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ACI 562: Code Requirements for Assessment, Repair, and Rehabilitation of Existing Concrete Structures

  • 20 Feb 2018
  • 11:45 AM - 1:00 PM
  • Maggiano's Little Italy North Park


Joint meeting  with ICRI North Texas Chapter

ACI 562: Code-Based Approach for Evaluation, Repair, and Rehabilitation of Concrete Structures


As reinforced concrete materials age, our concrete structures may need to be evaluated for safety based on changes in the operational and occupational use of the facility or the development of corrosion, alkali-silica reaction, or other distress mechanisms. Based on a structural evaluation, strengthening may be necessary and may be accomplished through rehabilitation or replacement. Rehabilitation and repair of existing concrete elements is generally a more sustainable approach than replacement; however, in the past, the lack of code requirements has resulted in variations in repair practice, inconsistent levels of safety and reliability, and no clear direction for building officials and institutional owners.

The American Concrete Institute (ACI) has developed a repair code that provides standard requirements for evaluating existing concrete buildings and the subsequent structural repair, rehabilitation, and strengthening of those structures. ACI 562 committee member and sub-committee chair, Carl J. “Chuck” Larosche will present a one-hour overview of the development and organization of the new ACI 562 Concrete Repair Code. The presentation will include reasons for and motivation behind the development of the Repair Code, the overall philosophy and organization of the material, the future direction of the Repair Code relative to adoption by the International Code Council as well as the potential concerns for design practitioners involved in repair or rehabilitation of reinforced concrete structures. Additionally, Mr. Larosche will present ACI’s Code approach to determination of unsafe conditions. 

The 562 Code approach provides the licensed design professional freedom to exercise engineering judgment when evaluating a reinforced concrete structure. Mr. Larosche will present practical examples of structural assessment, existing material evaluation, and load testing of existing structures using the ACI Code approach while illustrating design examples meeting the performance criteria provided in the Code. 

Speaker Bio

Carl J. "Chuck" Larosche, P.E. is a Principal at Wiss, Janney, Elstner Associates, Inc. (WJE) in Austin, Texas. Chuck joined WJE in 2004 with more than twenty years of experience specializing in consulting services for the preservation and restoration of historic and existing structures. In addition to his preservation work, Mr.
Larosche has extensive experience in building envelope, including traditional building materials as well as current state-of-the-art materials.

Prior to WJE, Mr. Larosche was a Principal of Sparks, Larosche & Associates and worked for The Texas Department of Transportation (TxDOT). Mr. Larosche's diverse background includes structural design, investigation, and evaluation of existing structures and materials. He has successfully combined hisbroad construction background with his knowledge of material behavior in existing structures to provide rare insight and knowledge in the area of masonry, concrete, and steel evaluation, including strengthening and repair of these materials.

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