Moving Research Into Practice. Implementation of NCHRP Report 639: Adhesive Anchors in Concrete under Sustained Loading Conditions and NCHRP Report 757: Long-Term Performance of Epoxy Adhesive Anchor Systems

With the adoption of its eighth edition, the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications, Section 5.13, Anchors, is noted as being applicable to headed studs, headed bolts, certain hooked bolts, adhesive anchors, post installed expansion anchors, and post installed undercut anchors. The design specification references American Concrete Institute (ACI) 318-14, ACI 355.2, and ACI 355.4. These documents cover structural design of anchors and qualification testing for mechanical and adhesive anchors. Many design, materials, and construction engineers in state departments of transportation (DOTs) and the transportation industry may not be familiar with these ACI documents or the proper application of these documents and other related documents for design, specification, procurement, or inspection of the various anchor types. National Cooperative Highway Research Program (NCHRP) Project 20-07/Task 255, “Development of a Test Method to Determine the Ability of Adhesive Anchors to Resist Sustained Tensile Load,” and NCHRP Project 04-37, “Long-Term Performance of Epoxy Adhesive Anchor Systems,” conducted extensive research on adhesive anchor systems. NCHRP Project 20-07/Task 255 (published as NCHRP Report 639: Adhesive Anchors in Concrete Under Sustained Loading Conditions) provided an initial basis for developing AASHTO standards for sustained loads on adhesive anchors in response to recommendations from the National Transportation Safety Board to the FHWA, AASHTO, and the state DOTs. NCHRP Project 04-37 (published as NCHRP Report 757: Long-Term Performance of Epoxy Adhesive Anchor Systems) resulted in a draft specification for design and construction of adhesive anchor systems. NCHRP Report 757 includes a draft workflow process chart to aid agencies in the appropriate selection and specification of adhesive anchors. The report also contains appendices with draft AASHTO standards pertaining to the use of adhesive anchors in concrete including: (1) Test methods and specifications and material specifications and commentary for inclusion in the AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing, (2) Design guidelines, (3) Design specifications and commentary for inclusion in the AASHTO LRFD Bridge Design Specifications, (4) Quality assurance guidelines, and (5) Construction specifications and commentary for inclusion in the AASHTO LRFD Bridge Construction Specifications. These testing and material specifications made reference to the extensive and well-vetted testing program found within ACI 355.4 with a proposed exception for sustained-load testing. Design provisions for adhesive anchors in tensile loading were developed for AASHTO under given limitations. For cases that fall outside those restrictions, the designer was referred to ACI 318-11. Construction specifications were drafted for incorporation into the existing Section 29 “Embedment Anchors” of the AASHTO LRFD Bridge Construction Specifications, which previously addressed adhesive anchors. Quality assurance guidelines were drafted to orient construction and inspection personnel to adhesive anchor installation. The objective of this research is to develop and execute a plan for dissemination and successful application of research products presented in NCHRP Reports 639 and 757. For purposes of this project, “successful application” of the products is demonstrated by their adoption and use by practitioners. The plan shall be directed at all types of anchors allowed in the eighth edition AASHTO LRFD Bridge Design Specifications, Section 5.13, with training on anchor behavior, code design provisions, anchor selection guidance, qualification of anchors, anchor specification and procurement, anchor installation, and quality assurance. The primary thrust is training in the practical, everyday use of anchors. The dissemination and application plan shall present (a) a well-defined strategy for dissemination and application of the research products, (b) immediate actions that may be completed as a part of this project, and (c) longer-term actions that may be taken within a time period of no more than 3 years following the completion of this project. The strategy for dissemination and application of the research results may have a time horizon longer than 3 years, and shall include at least the following components: (1) Identification of institutions and individuals that will take leadership in dissemination and application of the research products (i.e., an implementation team); (2) Description of the audience or "market" for the products and a value proposition for their application by each principal audience segment; (3) Realistic assessment of impediments and drivers to successful application of the products; (4) Targeted technology transfer activities to achieve the project objective, such as, e.g., demonstration or pilot projects in host agencies, regional workshops and peer exchange meetings, creation of a “community of   interest”, development of promotional materials, etc.; and (5)  Assessment of the potential for further implementation of the products of NCHRP Reports 639 and 757 and their ongoing impact, including identification of specific challenges and remaining gaps that can inform future application of the products. The immediate and longer-term action components of the plan should be detailed (e.g., number of workshops, participants, pilot projects, presentations, etc.) and explicit regarding responsibilities of implementation team members. The contractor shall be responsible for recruiting implementation team members and ensuring that the members are aware that their responsibilities may continue beyond the contract period of the project.  

Language

  • English

Project

  • Funding: $100,000
  • Contract Numbers:

    Project 20-44(04)

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Harrigan, Edward

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

Subject/Index Terms

Filing Info

  • Accession Number: 01658416
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-44(04)
  • Files: TRB, RiP
  • Created Date: Jan 29 2018 3:05PM