EFFECT OF RUST AND SCALE ON THE BOND CHARACTERISTICS OF DEFORMED REINFORCING BARS
AN EXPERIMENTAL PROGRAM WAS ESTABLISHED TO PROVIDE NEEDED INFORMATION ON BOND CHARACTERISTICS OF ASTM A432 BARS WITH A BROAD RANGE OF SCALE AND RUST CONDITIONS. THE PRINCIPLE PARAMETER IN THE TEST SERIES WAS THE BAR SURFACE CONDITIONS. IT WAS CONCLUDED THAT THE BOND CHARACTERISTICS OF DEFORMED REINFORCING BARS WITH DEFORMATIONS MEETING ASTM A 305 SPECIFICATIONS DO NOT APPEAR TO BE ADVERSELY AFFECTED BY VARYING DEGREES OR TYPES OF SURFACE RUST OR ORDINARY MILL SCALE PROVIDED THE WEIGHT OF THE BAR MEETS THE MINIMUM ASTM WEIGHT AND DEFORMATION HEIGHT REQUIREMENTS. THE DEFORMATION DIMENSIONS APPEAR TO GOVERN BOND CHARACTERISTICS OF RUSTY BARS, IN THAT THESE BARS EXHIBIT A BEHAVIOR SIMILAR TO COMPANION AS ROLLED BARS. THE TEST DATA INDICATE THAT THE CURRENT BOND REQUIREMENTS ARE QUITE CONSERVATIVE, ESPECIALLY WITH REGARD TO SMALLER BARS BECAUSE OF THE 800 PSI (NOM. 60 KGF/CM SQUARED) MAXIMUM STRESS LIMIT. CONCRETE STRENGTH APPEARS TO CONTROL THE OVER-ALL BOND BEHAVIOR, PARTICULARLY SLIP AND DEOFRMATION, TO A MUCH GREATER EXTENT THAN THE SURFACE CONDITION OF THE BAR. /AUTHOR/
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Supplemental Notes:
- Vol 65, No 9, PP 743-756
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Authors:
- Kemp, E L
- Brezny, F S
- Unterspan, J A
- Publication Date: 1968-9
Media Info
Subject/Index Terms
- TRT Terms: Bars (Building materials); Bonding; Compressive strength; Concrete; Corrosion; Deformation; Dimensional analysis; Hot rolling; Impacts; Reinforcing steel; Rusting
- Uncontrolled Terms: Mill scale
- Old TRIS Terms: Dimensional measurement; Scale (Corrosion)
- Subject Areas: Bridges and other structures; Highways;
Filing Info
- Accession Number: 00208853
- Record Type: Publication
- Files: TRIS
- Created Date: Dec 30 1994 12:00AM