Updated on 2022/01/24

写真a

 
YANG, Yizhou
 
Affiliation
Faculty of Science and Engineering, Waseda Research Institute for Science and Engineering
Job title
Junior Researcher(Assistant Professor)
Mail Address
メールアドレス

Concurrent Post

  • Faculty of Science and Engineering   School of Creative Science and Engineering

Education

  • 2016.10
    -
    2019.09

    Nagoya University   Graduate School of Engineering   Civil and Environmental Engineering  

Degree

  • 2019.09   Nagoya University   Ph.D.

Research Experience

  • 2020.04
    -
    Now

    Waseda University   Research Institute for Science and Engineering

Professional Memberships

  • 2017
    -
    Now

    日本コンクリート工学会

  • 2018
    -
     

    土木学会

 

Research Areas

  • Structure engineering and earthquake engineering

Research Interests

  • 非線形解析

  • コンクリート工学

Papers

  • Experimental study on bond behavior of corroded rebars coated by anti-corrosive materials in polymer cement mortar

    Mohammad Ridduhan L. Natino, Yizhou Yang, Hikaru Nakamura, Taito Miura

    Construction and Building Materials   300  2021.09  [Refereed]

     View Summary

    This study investigates the bond behavior of anti-corrosive coated corroded rebars in a polymer cement mortar (PCM) as a common patching material to repair corrosion-induced damaged reinforced concrete structures. Cementitious and epoxy types of anti-corrosive coating materials are utilized. The corroded rebars are prepared by accelerated corrosion test in laboratory with a 5–10% target corrosion degree. The single effect of the coating materials on the bond behavior is investigated using coated round and deformed rebars. The combined effects of the corrosion and the coating materials are investigated using coated corroded deformed rebars. To thoroughly understand the bond behavior and mechanism, the effects of the corrosion and the coating materials on the change in the geometrical properties and surface roughness of the rebars are quantitatively analyzed by laser scanning tests. Finally, a two-end pull-out test is conducted to measure and investigate the bond-slip relationship, ultimate bond strength, bond toughness, and bond ductility. Similar to the findings on cementitious coated deformed rebar confined in concrete in a previous study by the authors, the results of the current study revealed that in the PCM, the cementitious coated rebar presents promising good bond performance regardless of the corrosion degree compared to the epoxy coated rebar. This is because when the ribs of the deformed rebars would deteriorate owing to corrosion, the rough surface of a cementitious coated rebar can sustain well its bond performance compared with the smooth and glassy surface of an epoxy coated rebar. Moreover, the direct effect of the surface roughness characteristics of these coating materials is clarified using coated round rebars. Consequently, the cementitious coated rebar achieves a considerably higher bond strength with a brittle behavior than the epoxy coated rebar, which presents a ductile behavior.

    DOI

  • Experimental study on the effect of anti-corrosive coatings on bond behavior of corroded rebar

    Mohammad Ridduhan L. Natino, Yizhou Yang, Hikaru Nakamura, Taito Miura

    Construction and Building Materials   274  2021.03  [Refereed]

     View Summary

    This research presents the investigation of the effect of anti-corrosive coatings on the bond behavior of corroded rebar to concrete. Cementitious and epoxy types of anti-corrosive coating materials have been considered and applied manually to rebar as the actual on-site repair procedure of corrosion-induced damaged reinforced concrete (RC) structure. Test specimens prepared were served to investigate the direct effect of coating materials and their combined effects with corrosion. Accelerated electric corrosion test was employed with a target degree of corrosion ranging from 5 to 10%. Laser scanning test was conducted to evaluate and quantify the changed on geometrical properties and surface roughness condition of the sound-coated, bare corroded, and corroded-coated rebar specimens. Finally, two end pull-out tests were conducted to measure the bond-slip relationship, ultimate bond strength, bond toughness and bond ductility. As an important finding, the anti-corrosive coating materials had a significant effect on the change of geometrical properties and surface roughness condition of deformed rebar that have a direct effect on bond behavior and mechanism. Cementitious coating compromised the relative rib area of rebar but enhanced its surface roughness, while epoxy coating maintained the relative rib area of rebar but compromised its surface roughness. Consequently, cementitious coated rebars provide the good bond performance regardless of corrosion degree compared to epoxy coated rebars.

    DOI

  • Numerical simulation of bond degradation subjected to corrosion-induced crack by simplified rebar and interface model using RBSM

    Yizhou Yang, Hikaru Nakamura, Yoshihito Yamamoto, Taito Miura

    Construction and Building Materials   247 ( 247 ) 118602 - 118602  2020.06  [Refereed]

    Authorship:Lead author

     View Summary

    The bond degradation subjected to corrosion-induced crack was investigated numerically using 3D Rigid Body Spring Model (RBSM) in which rebar was modeled by solid elements without modeling explicitly the details of rebar ribs. The proposed numerical model considers both corrosion expansion and shear stress transfer behavior through the interface elements. Validation of proposed model showed that it is possible to obtain reasonable bond performance of non-corroded specimen as meso-scale models. By comparison with experimental results, the proposed model was verified to reproduce the bond deterioration considering corrosion-induced crack with different concrete cover thickness. Moreover, bond deterioration mechanism subjected to corrosion-induced crack was clarified through the crack development and stress distribution of concrete and was found to be the combined effects of degradation of the compressive stress in diagonal compression struts and ring-tension around rebar. Bond deterioration of specimen with larger concrete cover is more sensitive to formation of corrosion crack.

    DOI CiNii

  • Influence of anti-corrosive coatings on bond behavior of corroded rebar

    Mohammad Ridduhan Natino, Yizhou Yang, Hikaru Nakamura, Taito Miura

    Proceedings of the fib Symposium 2020: Concrete Structures for Resilient Society     2205 - 2213  2020  [Refereed]

    Authorship:Lead author

     View Summary

    This research aims to investigate the influence of anti-corrosive coating on the bond behavior of coated corroded rebar to concrete. Two different types of anti-corrosive coating materials have been considered and each is to be applied manually. The test specimens are divided into six groups. Group I contains sound or non-corroded rebar serve as control group, Group II and III are the coated sound rebar groups serve to investigate the direct effect of coating, while Group IV is the bare corroded rebar group, and the Group V and VI are the coated corroded rebar groups. The accelerated electric corrosion method is employed for the Group IV-VI with a varying target degree of corrosion ranging from 5% to 10%. After the target corrosion degree is achieved, laser scanning test is conducted to investigate the change in geometrical properties of the sound/coated and the coated corroded rebar groups. Thereafter, Group I-III are casted and Group IV-VI are re-casted into new specimens and bond-slip relationships are measured through two-end pull out test. As important findings, the anti-corrosive coating materials have a significant influence on the bond behavior. Cementitious coated exhibits a brittle bond-slip behavior and shows a better performance as compared to epoxy coated with a ductile bond-slip behavior.

  • Effect of corrosion-induced crack and corroded rebar shape on bond behavior

    Yizhou Yang, Hikaru Nakamura, Taito Miura, Yoshihito Yamamoto

    Structural Concrete   20 ( 6 ) 2171 - 2182  2019.12  [Refereed]

    Authorship:Lead author

     View Summary

    This paper aims to investigate the individual effect of corrosion-induced crack, corroded rebar shape, and rust around rebar on the bond properties of reinforced concrete (RC) members. First, test specimens were corroded by accelerated electric corrosion method with varying corrosion degree ranging from 0 to 25%. Test specimens were divided into different groups. For the normal corrosion group, bond test was conducted directly after the corrosion test to investigate the combined effects including corrosion-induced crack, corroded rebar shape, and rust on bond deterioration. In another group, after corroded rebar was taken out from test specimen, rust was removed before casted into new concrete to evaluate single effect of corroded rebar shape. Similarly, corroded rebar with rust was casted into new concrete to evaluate the effect of the formation of rust on bond degradation. Experimental results quantitatively illustrate the influential factors including corrosion degree, corrosion crack width and geometry of corroded rebar. As the important finding, corrosion crack in concrete is concluded to be a more dominant factor than the corroded rebar shape and rust accumulation in bond deterioration mechanism. Moreover, rust accumulation contributes to the improvement of bond deterioration induced by corroded rebar shape.

    DOI

  • Simulation of degradation of bond stress and slip relationship with corrosion induced crack

    Hikaru Nakamura, Yizhou Yang, Yoshihito Yamamoto, Taito Miura

    Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures     706 - 713  2019  [Refereed]

    Authorship:Lead author

     View Summary

    The bond degradation and the degradation mechanism induced by corrosion-induced crack were investigated numerically using 3D RBSM. The numerical method that considered both corrosion expansion and shear stress transfer behavior from rebar by interface elements was developed. Validation of the proposed model showed the reasonable results of the bond performance of non-corroded specimen and the bond degradation due to rebar corrosion. Moreover, the bond degradation mechanism was investigated through the crack development and stress distribution for different rebar positions. It was found that the bond degradation is related to reduction of surrounding concrete constraint of rebar due to corrosion-induced crack and the degraded bond strength can be evaluated by the surface crack width of corrosion-induced crack.

  • Effect of corrosion-induced crack and corroded rebar profile on bond stress and slip relationship

       2018.07  [Refereed]

    Authorship:Lead author

  • Numerical capacity examination of RC beams subjected to partial rebar corrosion

    Yizhou Yang, Lukuan Qi

    Key Engineering Materials   707   60 - 71  2016  [Refereed]

    Authorship:Lead author

     View Summary

    Steel Corrosion affects severely on the life and durability of RC structures. In order to investigate the relationship between partial corrosion of RC beams and its cracking morphology and flexural capacity, based on experimental data, RC partial corrosion beam models are simulated using finite element software to model the flexural cracks and capacity of corroded RC beam under different corrosion rates. The results of compared analysis with experiment are presented: with the increase of the corrosion rate, the cracking region is almost consistent, the number of cracks reduces gradually, crack spacing becomes more unequal, bending stiffness and yield strength greatly reduce, ultimate flexural capacity and energy absorption capacity deteriorates, numerical simulation results are in good agreement with experiment.

    DOI

  • Historical analysis and current status study on Chinese construction participants views from A case study

    Huirong Zhang, Yizhou Yang

    Journal of Applied Sciences   13 ( 22 ) 5180 - 5185  2013  [Refereed]

     View Summary

    After the reformation of China, Chinese construction industry has an accelerated improvement. However, what should pay attention is that illegal operations still frequently happen, and quality and safety accidents are main problems the contractors have to face. As a consequence, it is very important to pay attention to a lot of factors such as technology, skills of the labors and so on. While in this paper, the improvement of the duties and obligations of project participants were raised. Since the participants of construction projects play important roles in the successful achievement of project objectives, the research on this field has important values. This paper concludes the development of Chinese construction industry and construction project management after the foundation of the P.R China. With a typical case study, this paper propose a comprehensive understanding of current status and features of Chinese typical construction project organizational structure and its main problems that influence the smooth and successful of project progress. By studying the duties and responsibilities of project participants, this paper gives 6 key aspects for construction project management improvement. © 2013 Asian Network for Scientific Information.

    DOI

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Misc

  • [CS7-07] 構造模型を用いた インタラクティブラーニング 向上の取り組みその2

    花木 冬芽, 楊, 一舟, 王 海龍, 高柳 雅樹

    土木学会全国大会第76回年次学術講演会    2021.09

  • Numerical investigation of effect of corrosion-induced crack on bond-slip relationship

    Yang Yizhou, Nakamura Hikaru, Yamamoto Yoshihito, Miura Taito

    Journal of Structural Engineering, A   65   589 - 599  2019  [Refereed]

    Authorship:Lead author

     View Summary

    <p>The bond degradation and degradation mechanism induced by corrosion-induced crack were investigated numerically using 3D RBSM in which rebar was modeled by solid elements without modeling explicitly the details of rebar ribs. The proposed method considers both corrosion expansion and shear stress transfer behavior from rebar by interface elements. Validation of the proposed model showed that it is possible to obtain reasonable bond performance of non-corroded specimen as mesoscale models and is capable of reproducing the bond deterioration caused by corrosion-induced crack. Finally, bond deterioration mechanism was investigated through the crack development and stress distribution, and the mechanism was found to be the combined effects of degradation of ring-tension stress around cracks and compressive stress near concrete cover, which induced by corrosion-induced crack.</p>

    DOI CiNii

Awards

  • 令和2年度土木学会年次学術講演会 優秀論文賞

    2020   土木学会  

  • 第40回コンクリート工学講演会 年次論文奨励賞

    2018   日本コンクリート工学会  

Presentations

  • Investigation on structural behavior of existing prestressed post-tensioned concrete bridge superstructure

    Presentation date: 2020.09

  • Numerical investigation of effect of corrosion-induced crack on bond-slip relationship

    Presentation date: 2019.04

  • Effect of corrosion-induced crack and corroded rebar shape on bond behavior

    The International Federation for Structural Concrete 5th International fib Congress 

    Presentation date: 2018.10

  • Effect of corrosion-induced crack and corroded rebar profile on bond stress and slip relationship

    Presentation date: 2018.07

  • Numerical and experimental evaluation of bond-slip relationship of corroded rebar with different concrete cover thickness

    Presentation date: 2017.09

  • Numerical capacity examination of RC beams subjected to partial rebar corrosion

    Yizhou Yang

    International Conference on Mining, Material and Metallurgical Engineering 

    Presentation date: 2016.04

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Syllabus

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Teaching Experience

  • Science and Engineering Laboratory

    2020.04
    -
    Now
     

  • SHIP Research Planning and Skill B

    Waseda University  

    2020.04
    -
    Now
     

  • SHIP Research Planning and Skill A

    Waseda University  

    2020.04
    -
    Now
     

  • SHIP Collaborative Workshop

    Waseda University  

    2020.04
    -
    Now
     

  • Laboratory work on structures

    Waseda University  

    2020.04
    -
    Now
     

  • Bridge Engineering

    Waseda University  

    2020.04
    -
    Now
     

  • Materials and Structures B

    Waseda University  

    2020.04
    -
    Now
     

  • Materials and Structures A

    Waseda University  

    2020.04
    -
    Now
     

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