Investigation of Grouted Coupler Connection Details for Accelerated Bridge Construction

This paper presents a laboratory investigation on the performance of grouted reinforcing bar couplers with the connection details similar to those utilized on the precast concrete elements of the Keg Creek Bridge on US 6 in Iowa. The testing program consisted of a series of static load tests, a fatigue test and evaluation of the chloride penetration resistance of laboratory specimens. The goal of this testing was to evaluate the ability of the grouted reinforcing bar couplers to develop flexural capacity at the joint between the precast elements as well as the durability of the connection. For structural load testing, seven full-scale specimens, each with #14 epoxy-coated reinforcing bars spliced by epoxy-coated grouted couplers, were fabricated and tested in three different loading cases: four-point bending, axial-tension plus bending and a cyclic test of the system in bending. The static load testing demonstrated that the applied axial load had a minimal effect on the formation of cracks and overall performance of the connection. When ultra-high performance concrete was used as a bedding grout, the initiation of crack was slightly delayed but no considerable improvement was observed in terms of the magnitude of the crack width during loading or the crack closure upon unloading. The results of the seventh specimen, tested in fatigue to 1 million cycles, showed little global displacement and crack width throughout the test, neither of which expanded measurably. No evidence of moisture or chloride penetration was detected at the grouted joint during the six-month monitoring.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 14p

Subject/Index Terms

Filing Info

  • Accession Number: 01763741
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-01841
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:10AM