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ACI WEBINAR

Managing Alkali-Aggregate Reaction Expansion in Mass Concrete

October 6, 1:00 - 2:00 pm EDT

Presented by: Marjorie M. Lynch, PE, President, Lynch Consulting Engineers, DPC

INDIVIDUAL purchase / GROUP purchase (up to 10 people)

Description:

When the alkalis in cement react with susceptible aggregate particles, a reaction rim of alkali-silica or alkali-carbonate gel is formed around the aggregate (AAR). If this gel is exposed to moisture, it expands, causing an increase in volume of the concrete. In mass concrete structures, the expansion can cause wide cracks and major operation and maintenance problems, such as inoperable gates and misalignment of hydropower generators. Maintenance and repair ranges from monitoring the AAR-affected concrete to complete removal and replacement, but mitigation methods are also available. Crack injection, post-tensioning, and slot-cutting can be implemented to reduce the impact of the AAR on the structure. Effective maintenance can accommodate continuing expansion, thus allowing most structures to achieve a long service life.

Learning Objectives:
  • Understand the mechanisms of deterioration and prevention of AAR in new construction.
  • Describe the methods of identifying AAR in existing mass concrete structures
  • Identify the repair techniques for mass concrete structures damaged by AAR.
  • Explain the ongoing process of monitoring of mass concrete structures after repair.
To Register:
  1. Visit the ACI Store to purchase this webinar:
    INDIVIDUAL purchase / GROUP purchase (up to 10 people)

  2. Redeem your Access Code by clicking the Access Code link in the receipt or copying and pasting it at ACI University (Redeem Code tab)

  3. Launch the webinar module (My Courses tab) and register with GoToWebinar
PDH Credit:
  • Individuals who purchase this webinar course and are logged into the live webinar (with full name and email address) for the entire duration will earn certificate of completion for 1 PDH (0.1 CEU).
  • For those who cannot join us live, the on-demand recording and quiz will be made available about a week after the LIVE presentation. Successful completion of the quiz will earn the certificate.
  • For those purchasing for a larger group, please look at our 10-pack purchasing option for groups.

Upcoming Webinars:

  • November- Cold Weather Concrete

  • December - Construction of Concrete Pavements

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