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Aggregate Reactions Affecting Concrete Durability

About the Webinar

Concrete is the most widely used construction material in the world. The durability of concrete may be described as “the ability of concrete to resist weathering action, chemical attack, and abrasion while maintaining its desired engineering properties” (PCA). The durability of concrete is influenced by a number of factors including design, materials, mixture, placement and exposure. This Webinar will discuss the role of aggregate selection and quality, with particular focus on the chemical reactions, alkali aggregate reactions and pyrrhotite oxidation. The presenter will discuss the existing test methods and guidance documents for evaluating aggregate sources, and the challenges involved. She will also discuss recommendations for testing, monitoring, and documentation.

April Snyder

About Our Presenter


April Snyder has over 20 years experience in concrete petrographic studies and serves as the Construction Materials Laboratory Manager and Senior Scientist at RJ Lee Group. She conducts evaluations of cementitious materials to identify failure and distress mechanisms using petrographic techniques in combination with chemical and physical testing. April is a past President of the American Concrete Institute (ACI) Pittsburgh Chapter, and remains on the Board of Directors.

April Snyder
Construction Materials Laboratory Manager
asnyder@rjleegroup.com

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Who Should View This Webinar?

Concrete industry product leaders, materials companies, sales leaders, and engineers. This Webinar may be appropriate for state and regional concrete and aggregates associations and members. Titles include: quality control titles, technical reps, materials titles, sales and development titles, aggregates and concretes senior leaders, company owners, plus engineering companies who consult on concrete quality issues.

How We Work With Your Industry

RJ Lee Group is a unique, full-service laboratory with consulting scientists experienced in petrographic analysis, including chemical and physical testing. We scientifically determine the root cause of degraded performance, including deterioration or structural failure.
 
Industrial Forensics Approach
  • InvestigateWe analyze new and historic construction materials, including concrete, mortar, brick, stone, tile, terracotta, pool plaster, aggregates and packaged repair products to determine the root cause of degraded performance, deterioration, or structural failure.
  • SupportWe use our expertise in concrete and corrosion to support engineering firms in defining structural condition assessments of reinforced concrete structures.
  • MaintainWe evaluate and qualify your raw materials (cement, fly ash, GGBFS, aggregate, etc) and provide Quality Assurance throughout the lifetime of your product, including during the construction process.
 
Petrographic Analysis and More

Our experts use standard methods, including optical and modern scanning electron microscopy techniques, to rapidly uncover the root cause of failure with standard ASTM, AASHTO, FHWA, DOT, BS EN, CSA Methods.
 
  • Concrete Failure - Identify the most common causes of concrete failure: ASR and ACR - Alkali reactions, delayed ettringite formation, external sulfate attack, chloride intrusion, freeze-thaw damage
  • Concrete DesignDetermine the "as-built" concrete mix design. We Identify supplementary cementitious materials, and determine actual construction practices
 
Related Services

Our industrial forensics approach combines expertise in corrosion and concrete to support engineering firms. We help define structural condition assessments of reinforced concrete structures, evaluate historical construction for adaptive reuse, and more.
 
 
 

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