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By Vaughn O'Dea, PCS , Tnemec Company, Inc. and Cory Brown, Tnemec Company, Inc.
Presented at SSPC 2016; Session: Wastewater Coating Challenges and Solutions; Session chair: Cynthia O'Malley
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The use of concrete resurfacers and repair mortars under high-performance protective linings is a best practice to achieve a monolithic system for severe service exposures. Bond strength is the adhesion of the protective lining to the overlay, and the adhesion of the overlay to the substrate. Good bond strength is a key factor in ensuring acceptable surface preparation and achieving long-term performance. There have been numerous investigations leading to the development of different devices and test methods used to assess bond strengths of mortars and overlay materials. Industry standards include:
• ASTM D7234, Pull-Off Adhesion Strength of Coatings on Concrete Using Portable Pull-Off Adhesion Testers,
• ASTM C1583, Tensile Strength of Concrete Surfaces and the Bond Strength or Tensile Strength of Concrete Repair and Overlay Materials by Direct Tension (Pull-off Method),
• ICRI 210.3R, In-Situ Tensile Pull-off Tests to Evaluate Bond of Concrete Surface Materials, and
• DIN 18 555-6: 1987, Testing of mortars containing mineral binders: Determination of bond strength of hardened mortar.
There are fundamental differences between these methods that can dramatically impact tensile strength results. This presentation will compare and contrast these test methods, including tensile strength results from laboratory testing.
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