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Accession Number PB2014-103454
Title Splice Length of Prestressing Strand in Field-Cast UHPC Connections.
Publication Date Feb 2014
Media Count 46p
Personal Author B. A. Graybeal
Abstract The development length of reinforcements embedded into ultra-high performance concrete (UHPC) can be significantly shorter than the lengths normally associated with conventional concrete. Shortening the development length of prestressing strand can allow for a redesign of some structural systems, including spliced girder and continuous-for-live-load bridges. Ultra-high performance concrete (UHPC), when used in field-cast connections between prefabricated bridge elements, can create robust connections which emulate monolithic components. This study investigated the development length of 0.5 and 0.6 inch (12.7 and 15.2 mm) diameter untensioned prestressing strands embedded in steel fiber and PVA fiber reinforced UHPC. The volumetric fiber content was 2 percent. A novel tension test method allowed for replication of the tension-tension stress state that would occur when two strands are lap spliced within a connection between two linear elements. The results suggest that, for the steel fiber reinforced UHPC, the 0.5 inch (12.7 mm) diameter strands can be fully developed within 20 inches (0.51 m) and the 0.6 inch (15.2 mm) diameter strands can be fully developed in approximately 24 inches (0.61 m). The 0.5 inch (12.7 mm) diameter strands can be fully developed in the PVA fiber reinforced UHPC in approximately 36 inches (0.91 m).
Keywords Bridges
Fiber reinforced concretes
High strength concretes
Length
Prestressed concrete
Splices
Strands
Stresses
Tensile properties
Ultra-high performance concrete(UHPC)

 
Source Agency Federal Highway Administration
NTIS Subject Category 50C - Construction Equipment, Materials, & Supplies
50A - Highway Engineering
Corporate Author Federal Highway Administration, McLean, VA. Office of Infrastructure Research and Development.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1412
Contract Number N/A

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