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   Foundation Performance
   Association

   Houston, Texas

   Webmaster: Liz Stansfeld

SEPTEMBER 13, 2017
Wednesday, September 13, 2017
5:00 P.M. - 6:30 P.M. Technical Program (1.0 PDH)

LOCATION
Hess Club

5430 Westheimer
Houston, Texas 77056
713-627-2283
(Business casual dress code)

Your reservations are appreciated.  Please click here to make your reservation(s) online. If you are unable to register online, please contact Vicky Bonds at Geotech Engineering and Testing, Tel: 713-699-4000 at least 24 hours before the meeting.

Continuing Education Certificates will be provided at the end of the meeting for attendees that are current members and who have made reservations.

This technical program is complimentary to you thanks in part to our Room Sponsors:

Nelson Construction and Foundation Repair
Du-West
Ram Jack
VoidForm Products, Inc.

TECHNICAL PROGRAM

ASR and DEF Cracking - It Is Note As Bad As It Seems

Speaker: Alfredo E. (Al) Bustamante, P.E. Walker Restoration Consultants, Tel: 281-280-0068 

Mr. Alfredo E. (Al) Bustamante is a Principal and the Director of Restoration of Walker’s Mid-South region. He is a registered Professional Engineer in Texas and Louisiana. He received his Bachelor of Science in Civil Engineering from Old Dominion University in Norfolk, VA and Master of Science in engineering with structural engineering emphasis from University of Illinois at Urbana-Champaign, Illinois. Mr. Bustamante has over sixteen years of experience as a project manager for a variety of projects related to structural, architectural, and material distress. His experience includes the evaluation, design, and construction phase services of many precast concrete parking structures.

Mr. Bustamante is a past President of the Houston/Gulf Coast Chapter of SEAoT, the Chair of the FPA SC-02-0 subcommittee - Evaluation Methods for Existing Foundations (2007-2010), a member of the International Concrete Repair Institute (ICRI), the American Concrete Institute (ACI), the American Society of Civil Engineers (ASCE), The National Society of Professional Engineers (NSPE), National Academy of Forensic Engineers (NAFE), the American Institute of Steel Construction (AISC).

PRESENTATION SUMMARY

Concrete columns that are part of any structure exposed to moisture (i.e. bridge and parking structure perimeter columns) present a seemingly ugly picture when subjected to apparently severe cracking due to internal expansive forces from alkali-silica reaction (ASR) and delayed ettringite formation (DEF). Based on the presenter’s experience, and supplemented by several independent research studies, the apparently severe cracking in concrete elements subject to expansion forces from either ASR or DEF, or both, is often not as detrimental to the structural integrity of the column elements as it seems. The distress caused by internal expansion forces resulting from ASR and DEF primarily affects the concrete cover, but the core of the concrete columns confined by mild steel reinforcement is generally not significantly compromised. This presentation will discuss the cracking mechanism in concrete columns caused by ASR/DEF, present an introduction to a comprehensive approach to investigating this type of cracking, and describe a proven repair and monitoring program. The comprehensive approach to evaluate the significance of the cracking on existing precast concrete columns consists of up-close field observations, non-destructive testing, material sampling, inspection openings, petrographic studies, structural analysis, and reporting.

The presenter will discuss a repair program for column elements that are deemed to be structurally adequate, which consists of surface preparation, sealing cracks with flexible sealant, application of a clear sealer, and application of a silicone based paint system. The general goal of the repair approach is to maintain the relative humidity in the concrete column below the threshold that triggers the ASR and/or DEF mechanisms. The presenter will also discuss one or two case studies.

WHO SHOULD ATTEND?

Forensic engineers, forensic consultants, precast concrete engineers, parking garage engineers, coastal and bridge design engineers, foundation and pavement design engineers, geotechnical engineers, architects, concrete suppliers, general contractors, foundation contractors, and others interested in learning more about ASR/DEF cracking in concrete structures.

PAST PRESENTATIONS

To read a summary of a previous FPA presentation by Al Bustamante, please click

August 2010 - Test Methods for Evaluation Existing Foundations

 

 

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Al Bustamante, P.E.,
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