ACCURACY OF ESTIMATING LONG-TERM STRAINS IN CONCRETE

A method developed earlier for estimating long-term creep and shrinkage from short-term measured test data is shown to be satisfactory for predicting ten-year values. For water-stored concrete, swelling at ten years is appreciable, and therefore the method is extended to predict long-term swelling. Using thirty-year strain (extrapolated from experimentally determined ten-year strain), five standard methods of prediction are compared in performance. When applied in their basic form, all methods are unsatisfactory and it is recommended that, depending on the required accuracy, the secant modulus of elasticity be determined and used with the Concrete Society/Cement and Concrete Association method to predict thirty-year strain. For improved accuracy, short-term test data are necessary for use with either the author's method or the Bazant and Panula model II method. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00249831
• Corporate Authors:

  Cement and Concrete Association

  Wexham Spring
  Slough SL3 6PL, Buckinghamshire,   England 
• Authors:
  • BROOKS, J J
• Publication Date: 1984-9

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 131-145
• Serial:
  • MAGAZINE OF CONCRETE RESEARCH
  • Volume: 36
  • Issue Number: 128
  • Publisher: Thomas Telford Limited
  • ISSN: 0024-9831

Subject/Index Terms

• TRT Terms: Accuracy; Concrete; Creep; Deformation; Errors; Forecasting; Handling and storage; Mathematical models; Measurement; Mechanical strain; Methodology; Modulus of elasticity; Shrinkage; Storage facilities; Swelling; Tests; Time duration; Water
• Uncontrolled Terms: Long term; Models
• Old TRIS Terms: Concrete creep; Concrete shrinkage; Strains
• ITRD Terms: 4755: Concrete; 4732: Creep (mater); 5595: Deformation; 6440: Error; 132: Forecast; 9110: Long term; 6136: Measurement; 9102: Method; 5919: Modulus of elasticity; 4743: Shrinkage; 9137: Storage; 6255: Test; 4355: Water
• Subject Areas: Freight Transportation; Highways; Materials; Planning and Forecasting; Terminals and Facilities; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00394620
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 31 1985 12:00AM