THE EFFECTIVENESS OF DEBONDING MATERIALS FOR DOWEL BARS

Pull-out tests have shown that the effectiveness of bond-breaking compounds applied to dowel bars in road and floor slabs decreases with increasing time between applying the compound and casting the concrete. One of the four materials tested retained its effectiveness far longer than the others. Both the results of pull-out tests and experience on site indicate that bond may also be prevented by covering the bar with a plastic sheath, a technique which has several advantages over the use of conventional bond-breaking paints. A plastic coating, however, was ineffective as a debonding agent. (Author/TRRL)

• Corporate Authors:

  Cement and Concrete Association

  Wexham Spring
  Slough SL3 6PL, Buckinghamshire,   England 
• Authors:
  • Mulajkar, V N
• Publication Date: 1980-6

Media Info

• Features: Figures; References; Tables;
• Pagination: 7 p.

Subject/Index Terms

• TRT Terms: Adhesion; Bars (Building materials); Bonding; Coatings; Dowels (Fasteners); Economic efficiency; Measures of effectiveness; Paint; Plastics; Prevention; Pull out test; Reduction (Chemistry); Reinforced concrete; Slabs; Steel; Time
• Uncontrolled Terms: Bond (Adhesion); Effectiveness; Efficiency
• Old TRIS Terms: Reduction
• ITRD Terms: 5942: Adhesion; 3461: Bar; 3612: Coating; 3896: Dowel; 5911: Efficiency; 3807: Paint; 7454: Plastic material; 9149: Prevention; 6259: Pull out test; 4794: Reinforced concrete; 3491: Slab; 4542: Steel; 5414: Time
• Subject Areas: Economics; Geotechnology; Highways; Materials; Planning and Forecasting; Security and Emergencies; I32: Concrete; I35: Miscellaneous Materials; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00334836
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Report/Paper Numbers: Tech Rpt. 537 Monograph
• Files: ITRD, TRIS
• Created Date: Sep 16 1981 12:00AM