Evaluation of Grout-Filled Mechanical Splices for Precast Concrete Construction

This report evaluates two proprietary grout-filled mechanical reinforcement splices, the Lenton Interlok and the NMB Splice Sleeve, for suitability in connecting precast concrete structural elements. The testing program included slip, fatigue, ultimate load, and creep. Both splices met the AASHTO LRFD provisions for slip and fatigue, demonstrating little displacement both before and after fatigue testing of 1,000,000 cycles with a stress range of 18 ksi. The ultimate loads of the two splices demonstrated that they are capable of exceeding 125 percent of the reinforcing bar’s yield strength, and in most cases 150 percent of the reinforcing bar’s yield strength. Subjected to sustained loading, neither of the splices showed susceptibility to significant creep displacements, though the limited data suggests epoxy coating may lower ultimate load capacity after sustained loading. Both products are recommended for use on department projects. Proposed revisions to the department’s Qualified Products List and Qualification Procedure for Mechanical Reinforcement Splices are included.

• Record URL:
  https://mdotjboss.state.mi.us/SpecProv/getDocumentById.htm?docGuid=2cc2a555-8ee2-4fd5-baf4-0a7757f73bc9
• 
• Corporate Authors:

  Michigan Department of Transportation

  Construction and Technology Division, P.O. Box 30049
  Lansing, MI  United States  48909
• Authors:
  • Jansson, Peter O
• Publication Date: 2008-5

Language

• English

Media Info

• Media Type: Web
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 74p

Subject/Index Terms

• TRT Terms: Concrete construction; Creep; Fatigue (Mechanics); Grout; Precast concrete; Structural members
• Uncontrolled Terms: Midspan splices; Slip
• Subject Areas: Highways; Materials; I35: Miscellaneous Materials;

Filing Info

• Accession Number: 01115153
• Record Type: Publication
• Report/Paper Numbers: R-1512
• Files: TRIS, STATEDOT
• Created Date: Nov 25 2008 7:31AM