United States Department of Transportation
i
Bond behavior of reinforcing steel in ultra-high performance concrete.
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2014-10-01
[PDF-2.20 MB]
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Abstract:Ultra-High Performance Concrete (UHPC) is a relatively new class of advanced cementitious composite
materials, which exhibits high compressive [above 21.7 ksi (150 MPa)] and tensile [above 0.72 ksi (5 MPa)]
strengths. The discrete steel fiber reinforcement included in UHPC allows the concrete to maintain tensile
capacity beyond cracking of the cementitious matrix. The combination of the matrix and fiber performance allow
for a reduction on the development length of reinforcing bar, thus providing the potential for a redesign of some
structural systems such as field–cast connections between prefabricated bridge elements. The bond behavior of
deformed reinforcing bar in UHPC is investigated in this study by conducting direct tension pullout tests. Over
200 tests were completed and the effect of embedment length, concrete cover, bar spacing, concrete strength, bar
size and type on bond strength were investigated. It was found that the development length of embedded
reinforcement in UHPC can be significantly reduced. Guidance on the embedment of deformed reinforcing bars
into UHPC is provided.
This report corresponds to the TechBrief titled “Bond Behavior of Reinforcing Steel in Ultra-High Performance
Concrete” (FHWA-HRT-089).
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