COMPARATIVE STUDY OF SEVERAL CONCRETES REGARDING THEIR POTENTIALS FOR CONTRIBUTING TO PRESTRESS LOSSES

THE RESULTS OF AN EXPERIMENT CONDUCTED TO COMPARE THE CONCRETES PRODUCED AT THE SEVEN MANUFACTURERS OF PRESTRESSED CONCRETE IN PENNSYLVANIA WITH REGARD TO THEIR POTENTIAL IN CONTRIBUTING TO PRESTRESS LOSSES ARE PRESENTED. THIS EXPERIMENT IS THE PRELIMINARY PHASE OF A RESEARCH PROJECT FOR THE ESTABLISHMENT OF A RATIONAL METHOD TO EVALUATE LOSSES IN PRETENSIONED CONCRETE STRUCTURAL MEMBERS. SMALL CONCRETE SPECIMENS WERE MADE AT EACH OF THE PRODUCERS OF PRESTRESSED CONCRETE IN PENNSYLVANIA. ELASTIC SHORTENING AND CREEP STRAINS WERE MEASURED FOR AN INITIAL PRESTRESS OF 2000 PSI. SHRINKAGE STRAINS WERE ALSO MEASURED FROM SPECIMENS OF IDENTICAL DIMENSIONS. THE TWO MANUFACTURERS WHOSE PRODUCTS EXHIBITED THE LARGEST AND THE SMALLEST ELASTIC SHORTENING, CREEP, AND SHRINKAGE WERE IDENTIFIED. THIS REPORT ALSO REVIEWS PREVIOUS RESEARCH ON THE SUBJECT OF CREEP AND SHRINKAGE, AND PRESENTS SEVERAL KNOWN THEORIES CONCERNING THESE PHENOMENA. THE DATA FROM THIS EXPERIMENT WAS ALSO USED TO TEST SEVERAL CREEP AND SHRINKAGE FORMULAE CURRENTLY ACCEPTED. /AUTHOR/

• Supplemental Notes:
  • Report No. 339.1, PP 1-84, 19 FIG, 4 TAB, 22 REF, 1 APP
• Corporate Authors:

  Lehigh University

  Bethlehem, PA  United States  18015
• Authors:
  • Rokhsar, A
  • Huang, T
• Publication Date: 1968-5

Subject/Index Terms

• TRT Terms: Alternatives analysis; Concrete; Creep; Elasticity (Mechanics); Formulas; Industrial plants; Losses; Prestressed concrete; Prestressing; Reviews; Shrinkage; Specimens; Strain (Mechanics); Structural members; Theory
• Uncontrolled Terms: Comparative analysis
• Old TRIS Terms: Concrete creep; Strains
• Subject Areas: Bridges and other structures; Highways; Materials;

Filing Info

• Accession Number: 00208819
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 4 1994 12:00AM