Anchorage of Epoxy-Coated Rebar Using Chemical Adhesives

Post-installed reinforcement is used to connect a new concrete member to an existing concrete structure. Use of traditional black steel in post-installed applications may lead to corrosion. To this end, MnDOT and local bridge owners have used and continue to use epoxy-coated rebar in anchorage applications with chemical adhesives (e.g., post-installed traffic barrier or pier crash strut). However, chemical adhesive suppliers (e.g., Red Head, Hilti, Powers, or ATC) have indicated that design tables specifying tensile pullout strength of rebar installed with a chemical adhesive were all developed using traditional black rebar. The objective of this project is to answer the following questions: What is the effect of the rebar epoxy coating on the tensile pullout strength when compared to traditional black rebar, where both types of bars are post-installed with the same chemical adhesives? Is the tensile pullout strength of epoxy-coated rebar greater or less than the tensile pullout strength of traditional black rebar? To achieve the project objectives, the researchers will conduct a laboratory study that involves casting and testing representative sample specimens that include both epoxy-coated rebar and traditional black rebar. The test setup and specimens will be built in accordance with ACI 355.4-11 entitled "Qualification of Post-Installed Adhesive Anchors in Concrete," which references the test setup outlined in ASTM E488-15 entitled "Standard Test Methods for Strength of Anchors in Concrete Elements." In each test specimen, the amount of applied load, displacement, and failure mechanism will be recorded.

Language

  • English

Project

  • Status: Active
  • Funding: $42,210.00
  • Contract Numbers:

    1003325 WO#54

  • Sponsor Organizations:

    Local Road Research Board

    395 John Ireland Boulevard
    St. Paul, Minnesota  United States  55155-1899
  • Managing Organizations:

    Minnesota Department of Transportation

    395 John Ireland Boulevard
    St Paul, MN  United States  55155
  • Project Managers:

    Bartelt, Mitch

  • Performing Organizations:

    University of Minnesota, Duluth

    Swenson College of Civil Engineering
    1405 University Drive
    Duluth, MN  United States  55812
  • Principal Investigators:

    Dymond, Ben

  • Start Date: 20171108
  • Expected Completion Date: 20190430
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01651540
  • Record Type: Research project
  • Source Agency: Minnesota Department of Transportation
  • Contract Numbers: 1003325 WO#54
  • Files: RiP, STATEDOT
  • Created Date: Nov 27 2017 12:28PM