EFFECT OF SETTLEMENT OF CONCRETE ON RESULTS OF PULL-OUT BOND TESTS

DATA PRESENTED COVER THE RELATIVE INFLUENCE OF VARIOUS FACTORS INTRODUCED BY DIFFERENCES IN THE CHARACTER OF THE CONCRETE, REINFORCING BARS AND MOLD, AND IN THE ORIENTATION OF THE BARS AND METHOD OF PLACING THE CONCRETE. THE TESTS DEMONSTRATE THAT ADVERSE EFFECTS OF SETTLEMENT ON THE BOND RESISTANCE OF RIGIDLY HELD BARS CAN BE GREATLY REDUCED, EITHER BY USING A VERY SMALL AMOUNT OF ALUMINUM POWDER TO CAUSE A SLIGHT SWELLING IN CONCRETE OF 5- TO 6-IN. SLUMP, OR, WHERE FEASIBLE, BY REDUCING THE SLUMP OF THE CONCRETE TO 2 TO 3 IN. AND PLACING BY INTERNAL VIBRATION. THE EASIEST AND MOST PRACTICAL METHOD FOR MINIMIZING THE EFFECT OF SETTLEMENT IS BY IMPROVING THE MECHANICAL GRIPPING ACTION OF COMMERCIAL DEFORMED BARS. /PCA/

• Authors:
  • Menzel, C A
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Aluminum; Bonds; Concrete placing; Concrete tests; Deformed bars; Material reinforcement; Powders; Settlement (Structures); Slump test; Swelling; Vibration
• Uncontrolled Terms: Slumps
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213491
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 41
• Files: TRIS
• Created Date: May 25 1970 12:00AM