Case Study: Ultra High Performance Concrete with Steel Fibers for the Route 624 Bridge in Virginia

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Title: Case Study: Ultra High Performance Concrete with Steel Fibers for the Route 624 Bridge in Virginia

Author(s): Celik Ozyildirim

Publication: Special Publication

Volume: 280

Issue:

Appears on pages(s): 1-12

Keywords: concrete, UHPC, ultra high performance concrete, durability, strength, permeability, crack control, ductility.

Date: 12/27/2011

Abstract:
Ultra high performance concrete (UHPC) containing steel fibers was used in five beams of the bridge on Route 624 over Cat Point Creek in Virginia. A test beam was also fabricated and tested to failure. The beam had strands but no shear stirrups. Test beam results indicated satisfactory load-carrying capacity. Preparation of the beams involved a longer mixing time and a two-stage steam curing to ensure optimum concrete properties. Testing of specimens at the hardened state showed that UHPC has high strength and high durability attributable to a very low water–cementitious materials ratio, low permeability, a high resistance to cycles of freezing and thawing, and tight cracks.