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1990 Fiscal Year Final Research Report Summary

Rational Constitutive Laws to Describe Creep and Shrinkage of Concrete at Elevated Temperatures

Research Project

Project/Area Number 01550436
Research Category

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

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionTohoku University

Principal Investigator

MIHASHI Hirozo  Tohoku Univ., Faculty of Eng., Assoc. Prof., 工学部, 助教授 (90091751)

Co-Investigator(Kenkyū-buntansha) NARITA Takeshi  Tohoku Univ., Faculty of Eng., Research Associate., 工学部, 助手 (00155996)
NUMAO Tatsuya  Ibaraki Univ., Faculty of Eng., Research Associate., 工学部, 助手 (90164649)
Project Period (FY) 1989 – 1990
KeywordsShrinkage / Moisture Migration / Creep / Atmospheric Temperature / double power law / Thin Wall Cylinder Specimen / Moisture Content / Hygral Gradient
Research Abstract

Since the late of 1950's, the development of prestressed concrete nuclear reactor containment vessels has demanded the knowledge of mechanical behavior of concrete at high temperatures. Mathematical models for creep and shrinkage of concrete at temperatures over. 100^゚C have been asked particularly for finite element analysis of the safety in nuclear reactor structures. For this purpose, numerous experimental studied have been tried and various mathematical models have been proposed as the constitutive laws for the finite element analysis. Most of them, however, have failed to simulate the experimental results. The influence of moisture content and movement on the mechanical properties such as Young's modulus, shrinkage and creep behavior is significant even under 100^゚C as well as over 100^゚C. Therefore, it is very important to study the moisture migration in concrete for understanding the mechanical properties of concrete at elevated temperatures.
In this project, the following result … More s are obtained:
(1). Cylindrical specimens of mortar and concrete were tested under several temperature atmosphere to study the moisture migration process and changes of mechanical properties such as modulus of elasticity, compressive strength, tensile strength and so on. Moreover, these results of moisture migration were analyzed by a finite element method as a nonlinear diffusion process and the obtained material parameters were discussed.
(2). By means of thin wall cylinder specimens, the moisture migration process and shrinkage of hardened cement paste at elevated temperatures were studied. It was shown that the the relationship between shrinkage and water loss had some changing points and this tendency became more clear as the temperature increased.
(3). Coefficients of the double power law for creep of concrete are influenced by the moisture content in the concrete. In order to develop a generic constitutive law to describe rationally the creep of concrete, these coefficients should be given as functions of the moisture content. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 三橋 博三、沼尾 達弥: "硬化セメントペ-ストの薄肉円筒供試体を用いた乾燥収縮に関する基礎的研究" セメント・コンクリ-ト論文集. 43. 232-237 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三橋 博三、沼尾 達弥: "高温下のコンクリ-トの水分逸散過程に及ぼす前養生条件の影響" コンクリ-ト工学年次論文報告集. 11ー1. 229-234 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 沼尾 達弥、三橋 博三、平井 和喜: "コンクリ-ト中の微細構造と水分移動及び乾燥収縮のメカニズム" 東北大学建築学報. 29. 47-56 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Mihashi and T.Numano: "Moisture Diffusion Process and Shrinkage of Concrete at Elevated Temperatures" Wissenschaftliche Zeitschrift der Hochschule for Architektur und Bauwesen Weimar. 36. 9-15 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 沼尾 達弥、三橋 博三: "薄肉円筒供試体を用いたセメント硬化体の乾燥収縮と水分逸散に関する研究" セメントコンクリ-ト論文集. 44. 524-529 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Numano and H.Mihashi: "Moisture Migration and Shrinkage of Hardened Cement Paste at Elevated Temperatures" Transactions of 11th Int.Conf.on Structural Mechanics in Reactor Technology. H. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Mihashi and T. Numao: "Fundamental Studies on Shrinkage of Hardened Cement Paste with a Thin-Wall Cylindrical Specimen" CAJ Proc. of Cement & Concrete. No. 43. 232-237 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Mihashi and T. Numao: "Influence of Curing Condition of Diffusion Process of Concrete at Elevated Temperatures" Proc. of the Japan Concrete Institute. Vol. 11, No. 1. 229-234 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Numao, H. Mihashi and K. Hirai: "Structure of Concrete and Mechanisms of Water Diffusion and Shrinkage" The Architectural Reports of the Tohoku University. No. 29. 47-56 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Mihashi and T. Numao: "Moisture Diffusion Process and Shrinkage of Concrete at Elevated Temperatures" Wissenschaftliche Zeitschrift der Hochschule fur Architektur und Bauwesen Weimar. 36. 9-15 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Numao and H. Mihashi: "Shrinkage and Water Loss of Hardened Cement Paste and Mortar with Thin-Wall Cylinders" CAJ Proc. of Cement & Concrete. No. 44. 524-529 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Numao and H. Mihashi: "Moisture Migration and Shrinkage of Hardened Cement Paste at Elevated Temperatures" Trans. of 11th Int. Conf. on Structural Mechanics in Reactor Technology,. vol. H. (1991)

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

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Published: 1993-08-12  

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