• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Segregation Resistance of Fresh Concrete

Research Project

Project/Area Number 05452225
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 土木材料・力学一般
Research InstitutionSaitama University

Principal Investigator

MACHIDA Atshuiko  Saitama Univ., Dept.of Eng., Professor, 工学部, 教授 (50008869)

Co-Investigator(Kenkyū-buntansha) IWASHITA Kazuyoshi  Saitama Univ., Dept.of Eng., Asso.Professor, 工学部, 助教授 (40203377)
MUTSUYOSHI Hiroshi  Saitama Univ., Dept.of Eng., Asso.Professor, 工学部, 助教授 (60134334)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordssegregation resistance / slump test / flow test / discreat element method / tension allowance in spring / friction constant / dash-pot constant / spring cpnstant / 材料分離 / 流動解析 / スランプ
Research Abstract

Two kinds of flow test and slump test were carried out on six kinds of concrete, and these results were analyzed by using the discrete element method which was established last year. The followings were made clear from the tests and analysis.
(1) The test results confirmed that slump flow value and flow time are independent from each other, that is, the former relates to deformation potential, whereas the latter to defor-mation velocity.
(2) It was shown that the discrete element method can be applied to analysis of behavior of fresh concrete, if tension allowance in spring to express viscosity of mortar, friction constant between elements to express irregularities of surfaces of coarse aggregates and, if necessary, friction constant between elements and bottom surface are introduced as well as spring constant and dash-potconstant which are used in analysis of soils and if these constants can be assumed properly.
(3) It was shown that tension allowance in spring plays dominant role in analysis both of slump test and flow tests. This fact corresponds to the fact that viscosity of mortar relates to both of deformation potential and deformation velocity.
(4) It was shown that friction constant between elements linearly related to slump flow value and that flow time does not change if the constant changes within some range but it increases linearly if the constat increases outside the range. It can be said from this fact that interaction of coarse aggregate can be expressed precisely if the friction constant is determined properly.
(5) It was shown that the behavior of fresh concrete which has same deformation potential but different deformation velocity can be expressed, if dash-pot constant is selected properly.
Segregation resistance of fresh concrete can hardly be made clear by experiments but, as described above, it was shown that the discrete element method has a possibility to make it clear, if the accuracy is improved.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 鍋田克己: "特殊混和剤を用いたフレッシュコンクリートの流動性状の解明" 土木学会第47回年次学術講演概要集. V-47. 574-575 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 鍋田克己: "個別要素法を用いたフレッシュコンクリートの流動シミュレーションに関する研究" 土木学会第48回年次学術講演概要集. V-48. 198-199 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 鍋田克己: "個別要素法を用いたフレッシュコンクリートの流動シミュレーション" コンクリート工学年次論文報告集. 16巻. 479-484 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nabeta,Katsumi: "Flow Simulation of Fresh Concrete by Distinct Element Methcd" Proceedings of JCI. (in printing).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nabeta, T., Machida, A.: "Flow Characteristics of Fresh Concrete with Anti-Washout Agent (in Japanese)" 47th Annual Meeting of JSCE. 47-V. 574-575 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nabeta, T., Iwashita, T., & Machida, A.: "Flow Simulation of Fresh Concrete by Distinct Element Method (in Japanese)" 48th Annual Meeting of JSCE. 48-V. 198-199 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nabeta, T., Iwashita, T., & Machida, A.: "Flow Simulation of Fresh Concrete by Distinct Element Method (in Japanese)" Preceedings of JCI. Vol.16. 479-484 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Nabeta, T., Iwashita, T., & Machida, A.: "Flow Simulation of Fresh Concrete by Distinct Element Method" Transactions of JCI. (in Printing).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 鍋田克己: "特殊混和材を用いたフレッシュコンクリートの流動性状の解明" 土木学会第47回年次学術講演概要集. V-47. 574-575 (1992)

    • Related Report
      1994 Annual Research Report
  • [Publications] 鍋田克己: "個別要素法を用いたフレッシュコンクリートの流動シミュレーションに関する研究" 土木学会第48回年次学術講演概要集. V-48. 198-199 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 鍋田克己: "個別要素法を用いたフレッシュコンクリートの流動シミュレーション" コンクリート工学年次論文報告集. 16巻. 479-484 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Nabeta,Katsumi: "FlowSimulation of Fresh Concrete by Distinct Element Method" Proceedings of JCI. (in printing).

    • Related Report
      1994 Annual Research Report
  • [Publications] 鍋田克己: "個別要素法によるフレッシュコンクリートの流動シミュレーション" コンクリート工学年次論文報告集. 16(発表予定). (1994)

    • Related Report
      1993 Annual Research Report

URL: 

Published: 1993-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi