- Author
-
Knab, L. I.
|
Spring, C. B.
- Title
- Evaluation of Test Methods for Measuring the Bond Strength of Portland-Cement Based Repair Materials to Concrete.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Sponsor
- Army Corps of Engineers, Washington, DC
Naval Facilities Engineers Command, Alexandria, VA
Air Force Engineering and Services Center, Tyndall AFB, FL
- Report
-
NBSIR 88-3746
April 1988
47 p.
- Distribution
- AVAILABLE FROM: National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161. Telephone: 1-800-553-6847 or 703-605-6000; Fax: 703-605-6900; Rush Service (Telephone Orders Only) 800-553-6847; Website: http://www.ntis.gov
- Keywords
-
portland cements; concrete; test methods; evaluation
- Identifiers
- bond strength; repair materials
- Abstract
- Three bond strength test methods were evaluated for screening and selecting repair materials used in overlaying and patching portland cement concrete. Bond strengths of three repair materials to base concrete were investigated using two uniaxial tensile bond strength test methods and a slant shear bond strength test method. The differing strengths of the repair materials caused different failure patterns, which had to be considered in the analyses of the failure stresses. Substantial differences in the failure stresses of the uniaxial tension and slant shear test methods were attributed to their different geometries and loading conditions. These differences emphasized the need to select test method(s) with geometry and loading conditions which are anticipated for the in-service repair material. For the two higher strength repair materials investigated, the relative precision (repeatability) of the slant shear and one of the uniaxial tensile test methods (pipe nipple grips) were comparable and relatively good (coefficient of variation values were about 5%).