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

Price: $ 19.00 USD

Choose Product Language

Choose Product Units

Choose Product Format


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.


bond strength; breaker; bruising; concrete removal; cracking; hammer; microcracking; pulloff test; repair; surface



Document Details

Author: ACI Committee 364

Publication Year: 2021

Pages: 5


Formats: Protected PDF/Web View

Table of Contents







Any applicable errata are included with individual documents at the time of purchase. Errata are not included for collections or sets of documents such as the ACI Collection. For a listing of and access to all product errata, visit the Errata page.

Return/Exchange Policy

Printed / Hard Copy Products: The full and complete returned product will be accepted if returned within 60 days of receipt and in salable condition. A 20% service charge applies. Return shipping fees are the customer’s responsibility.

Electronic /Downloaded Products & Online Learning Courses: These items are not eligible for return.

Subscriptions These items are not eligible for return.

Exchanges: Contact ACI’s Customer Services Department for options (+1.248.848.3800 –