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SIZE EFFECT IN STRENGTH OF CONCRETE STRUCTURES AND PROPERTIES OF FRACTURE PROCESS ZONE

Research Project

Project/Area Number 06650501
Research Category

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

Allocation TypeSingle-year Grants
Research Field 土木材料・力学一般
Research InstitutionTOHOKU GAKUIN UNIVERSITY

Principal Investigator

OTSUKA Koji  TOHOKU GAKUIN UNIVERSITY Faculty of Engineering, Department of Civil Engineering, Professor, 工学部, 教授 (10048803)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsX-ray technique using contrast medium / Fracture process zone / Fracture energy / size effect
Research Abstract

(1) Size effect :
Compact tension specimens of three different sizes, 175x175x80 (S type), 350x350x80 (M type), 700x700x80 (L type), were prepared to examine the effect of specimen size on the tensile strength of concrete. It was observed that the strength of the larger size specimen decrease compared to that of the smaller size specimen. When the specimen size increased by 4 times the strength of the concrete decreased by 12 to 16 %.
(2) Properties of the fracture process zone :
Fine cracks forming from the tip of the notch were detected by X-ray technique using contrast medium. The rate of increase in the maximum length of the fracture process zone was larger than the ratio representing increase in the specimen size ratio. The maximum width of the fracture process zone increased at a very slow rate compared to the increase in the specimen size ratio.
Fracture process zone was also detected by AE three dimensional positioning method. The area of fracture process zone which was detected by AE method was larger than that detected by the x-ray method.
(3) Fracture energy :
At the maximum load, the fracture energy which was calculated from the area under load -C.O.D curve divided by the area and volume of fracture process zone was almost constant in spite of the differences of specimen size.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] OTSUKA,Koji: "INFLUENCE OF AGGREGATE SIZE ON BEHAVIOR OF FRACTURE PROCESS ZONE OF CONCRETE" Concrete Library of JSCE. No.24. 111-125 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] MATSUZAKA,Keita: "Effect of specimen size on behavior of fracture process zone of concrete" Abstracts of the Annual Scientific Presentation Meeting of JSCE. 638-639 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] EBINA,Masaru: "Studies on effect of specimen size"

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 須藤泰孝: "曲げを受けるコンクリート梁内の微視的破壊のAE3次元位置評定" 土木学会第50回年次学術講演会講演概要集第5部. 662-663 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 須藤泰孝: "AEを用いたコンクリートの破壊進行領域の性状に関する研究" 土木学会東北支部技術研究発表会講演概要. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 今野洋一: "コンクリートの引張破壊の進行速度に関する研究" 土木学会東北支部技術研究発表会講演概要. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Koji OTSUKA: "INFLUENCE OF AGGREGATE SIZE ON BEHAVIOR OF FRACTURE PROCESS ZONE IN CONCRETE" CONCRETE LIBRARY OF JSCE. 24. 111-125 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 松坂恵太: "コンクリートの破壊進行領域の性状に及ぼす部材寸法の影響について" 土木学会第49回年次学術講演会講演概要集第5部. 638-639 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 海老名勝: "コンクリートの破壊進行領域の性状に及ぼす部材寸法の影響に関する研究" 土木学会東北支部技術研究発表会講演概要. 574-575 (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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