Joint ACI/ICRI Luncheon - November 22, 2019

    November 22, 2019
    11:30 AM - 1:15 PM
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    The Westin Atlanta Perimeter North
    7 Concourse Parkway NE
    Atlanta, GA 30328
    Venue website

    Meeting will be Hosted by The Georgia Chapter of ACI

    Click the link below to be redirected to ACI-GA's website to register for the event!



    Presenter’s Bio

    This presentation is a collaborative effort of the Geologists, Engineers, and Petrographers at SGS TEC Services, represented by speakers Aisyah Abdkahar, PG, Terry Vines, PG and Brian Wolfe, PE.

    Mrs. Aisyah Abdkahar, PG comes from a hard rock geology background, having conducted mineral exploration of gold, copper, silver, and other precious metals. Her work has brought her across North America, including Alaska, Yukon, NWT, Manitoba, and Ontario. Aisyah joined SGS TEC Services in 2015 where she is now a senior geologist and petrographer performing evaluations of aggregates and concrete. These days you will find her combing through sulfides in aggregates and dreaming of finding some precious metals when she isn’t home chasing after her 18 month old daughter. Aisyah holds a B. Sc. in Geology from the University of Manitoba in Canada and is a licensed professional geologist in the state of GA. Aisyah currently serves as Task Group Chair of ASTM C295/C294 Aggregate Petrography at ASTM C09.50.

    Mr. Terry Vines, PG has over 50 years of experience in the geologic and concrete industry, and rock and fossil collection habit that has exceeded the size of his garage. Terry is has extensive experience in concrete mix design, aggregate and concrete petrography, quarry exploration and evaluation, and forensic evaluation of concrete deterioratoin. Currently Terry is a Principal Petrographer for SGS TEC Services, but he is likely most well-known for his 30 years as a concrete petrographer and quality assurance manager with Argos/Lafarge. Prior, Terry’s career included many years performing geotechnical explorations for various companies and a long stint with Parsons Brinkerhoff providing consulting on the construction of the MARTA heavy rail transit system.

    Mr. Brian Wolfe, PE is a Principal Engineer and Concrete Petrographer with SGS TEC Services.  Born and raised in northern Illinois, Mr. Wolfe is a tortured Chicago Bears fan, a father of 3, and a graduate from the University of Illinois in Champaign-Urbana.  Mr. Wolfe’s 18 year career in the engineering field has included structural evaluations, repair design, nondestructive evaluation, forensic engineering, materials testing, chemical analysis interpretation, and petrographic evaluations of concrete.  Mr. Wolfe’s specialty experience of petrographic evaluation has encountered many projects in which the aggregate used caused significant concrete deterioration.

    Presentation Title:

    Aggregate Issues in Concrete: What happens if “bad” rock is used in concrete?

     Figure 1. ASR Micrograph

     Figure 2. Deleterious Aggregate Cracking

    Presentation Description:

    Deleterious aggregates can lead to expensive and unsafe deterioration in concrete, but this can often be prevented or mitigated with pre-emptive evaluation and testing. This presentation will discuss the quarry site inspection and laboratory tests necessary to prevent the use of deleterious aggregate and/or mitigate the effects. In addition, concrete distress from unsound aggregate, alkali-aggregate reactions (ASR and ACR), and pyrrhotite aggregates will be discussed. Finally, we will discuss how to look for indications of possible aggregate related distress in the field, the evaluation techniques necessary to confirm the cause, and the suitable repair options.