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ACI 364.7-21

Evaluation and Minimization of Bruising in Concrete Repair - TechNote:
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ACI 364.7-21

Evaluation and Minimization of Bruising in Concrete Repair - TechNote:

PUBLISH DATE 2021
ACI 364.7-21
What is concrete “bruising,” how is it evaluated, and how can it be minimized? Bruising refers to damage in a surface layer of remaining substrate concrete that is weakened by fine interconnected cracks caused by the use of high-impact, mechanical methods for concrete removal and surface preparation. The bruised (or fractured) layer left by such surface preparation methods typically extends to a depth of 1/8 to 3/8 in. (3 to 10 mm) or more below the remaining substrate surface and, if not removed, generally results in lower repair bond strengths. Bruising, which can be detected through pulloff testing and petrographic examination, can be effectively minimized by selecting the most appropriate method and equipment for the given application. Keywords: bond strength; breaker; bruising; concrete removal; cracking; hammer; microcracking; pulloff test; repair; surface preparation.
SDO ACI: American Concrete Institute
Document Number 364.7
Publication Date Jan. 1, 2021
Language en - English
Page Count 5
Revision Level
Supercedes
Committee
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