Tomiyama Jun

写真a

Researcher Number(JSPS Kakenhi)

20325830
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Current Affiliation Organization 【 display / non-display 】

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Material,Structural and Energy Engineering   Professor  

  • Concurrently   University of the Ryukyus   Faculty of Engineering   School of Engineering_Civil Engineering Program   Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Engineering and Science   Civil Engineering   Professor  

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Academic degree 【 display / non-display 】

  • University of the Ryukyus -  Doctor of Engineering

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External Career 【 display / non-display 】

  • 2006.04
    -
    2020.03

    University of the Ryukyus, Faculty of Engineering, Asosiate Professor  

  • 2020.04
    　
    　

     

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Affiliated academic organizations 【 display / non-display 】

  • 1900.04
    -
    Now
     

    Architectural Institute of Japan 

  • 1900.04
    -
    Now
     

    Japan Concrete Institute 

  • 1900.04
    -
    Now
     

    Japan Society of Civil Engineers 

  • 2005.04
    -
    Now
     

    Japan Society for Computaitonal Engineering and Science 

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Research Interests 【 display / non-display 】

  • Material Eng.,Computational Mechanics,Concrete Engineering

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Research Areas 【 display / non-display 】

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

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Research Theme 【 display / non-display 】

  • Diffusion Analysis of Air Born Sea-Salt

  • Analytical Study on Early Aged Concrete

  • Study on Alkali Silica Reaction

  • Flow Analysis of Fresh Concrete

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Published Papers 【 display / non-display 】

  • Verification of Expansion Inhibition Effect of Lithium Nitrite on Concrete Deteriorated by Delayed Expansion ASR

    Concrete Structure Scenarios, JSMS,   23   467 - 472   2023.10 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Mechanical properties of shotcrete with addition of sugarcane bagasse fiber and ash

    Bruno Ribeiro · Yuta Yamashiro · Katsuaki Goto · Jun Tomiyama · Takashi Yamamoto· Yosuke Yamashiki

    Journal of Material Cycles and Waste Management     2023.05 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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  • Numerical study on the temporal changes of the principal stresses at the ends of the hollow PC-girders to control horizontal end cracks

    Abdul Khaliq Karimi, Ryota Uchida, Bashir Ahmad Aasim, Jun Tomiyama, Yuya Suda

    INDIAN JOURNAL OF SCIENCE AND TECHNOLOGY   14 ( 16 ) 1283 - 1295   2021.07 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Salt damage simulation on each part and member of concrete bridge superstructure

    J. Tomiyama, Y. Suda, T. Yamaguchi, Y. Kato, K. Arai

    Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations ( CRC Press )    2021.04 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    Chloride attack is a major deterioration factor for concrete bridges in Japan. Especially, Okinawa in Japan is a region where salt attack is severe. And also, it is known that the deterioration rate caused by airborne salt attack is different from each part and member of concrete bridges. Therefore, in order to properly evaluate the life cycle cost (LCC) of concrete bridges, it is necessary to decide the appropriate repair timing in consideration of the degree of deterioration of parts and members of bridges. In this paper, a simulation method which can evaluate the deterioration of salt damage for each part and member of concrete bridge superstructures is proposed. The proposed method, which has been adopted Random Walk method as an airborne salt simulation method, enables to consider the amount of adhesion of airborne chloride ion on surface of each part and member of concrete bridge superstructures. To evaluate the accuracy of the method, a concrete bridge superstructure which was deteriorated by airborne salt in Okinawa is focused on and simulated. From the evaluation result, it is found that the simulation results were in good agreement with investigation results. Moreover, it is shown that the possibility of prediction of the occurrence timing of deterioration on each part and member of concrete bridge superstructures by using the method.

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  • On-site stress measurement for steel reinforcement using a portable X-ray diffraction system

    Y. Oshima, T. Noda, T. Furuta, J. Tomiyama, Y. Suda, O. Aydan, T. Makino, T. Miyagi, N. Kurokawa, K. Tanaka, M. Yamaguchi

    Proceedings of the Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020), June 28-July 2, 2020, Sapporo, Japan ( CRC Press )    2021.04 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    In this paper, we report on the on-site stress measurement of steel reinforcement (rebar) using portable X-ray diffraction system for concrete structures. First, we carried out the fundamental fulling test on rebars and confirmed that the X-ray system exhibits almost identical values of applied load for rebars. Then, the residual strain was also identified regarding the rebars which was loaded over its yielding stress. The stress of rebars embedded in concrete girders is finally evaluated by the system. Consequently, it is found that the system could assess the absolute values of stress rebars with some accuracy.

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Other Papers 【 display / non-display 】

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Presentations 【 display / non-display 】

  • Numerical Study on Adhered Airborne Salt Content to The Superstructure of Concrete Bridge

    Jun Tomiyama

    8th International Symposium between Japan, Korea and China- Performance Improvement of Concrete for Long life span Structure  2014.03  -  2014.03 

  • Study on Trigate for Deteriorated Concrete Structures by JSCE-342

    S.Miyazato, T.Yamamoto, J.Tomiyama, R.Takahasi, T.Watanabe

    Proceedings of the 1st Ageing of Materials ＆ Structures  2014  -  2014 

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Preferred joint research theme 【 display / non-display 】

  • Durability on concrete structures

  • Study on Alkali Silica Reaction

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SDGs 【 display / non-display 】

  • 人と環境に優しく長持ちする材料開発
    産業廃棄物の再資源化

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