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1998 Fiscal Year Final Research Report Summary

Evaluation of Fracture Properties of Various Concretes

Research Project

Project/Area Number 09650508
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY (1998)
Nagoya University (1997)

Principal Investigator

NIWA Junichiro  INSTITUTION,DEPARTMENT,TITLE OF POSITION Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (60164638)

Project Period (FY) 1997 – 1998
KeywordsHigh Strength Concrete / Self-Compacting Concrete / Fracture Mechanics / Fracture Energy / Tension Softening Curve / Fictitious Crack / J Integral / Size Effect
Research Abstract

As the first step of this research work, fracture properties of various concretes, such as high strength concrete, self-compacting high performance concrete, etc. have been evaluated based on the fracture mechanics of concrete. Self-compacting high performance concrete is a very promising new concrete because it does not need the compaction during casting. However, from the viewpoint of the fracture mechanics, it is found that it will provide less fracture energy compared with conventional concrete because the amount of coarse aggregates included in self-compacting high performance concrete is remarkably reduced to provide the sufficient flowability. On the other hand, the fracture energy of high strength concrete shows the same tendency as conventional concrete because the content of coarse aggregates in high strength concrete is not significantly different from conventional concrete.
As the second step, the experimental method to determine the tension softening curve of concrete has been investigated extensively. The tension softening curve is one of the most important parameters for the fracture mechanics of concrete. In this research, the new method to determine the tension softening curve of concrete has been proposed. In this new method, the release of elastic strain energy is taken into account. Moreover, the extension of the fictitious crack can be evaluated accurately based on the measurement for longitudinal strain distribution. Although this new method is quite simple compared with inverse analysis, it can predict the tension softening curve of concrete with reasonable accuracy.
Finally, the size effect of structural concrete using various concretes is numerically predicted based on the obtained fracture properties.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 二羽淳一郎, Somnuk,T.: "高強度コンクリートおよび自己充填コンクリートの破壊力学特性" コンクリート工学年次論文報告集. 19・2. 117-122 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Junichiro Niwa, Somnuk, T.: "Fracture Properties of High Strength and Self-Compacting High performance Concretes" Transactions of the Japan Concrete Institute. 19・1. 73-80 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 二羽淳一郎、 松尾豊史、 他: "コンクリートの引張軟化曲線決定に関する実験的研究" 土木学会論文集. No.606. 75-88 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Niwa, Somnuk, T., 他: "Proposed New Method to Determine Tension Softening Curve of Concrete" 東京工業大学土木工学科研究報告. No.57. 29-37 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 斎藤 稔, 二羽淳一郎: "セメントの構成成分がコンクリートの破壊力学特性値に及ぼす影響" コンクリート工学年次論文報告集. 20・3. 109-114 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 二羽淳一郎、 Taweechai, S., 他: "コンクリートの引張軟化曲線の実験的決定手法" コンクリート工学年次論文報告集. 20・3. 145-150 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Niwa、 Taweechai, S., 他: "New Method to Determine Tension Softening Curve of Concrete" Proceedings of FRAMCOS-3. 3・1. 347-356 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Junichiro Niwa: "Somnuk Tangtermsirikul : Fracture Properties of High Strength and Self-Compacting High Performance Concretes(in Japanese)" Proceedings of the Japan Concrete Institute. Vol.19, No.2. 117-122 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junichiro Niwa: "Somnuk Tangtermsirikul : Fracture Properties of High Strength and Self-Compacting High Performance Concretes" Transactions of the Japan Concrete Institute. Vol.19, No.1. 73-80 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junichiro Niwa: "Taweechai Sumranwanich, Toyofumi Matsuo : Experimental Study to Determine the Tension Softening Curve of Concrete(in Japanese)" Journal of Materials, Concrete Structures and Pavements of JSCE. No.606/V-41. 75-88 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junichiro Niwa: "Taweechai Sumranwanich, Somnuk Tangtermsirikul : Proposed New Method to Determine Tension Softening Curve of Concrete" Technical Report, Department of Civil Engineering, Tokyo Institute of Technology. No.57. 29-37 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Minoru Saito: "Junichiro Niwa : Influence of the Composing Cement Ingredients on the Fracture Properties of Concrete(in Japanese)" Proceedings of the Japan Concrete Institute. Vol.20, No.3. 109-114 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junichiro Niwa: "Taweechai Sumranwanich, Toyofumi Matsuo : Experimental Method to Determine the Tension-Softening Curve of Concrete(in Japanese)" Procedings of the Japan Concrete Institute. Vol.20, No.3. 145-150 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junichiro Niwa: "Taweechai Sumranwanich, Somnuk Tangtermsirikul : New Method to Determine Tension Softening Curve of Concrete" Proeedings of Fracture Mechanics of Concrete Structures(FRAMCOS-3). Vol, 1. 347-356 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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