OasisLMS

The primary objectives of the existing standard test methods for evaluating alkali-aggregate reactivity (AAR) in mortars and concrete is to identify the susceptibility of aggregates to undergoing alkali-silica reaction (ASR), to identify the effectiveness of supplementary cementitious materials (SCMs) in mitigating ASR, and quantify the suitable dosage level of SCMs in the concrete mixtures. However, these short-duration tests (the concrete prism test, mortar bar method test, accelerated mortar bar test, new concrete cylinder test, and new autoclave concrete prism test) have limitations in their ability to provide a direct measure of how a job’s concrete mixture might perform in the field over the long term. These sessions will shed light on developments in the areas of new test methods that are focused on assessing the alkali-silica reactivity potential of a job’s concrete mixture and new nondestructive test methods to evaluate the extent of damage in job concrete mixtures. Engineers, contractors, researchers, and students will benefit from learning about the latest research and test methods that will pave the way for a performance-based approach in specifying durability in concrete mixtures.

The contents of this course include four recorded presentations from the ACI 2016 Spring Convention:
• Limitations to Current AAR Testing Methods and Proposed Solutions by Michael D. A. Thomas, University of New Brunswick
• The Role of Alkalis in Alkali-Silica Reaction Tests by Michael D. A. Thomas, University of New Brunswick
• Emerging Rapid Aggregate and Concrete Test Methods for Evaluating ASR-Resistant Job Concrete Mixes by Anol Kanti Mukhopadhyay, Texas A&M Transportation Institute
• Autoclave Methods for Detecting Alkali-Silica Reactivity: Advantages and Limitations by Stephanie G. Wood, The University of Alabama

1. Identify the factors that influence evaluation of ASR potential in lab concrete and job concrete mixtures;
2. Discuss the deficiencies of existing standard test methods in evaluating job concrete mixtures;
3. Summarize developments in new test methods focused on evaluating ASR potential of job concrete; and
4. Explain how using blended binary portland cement concrete mixtures can assist in resisting ASR over the long term with use of reactive ASR aggregates.

Study the materials included in this module. Then, complete and pass the corresponding 10-question quiz with a score of 80% or higher to receive a certificate for 0.15 CEU (1.5 PDH).
Continuing Education Credit: 0.15 CEU (1.5 PDH)
Approved by AIA and ICC
Access Period: 30 days