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

Control of cracking caused by autogenous shrinkage in mass concrete

Research Project

Project/Area Number 07650531
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 InstitutionASHIKAGA INSTITUTE OF TECHNOLOGY

Principal Investigator

MIYAZAWA Shingo  Ashikaga Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10157638)

Co-Investigator(Kenkyū-buntansha) TAZAWA Ei-ichi  Hiroshima University, Faculty of Engineering, Professor, 工学部, 教授 (60155067)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsConcrete / High- strength concrete / Mass concrete / Autogenous shrinkage / Crack / Thermal stress / 収縮
Research Abstract

Influences of cement type, mix proportion, temperature and specimen size on autogenous shrinkage of concrete were investigated. Influence of autogenous shrinkage on cracking of mass concrete was also investigated with restraining tests where temperature and stress histories of specimens were controlled. Main results of this research are as follows.
(1) Influence of cement type on autogenous shrinkage can be setimated with mineral compositon and degree of hydration. Autogenous shrinkage increases by using blast furnace slag with 6000-8000 cm^2/g Blaine Fineness.
(2) Predicting model for autogenous shrinkage strain of concrete was proposed. It is function of cement and admixture type, water-binder ratio and effective age. The proposed model is effective for concretes with ordinary Portland cement and with water-binder ratio between 0.2 and 0.56.
(3) The rate of autogenous shrinkage increases with temperature of concrete within the range from 20 to 60 ゚C.It is proved that this effect can be estimated with maturity concept. Autogenous shrinkage during the first 24 hours is lager for a specimen with lager dimensions.
(4) Contribution of autogenous shrinkage to restrained stress is increased with decrease in water-cement ratio. For silica fume concrete with water-cement ratio of 0.20, tensile stress generates even when temperature is still increasing. This is because autogenous shrinkage overcomes expansion due to temperature rise.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 宮澤 伸吾: "セメント系材料の自己収縮に及ぼすセメントの化学組成の影響" コンクリート工学年次論文報告集. 18-1. 699-704 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 宮澤 伸吾: "高強度コンクリートの自己収縮に及ぼす供試体寸法の影響" セメント・コンクリート論文集. 50. 472-477 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 田澤 栄一: "コンクリートの自己収縮ひずみの予測法に関する研究" 土木学会論文集. 571. 211-219 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ei-ich Tazawa: "Influence of autogenous shrinkage on cracking in high-strength Concrete" 4th International Symposium on Utilization of High-strength/High-gerformance Concrete. 2. 321-330 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shingo Miyazawa: "Influence of cement composition on autogenous shrinkage of cementitious materials" Proceedings of the Japan Concrete Institute. Vo.18, No.1. 699-704 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shingo Miyazawa: "Influence of specimen size on autogenous shrinkage of high-strength concrete" JCA Proceedings of Cement & Concrete. No.50. 472-277 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ei-ichi Tazawa: "Influence of autogenous shrinkage on cracking in high-strength concrete" 4th International Symposium on Utilization of High-strength High-performance Concrete. Vol.2. 321-330 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ei-ichi Tazawa: "Estimation of autogenous shrinkage of concrete" Journal of Materials, Concrete Structures and Pavements. No.571. 211-219 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 宮澤伸吾: "セメント系材料の自己収縮に及ぼすセメントの化学組成の影響" コンクリート工学年次論文報告集. Vol.18,No.1. 699-704 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 宮澤伸吾: "高強度コンクリートの自己収縮に及ぼす供試体寸法の影響" セメント・コンクリート論文集. No.50. 472-477 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 宮澤伸吾: "超高強度コンクリートの若材齢におけるクリープ係数" 土木学会第51回年次学術講演会. 578-579 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] E.Tazawa: "Influence of cement composition on autogenons shrinkage of Comcrete" Proceedings of 10th Int.Cong.on the Chemistry of Cement. (発表予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] E.Tazawa: "Influence of autogenous shrinkage on craeking in high-strength concrete" Proceedings of 4th Int.Symp.on Utilization of High-strength/High-performance Concrete. 321-330 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 宮澤伸吾: "高強度コンクリートの自己収縮に関する実験的研究" 第24回関東支部技術研究発表会講演概要集,土木学会. (発表予定). (1996)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1995-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi