International Conference on Durability of Building Materials and Components (DBMC 2023)
- Mechanical properties of Hardened Cement Paste Containing AminesX. Zhuo, T. Pan, D. Oh, R. Kitagaki, Y. Elakneswaran, H. Senboku, R.Saito, K.Yano, Y. Yoda, M. Tsujino, A. NishidaThe 16th International Congress on the Chemistry of Cement 2023 (ICCC2023) 2023年09月
- Promoting Carbonization of Hardened Cement Paste by Wet-Dry CycleDayoung OH, Zhiwei Zhao, Yuzhe Wang, Ryoma Kitagaki, Takayoshi Masuo, Takafumi NoguchiThe 16th International Congress on the Chemistry of Cement 2023 (ICCC2023) 2023年09月
- モルタルの凍結融解抵抗性における化学混和剤の気泡による効果の再検証齊藤 陸斗, 北垣 亮馬, 呉 多英日本建築学会大会学術講演梗概集2023年
- ナノインデンテーション法を用いた弾性率測定に基づく養生日数と骨材の違いが遷移帯形成に及ぼす影響評価甲斐和樹, 北垣亮馬, Dayoung Oh, 依田侑也日本建築学会大会学術講演梗概集2023年
- 発砲ポリウレタン断熱材のセル界面部における結合分解制御メカニズムの導入による資源循環技術池田智裕, 北垣亮馬, 任裕彬, 呉多英日本建築学会大会学術講演梗概集2023年
- 促進紫外線暴露したポリウレタン塗膜の劣化による寸法変化メカニズムに関する基礎的研究鍋山哲史, 小師柚子, 北垣亮馬, 呉多英日本建築学会大会学術講演梗概集2023年
- 画像相関法を用いたポリウレタン塗膜の寸法変化に関する研究小師柚子, 鍋山哲史, 北垣亮馬, 呉多英日本建築学会大会学術講演梗概集2023年
- pyGCMSを用いたセメント硬化体―高分子劣化メカニズムの解明手法の構築に関する研究北居航, 北垣亮馬, 呉多英, 小島静日本建築学会大会学術講演梗概集2023年
- 相対湿度変化による合成C-S-Hの初期炭酸化挙動に関する研究呉多英, 鄭添龍, 尹戈喬, 李治江, 北垣亮馬日本建築学会大会学術講演梗概集2023年
- FUNDAMENTAL STUDY ON CARBONATION BOOSTING METHOD OF HARDENED CEMENT PASTEDayoung OH, Ryoma KITAGAKI, Yuzhe WANG, Ryo KURIHARA, Ippei MARUYAMA, Takayoshi MASUORILEM Week 2023 2023年09月
- ハイブリッド補修材で補修されたセメントペーストの炭酸化過程における長さ・質量変化率の湿度・CO2濃度依存性辻本 亜美, 北垣 亮馬, 呉 多英コンクリート工学年次大会2023年
- 建築材料の各種試験片を対象にしたCO2固定速度簡易評価装置の開発北垣亮馬, OH Dayoung, 増尾孝義, 黒田泰弘日本建築仕上学会大会学術講演会研究発表論文集 2023年
- モルタルの凍結融解抵抗性における化学混和剤の気泡による効果の再検証松島克矢, 齊藤陸斗, 呉多英, 北垣亮馬セメント技術大会講演要旨(CD-ROM) 2023年
- 水酸化ナトリウム水溶液と卵の殻を添加した土の耐水性および圧縮強度に関する基礎的研究OH Dayoung, 野口貴文日本建築学会大会学術講演梗概集・建築デザイン発表梗概集(CD-ROM) 2021年
- 呉 多英, 野口 貴文, 北垣 亮馬材料施工 2013年08月 日本建築学会
- 呉 多英, 山岸 英輝, 北垣 亮馬, 野口 貴文材料施工 2012年09月 日本建築学会
- 呉 多英, 朴 元俊, 申 尚憲, 野口 貴文学術講演梗概集. A-1, 材料施工 2011年07月 日本建築学会
- 朴 元俊, 呉 多英, 申 尚憲, 野口 貴文学術講演梗概集. A-1, 材料施工 2011年07月 日本建築学会
- 申 尚憲, 朴 元俊, 呉 多英, 野口 貴文学術講演梗概集. A-1, 材料施工 2011年07月 日本建築学会
- 再生骨材コンクリートにおける圧縮強度とヤング係数との関係朴元俊, 呉多英, 申尚憲, 野口貴文セメント技術大会講演要旨(CD-ROM) 2011年