MAEKAWA Koichi

Affiliation

Faculty of Urban Innovation, Division of Urban Innovation

Job Title

Professor

Research Fields, Keywords

concrete engineering

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The Best Research Achievement in Research Career 【 display / non-display

The Best Research Achievement in the last 5 years 【 display / non-display

Education 【 display / non-display

  • 1980.4
    -
    1982.3

    The University of Tokyo   Department of Civil Engineering   Master Course   Completed

  • 1976.4
    -
    1980.3

    The University of Tokyo   Civil Engineering   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - The University of Tokyo

Campus Career 【 display / non-display

  • 2017.4
     
     

    Duty   Yokohama National UniversityFaculty of Urban Innovation   Division of Urban Innovation   Professor  

  • 2017.4
     
     

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Architecture,Infrastructure,Ocean Engineering and Ecosystem Science   Professor  

  • 2017.4
     
     

    Concurrently   Yokohama National UniversityCollege of Urban Sciences   Department of Civil Engineering    Professor  

  • 2017.4
     
     

    Concurrently   Yokohama National UniversityGraduate School of Urban Innovation   Department of Infrastructure and Urban Society   Professor  

External Career 【 display / non-display

  • 2018.6
     
     

    The University of Tokyo   Professor Emeritus  

  • 2016
     
     

    Nanyang Technological University   Professor  

  • 2015
     
     

    Asian Institute of Technology   Professor  

  • 1996.4
    -
    2018.3

    The University of Tokyo   Department of Civil Engineering   Professor  

  • 1992.5
    -
    1994.4

    Asian Institute of Technology   Structural Engineering Division   Associate Professor  

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Academic Society Affiliations 【 display / non-display

  • 1980.4
     
     
     

    Japan Society of Civil Engineers

  • 1980.4
     
     
     

    Japan Concrete Institute

  • 2019.4
     
     
     

    日本機械学会

  • 2005
     
     
     

    地盤工学会

  • 2004
     
     
     

    Asian Concrete Federation

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Research Areas 【 display / non-display

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Civil engineering material, execution and construction management

 

Research Career 【 display / non-display

  • Life cycle infra-stock assessment and management

    The Other Research Programs  

    Project Year: 2007.4

  • Thermodynamics and durability mechanics of structural concrete

    Basic Science Research Program  

    Project Year: 1992.4

  • Nonlinear dynamic analysis of reinforced concrete structures

    Basic Science Research Program  

    Project Year: 1988.4 - 2005.3

  • Development of self-compacting concrete

    Pre-Project Research on Leading Construction Technology  

    Project Year: 1985.4 - 1990.3

  • Constitutive Modeling of Reinforced Concrete

    Basic Science Research Program  

    Project Year: 1982.4 - 1992.3

Books 【 display / non-display

  • Multi-Scale Modeling of Structural Concrete

    Koichi Maekawa, Tetsuya Ishida, Toshiharu Kishi( Role: Joint author ,  All chapters)

    CRC Press  ( ISBN:9780415465540

    Amazon

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    Total pages:658   Responsible for pages:all   Language:English Book type:Scholarly book

  • Nonlinear Mechanics of Reinforced Concrete

    Koichi Maekawa, Amon Pimanmas, Hajime Okamura( Role: Joint author ,  All chapters)

    CRC Press  ( ISBN:9780415271264

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    Total pages:768   Responsible for pages:all   Language:English Book type:Scholarly book

  • Modelling of Concrete Performance

    Koichi Maekawa, Rajesh Chaube, Toshiharu Kishi( Role: Joint author)

    CRC Press  ( ISBN:9780429081002

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    Total pages:328   Language:English Book type:Scholarly book

  • High Performance Concrete

    Hajime Okamura, Koichi Maekawa, Kazumasa Ozawa( Role: Joint author)

    ( ISBN: 4-7655-1530-3

    Amazon

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    Total pages:270   Language:Japanese Book type:Scholarly book

  • Nonlinear Analysis and Constitutive Models of Reinforced Concrete

    Hajime Okamura, Koichi Maekawa( Role: Joint author)

    ( ISBN:4765515060

    Amazon

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    Total pages:182   Language:English Book type:Scholarly book

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Thesis for a degree 【 display / non-display

Papers 【 display / non-display

  • Experimental study on time-dependent DC resistivity of cement-based material considering microstructure and ion concentration

    Yizhan Peng, Fuyuan Gong, Zhao Wang, Yuxi Zhao, Weiliang Jin, Tao Meng, Koichi Maekawa

    Construction and Building Materials   363   2023.1  [Reviewed]

    DOI

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Single Work  

  • Corrosion Crack Morphology and Creep Analysis of Members Based on Meso-Scale Corrosion Penetration

    Bin Zeng, Yiping Yang, Fuyuan Gong and Koichi Maekawa

    Materials   15 ( 20 )   2022.10  [Reviewed]  [Invited]

    DOI Web of Science

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Single Work  

  • Extended Multi-directional Crack Model Applied to the RC Precast Joint Interface with Shear Dowel

    Edom Zewdie, Masoud Soltani, Koichi Maekawa

    Journal of Advanced Concrete Technology   20 ( 8 )   535 - 549   2022.8  [Reviewed]

    DOI Web of Science CiNii Research

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Concrete Institute   Single Work  

  • Multi-ion kinetics in pseudo- concrete electrolyte associated with macro-cell corrosion

    Zhao Wang, Koichi Maekawa, Hiroki Takeda, Fuyuan Gong

    Cement and Concrete Composites   133   2022.7  [Reviewed]

    DOI Web of Science

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Single Work  

  • Modeling of path-dependent phase change in sorption and freezing of pore water for cementitious materials

    Fuyuan Gong, Stefan Jacobsen, Pengfei Li, Zhao Wang, KoichiMaekawa, Marcin Koniorczyk

    Journal of Building Engineering   57 ( 1 )   2022.7  [Reviewed]

    DOI Web of Science

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Single Work  

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Review Papers 【 display / non-display

  • 施工現場の生産性向上に資するレディーミクストコンクリート品質管理・検査の省人化・省力化および高度化に関する提案

    橋本 学、坂田 昇、前川宏一、原田修輔

    月刊コンクリートテクノ   40 ( 11 )   52 - 57   2021.11  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)   Publisher:セメント新聞社   Joint Work  

  • 画像解析とAIを活用したフレッシュコンクリートのコンシステンシー評価手法の全数管理への適用性

    大友健・畠山峻一・清水堅・前川宏一

    コンクリート工学   59 ( 7 )   589 - 597   2021.7  [Reviewed]  [Invited]

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本コンクリート工学会   Single Work  

  • 洋上風力発電推進のための最近のコンクリート技術

    藤山知加子,前川宏一

    日本風力エネルギー学会誌   44 ( 4 )   587 - 590   2021.2

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本風力エネルギー学会誌   Joint Work  

  • 床版の調査・診断技術(特集:総論:道路橋床版の調査・診断の高度化技術)

    前川宏一

    橋梁と基礎   54   2020.8

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:建設図書   Single Work  

  • 都市と国土の更新に向けたコンクリート構造

    前川宏一

    コンクリート工学   58 ( 5 )   334 - 339   2020.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:日本コンクリート工学会   Single Work  

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Industrial Property Rights 【 display / non-display

  • 床版構造体の施工方法

    前川宏一,石田哲也,荒井明夫,岩城一郎

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    Application no:JP20150080197  Date applied:2015.4.9

    Announcement no:JP2016199904  Date announced:2016.12.1

    Patent/Registration no:JP6512908B  Date issued:2019.5.15

    Country of applicant:Domestic  

  • コンクリート舗装構造体の施工方法

    岩城一郎,荒井明夫,石田哲也,前川宏一

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    Application no:JP20150080252  Date applied:2015.4.9

    Announcement no:JP2016199908  Date announced:2016.12.1

    Country of applicant:Domestic  

  • 鉄筋コンクリートの補強構造及び補強工法

    前川宏一,平塚慶達

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    Application no:JP20150050299  Date applied:2015.3.13

    Announcement no:JP2016169543  Date announced:2016.9.23

    Country of applicant:Domestic  

  • 構造物情報提供システム

    菅野晶夫,矢野裕司,尾暮敏範,津野和宏,石田哲也,前川宏一,土橋 浩

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    Application no:JP20150019759  Date applied:2015.2.3

    Announcement no:JP2016142662  Date announced:2016.8.8

    Patent/Registration no:JP6284240B  Date issued:2018.2.28

    Country of applicant:Domestic  

  • コンクリートの補強構造及びその補強工法

    平塚慶達,前川 宏一

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    Application no:JP20140141053  Date applied:2014.7.9

    Announcement no:JP2016017330  Date announced:2016.2.1

    Patent/Registration no:JP6511231B  Date issued:2019.5.15

    Country of applicant:Domestic  

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Awards 【 display / non-display

  • Best Research Award

    2022.3   Yokohama National University  

    Individual or group name of awards:Koichi Maekawa

  • 日本コンクリート工学会賞論文賞

    2021.6   日本コンクリート工学会   Thermo-Mechanistic Multi-Scale Modeling of Structural Concrete at High Temperature

    Individual or group name of awards:岩間慧大,樋口和朗,前川宏一

  • The three excellent papers of the year 2019-2020

    2020.9   Journal of Advanced Concrete Technology   Thermo-mechanistic multi-scale modeling of structural concrete at high temperature

    Individual or group name of awards:Keitai Iwama, Kazuaki Higuchi, Koichi Maekawa

  • Japan Concrete Institute Prize (research)

    2019.6   Japan Concrete Institute   Computational Life Assessment of ASR-damaged RC Decks by Site-Inspection Data Asimilation

    Individual or group name of awards:Yuya Takahashi, Yasushi Tanaka, Koichi Maekawa

  • Japan Concrete Institute Prize (research)

    2018.6   Japan Concrete Institute   Remaining Fatigue Life Assessment of Damaged RC Decks -Data Assimilation of Multi-scale Model and Site Inspection-

    Individual or group name of awards:Yasushi Tanaka, Yuya Takahashi, Koichi Maekawa

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 構造コンクリートの長期安全性評価と広帯域温度に対応した複合耐久性力学

    2020.11 - 2023.3

    科学研究費補助金  Grant-in-Aid for JSPS Fellows

    Investigator(s):前川宏一

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    Grant type:Competitive

  • 広帯域環境下にあるセメント系複合材料の耐久性力学と構造性能評価

    2020.4 - 2023.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(A)

    Investigator(s):前川宏一

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    Grant type:Competitive

  • Long-term dynamic simulation of large-scale RC-PC infrastructures based on quasi thermo-hygral modeling

    2011.4 - 2016.3

    Grant-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research(S)

    Investigator(s):Koichi Maekawa

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    Grant type:Competitive

  • コンクリート系床版に内在する凝縮水の動態による早期疲労限界状態

    2011.4 - 2012.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(A)

    Investigator(s):前川宏一

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    Grant type:Competitive

  • 高サイクル荷重と環境作用を同時に受けるコンクリート構造のマルチスケール耐久性力学

    2008.4 - 2011.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(A)

    Investigator(s):前川宏一

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    Grant type:Competitive

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Other external funds procured 【 display / non-display

  • 道路インフラマネジメントサイクルの展開と国内外への実装を目指した統括的研究

    2018.4 - 2019.3

    Japan Science and Technology Agency  戦略的イノベーション創造プログラム(SIP)

    Investigator(s):石田哲也

  • 道路インフラマネジメントサイクルの展開と国内外への実装を目指した統括的研究

    2013.11 - 2018.3

    Japan Science and Technology Agency  戦略的イノベーション創造プログラム(SIP)

    Investigator(s):前川宏一

  • 非線形疲労応答解析に基づくコンクリート系橋梁床版の余寿命推定システム

    2010.8 - 2012.3

    Ministry of Land, Infrastructure and Transport  国土交通省建設技術研究開発助成制度

Presentations 【 display / non-display

  • ANALYTICAL STUDY ON LOAD-CAPACITY OF EMBEDDED JOINT OF HIGH AXIAL FORCE CFT COLUMN-RC FLOOR SLAB

    IWATA Shin, TOSAKI Takayuki, YASUHARA Makoto, IKEDA Manabu, SAKAGUCHI Junichi, MAEKAWA Koichi

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))  2022  Japan Society of Civil Engineers

    DOI CiNii Research

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    Event date: 2022

    Language:Japanese   Presentation type:Other  

    <p> In this paper, as a structure to integrate a high axial force subjected CFT column and the supported RC upper floor slab in a large underground box, a T-shaped joint is proposed, where the top end of the column is embedded in the floor slab. The loading capacity of the proposed joint is evaluated by means of a 3-D nonlinear FEM. This evaluation method is first developed and justified by analyzing the past reported results of the loading tests for a plus-shaped joint that integrates a penetrating CFT column and the supported RC intermediate floor slab. This proposed evaluation method reasonably estimates the damage area and its expanding extent under specific loading cases. The method can also derive the possibility of joint fracture taking place prior to the fracture of adjacent members, based on the change in rotating rigidity due to the rotation angle difference generated between the column axis and the slab axis. The established evaluation method is then applied to the proposed T-shaped joint, and it is confirmed to possess the required load capacity against the expected level of seismic forces without resulting in any preceding fracture or punching sheer fracture of the joint.</p>

  • Mesoscale Simulation of Ice-strengthening Effect in Cracks of Concrete Induced by Frost Damage

    Wang Zhao, Gong Fuyuan, Ueda Tamon, Maekawa Koichi

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan  2022  National Committee for IUTAM

    DOI CiNii Research

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    Event date: 2022

    Language:Japanese   Presentation type:Other  

    <p>Concrete suffers frost damage in cold and wet regions and cracks initiate to cause deterioration of material properties. When the damaged concrete with cracks serves in warm and humid condition, water may fill in the cracks which can provide additional load-carrying capacity to concrete when ice forms under freezing temperature again. To evaluate such ice-strengthening effect in cracks, this paper presents a mesoscale simulation with Rigid Body Spring Model (RBSM). The constitutive laws of normal and shear springs are modified to tackle with both damaging and strengthening impacts during freezing-thawing cycles (FTC). The static and fatigue behaviors of concrete are numerically analyzed with verification by experiment.</p>

  • Numerical Investigation of Spalling Characteristics of Ultra-High-Strength Concrete

    Iwama Keitai, Kato Yushi, Maekawa Koichi, Baba Shigeaki

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan  2022  National Committee for IUTAM

    DOI CiNii Research

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    Event date: 2022

    Language:Japanese   Presentation type:Other  

    <p>This paper numerically investigates the explosive spalling of ultra-high-strength concrete taking into consideration the impact of polypropylene (PP) fibers during high-temperature heating. The spalling model of the multi-scale platform was upgraded and validated by the experimental results of ultra-high-strength concrete. In this study, the limit state of spalling was improved based on the property of tension-softening behavior. The effect of PP fiber for explosive spalling was also investigated using the proposed model.</p>

  • Accelerated Moisture Transport through Local Weakness of High-Strength Concrete Exposed to High Temperature

    Iwama Keitai, Kato Yushi, Baba Shigeaki, Higuchi Kazuaki, Maekawa Koichi

    Journal of Advanced Concrete Technology  公益社団法人 日本コンクリート工学会

    DOI

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    Event date: 2021

    Language:Japanese   Presentation type:Other  

    <p>Spilling out of condensed liquid water from needle-like holes in high-strength concrete was experimentally observed under fire attack. The presence of these holes was found to prevent explosive spalling effectively in the vicinity of the holes during fire exposure tests. This spilling out occurred at about 10 to 30 minutes after the start of high temperature heating. These needle-like holes are defined herein as local weaknesses that may act as rapid paths of water permeation to reduce the risk of explosive spalling of cover concrete. The phase change of moisture from CSH solids to condensed liquid as well as free water in micro-pores was simulated by a multi-phase chemo-physics analysis of ultra-high-strength concrete. The prediction of the high-rate phenomena was experimentally proved by using embedded moisture sensor, and the high-rate discharge of condensed water though local weaknesses was analytically simulated.</p>

  • Applicability to Total Measurement of Consistency Evaluation Method for Fresh Concrete using Image Analysis and Artificial Intelligence

    Ohtomo T., Hatakeyama S., Shimizu K., Maekawa K.

    Concrete Journal  2021  Japan Concrete Institute

    DOI CiNii Research

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    Event date: 2021

    Language:Japanese   Presentation type:Other  

    <p>The authors are developing an AI-based total measurement method to determine the slump value of concrete by analyzing images of the concrete flowing down the chute of a truck agitator as an alternative to the slump test that has been in use for many years as an acceptance test for ready-mixed concrete. In FY2020, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) implemented the Project on Introduction and Utilization of Innovative Technologies for Drastic Improvement of Productivity at Construction Sites using the Public/Private R&D Investment Strategic Expansion PrograM, and the accuracy of AI-based estimation was confirmed through total measurement at actual construction sites. We also introduce findings that improve the accuracy of AI-based estimation by applying the principle of in-pipe flow with slip of Bingham fluid to concrete in the slump flow area.</p>

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Charge of on-campus class subject 【 display / non-display

  • 2022   International Project Management Studio

    Graduate School of Urban Innovation

  • 2022   Thermodynamics of Structural Concrete

    Graduate School of Urban Innovation

  • 2022   Topics in Machine Learning

    Graduate School of Urban Innovation

  • 2022   Thermodynamics of Structural Concrete

    Graduate School of Urban Innovation

  • 2022   Practicum and Internship Program

    Graduate School of Urban Innovation

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Committee Memberships 【 display / non-display

  • 日本学術会議

    2020.10  第三部会員(土木工学・建築学)

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    Committee type:Government 

  • 日本学術会議

    2017.10 - 2020.9  第三部会員・土木工学建築学委員会副委員長

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    Committee type:Government 

  • 土木研究所 外部評価委員会戦略的維持管理・更新分科会

    2016.4  分科会長

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    Committee type:Government 

  • コンクリート生産性向上検討協議会

    2016.4  会長

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    Committee type:Government 

  • 新道路技術会議

    2016 - 2020.9  委員長

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    Committee type:Government 

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