CLASSIFYING REINFORCING BARS FOR BOND STRENGTH

TESTS RESULTS ARE PRESENTED OF SPECIMENTS OF NINE TYPES OF REINFORCING BARS. A SIMPLE TEST METHOD WAS NEEDED THAT COULD BE USED TO COMPARE AND CLASSIFY THE DIFFERENT TYPES OF DEFORMED BAR REINFORCEMENT CURRENTLY USED FOR BOND STRENGTH. IT WAS FOUND THAT THE TESTS FELL INTO TWO GROUPS: PULL-OUT TYPE AND TRANSFER TYPE; THE FORMER REFLECTING INTERFERENCE OR ANCHORAGE BOND AND THE LATTER TRUE ADHESION BOND. ADHESION BOND DIFFERED LITTLE FOR THE WIDE RANGE OF BARS TESTED. BUT ANCHORAGE BOND DIFFERED CONSIDERABLY, DEPENDING UPON THE DEGREE OF SURFACE DEFORMATION, WHILE PLAIN ROUND, SQUARE TWISTED AND RIBBED BARS FELL INTO THREE DISTINCT CATEGORIES. IT IS SUGGESTED THAT THE PRESENT COMPARATIVE TEST OF BRITISH STANDARD CODE OF PRACTICE 114:1957 FOR BOND AND ANCHORAGE COULD BE REPLACED BY A SIMPLE NEW TEST WHICH MEASURES THE INTRINSIC PERFORMANCE OF A BAR IN ANCHORAGE. /TRRL/

• Supplemental Notes:
  • CURRENT PAPER 36/70
• Corporate Authors:

  Building Research Establishment

  Bucknalls Lane, Gorston
  Watford WD2 7JR, Hertfordshire,   England 
• Authors:
  • Snowdon, L G
• Publication Date: 1970-11

Language

• English

Media Info

• Features: Figures; Photos; Tables;
• Pagination: 30 p.

Subject/Index Terms

• TRT Terms: Adhesion; Anchorages; Bond strength (Materials); Bonding; Classification; Deformed bars; Material reinforcement; Pull out test
• Old TRIS Terms: Pullout
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216626
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: TRIS
• Created Date: Jul 24 1972 12:00AM