PREDICTION OF STRENGTH DEVELOPMENT IN CONCRETE STRUCTURES

Early removal of side forms from concrete members may cause mechanical damage or lead to frost damage. Currently, achievement of a cube compressive strength of 5 N/sq mm is the criterion for avoiding such damage, but recent research indicates that the value may be reduced to 2 N/sq mm. Soffit forms may be removed when members have sufficient flexural strength to withstand self-weight of the concrete and other applied loads. In addition, deflections must not be excessive. Research has shown that the proportion of design load applied at early age should not exceed the proportion of design compressive strength achieved at the age in the member under consideration. The relationships between compressive strength and two parameters, maturity equivalent and equivalent age, are discussed. Equivalent age is shown to be useful for the prediction of strength from a known temperature history at early age when the compressive strength development is very sensitive to curing temperature. At later ages, maturity equivalent may be more suitable for prediction purposes. A method of prediction of temperature history in hydrating concrete members has been combined with these methods of prediction of compressive strength to determine the times at which formwork may be removed, based on the criteria described.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1975/558/558-003.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=PREDICTION+OF+STRENGTH+DEVELOPMENT+IN+CONCRETE+STRUCTURES&author=B.+Sadgrove&publication_year=1975
• Availability:
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• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Mechanical Properties of Concrete.Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Sadgrove, B M
• Conference:
  • 54th Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia
  • Date: 1975-1-13 to 1975-1-17
• Publication Date: 1975

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 19-28
• Monograph Title: Recent developments in accelerated testing and maturity of concrete
• Serial:
  • Transportation Research Record
  • Issue Number: 558
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Age; Compressive strength; Concrete curing; Concrete structures; Deflection; Design load; Flexural strength; Forecasting; Formwork; Strength of materials; Temperature
• Uncontrolled Terms: Maturity; Removal; Strength development
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00131689
• Record Type: Publication
• ISBN: 0309024668
• Files: TRIS, TRB
• Created Date: Jun 5 1976 12:00AM