UT Tyler
Map of RCA sample collection sites, images of two samples, and graph showing how much of each sample fell into an acceptable size range.

Research: Recycled Concrete Aggregates

Presentations

Even though Recycled Concrete Aggregates (RCA) can readily pass the prescriptive requirements for coarse aggregates in structural concrete (ASTM C33 2008), the variability in material properties and quality needs to be quantified and incorporated into design. As a result, no engineering guidelines/standards currently exist for the design and construction of reinforced concrete utilizing RCA. Little or no previous work exists on the service and ultimate load performance of prestressed and non-prestressed concrete structures utilizing RCA from U.S. sources. Likewise, little or no previous work exists to quantify the economic and environmental benefits of using RCA in structural applications. The following list contains the presentations Dr. McGinnis and his research partners at UT Tyler, New Mexico State University, and Notre Dame have given to highlight the results of their research into using RCA for improved sustainability of reinforced concrete building structures:

  • Brandes, M., Devine, R., Kurama, Y., McGinnis, M., and Weldon, B. (2015) “Recycled Concrete Aggregates for Improved Sustainability of Reinforced Concrete Structures” ACI Fall Convention, American Concrete Institute, Denver, CO, November 8, 2015.
    • Presentation Topics:
    • Recycled Concrete Aggregate (RCA) Sample Collection
    • Sample Gradations
    • Natural Aggregate (NA) & RCA Properties/Relationships
    • Concrete Mix Design
    • Sorptivity/Relationships
  • De La Rosa, A., McGinnis, M. J. (2016). “Mechanical Behavior of Recycled Concrete Aggregates (RCA)" Concrete Sustainability Symposium, Civil Engineering Department, New Mexico State University, Las Cruces, NM, January 21, 2016.
    • Presentation Topics:
    • CA Sample Collection
    • Sample & Target Gradations
    • Natural Aggregate (NA) & Recycled Concrete Aggregate (RCA) Properties
    • Mix Designs
    • 28-Day Compressive Strength Results
    • Relationship between Theoretical Values and Measured Values
  • Davis, M., McGinnis, M. J. (2016). “Environmental Considerations of Recycled Concrete Aggregates (RCA)” Concrete Sustainability Symposium, Civil Engineering Department, New Mexico State University, Las Cruces, NM, January 21, 2016.
    • Presentation Topics:
    • Quantify land use required to produce Natural Aggregates (NA) & Recycled Concrete Aggregates (RCA)
    • Quantify water consumption to produce NA & RCA
    • Characterize transportation distances for NA and RCA
    • Estimate CO2 and energy consumption
    • Present an overall environmental impact index for RCA
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