Development of Non-Proprietary Ultra-High Performance Concrete : Research Topic Statement
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2014-05-29
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By Cuelho, Eli
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Abstract:Ultra-high performance concrete became commercially available in the U.S. in 2000. Since then, UHPC has been actively promoted by the Federal Highway Administration. UHPC has mostly been used in the U.S. for field-cast connections of prefabricated bridge components, but may also be used for precast girders, precast piles, and thin-bonded overlays for bridge decks. UHPC is generally understood to be a concrete with compressive strength at least 20 ksi, post-cracking tensile strength at least 0.72 ksi, and a discontinuous pore structure that improves durability by limiting permeability. These properties are achieved with a low water-to-cement ratio, aggregate gradation optimized for high particle packing density, high quality aggregates and cements, supplemental cementitious materials, high particle dispersion during mixing, and incorporation of fiber reinforcement. A research study recently completed by FHWA demonstrated promising advances in the development of non-proprietary UHPC mixes with material costs ranging from $355 to $500/yd3 for non-fiber-reinforced mixes (adding fiber reinforcement increases the material costs by $417/yd3. Commercial mixes currently cost around $2,000/yd. This research will be accomplished by first conducting a literature review of UHPC to synthesize information regarding UHPC material characteristics, mix designs and applications. A second task would develop UHPC mixes based on non-proprietary mix designs using aggregates, cements, and supplemental materials from as many locally available sources as possible. The FHWA Tech Brief FHWA-HRT-13-100 (Development of Non-Proprietary Ultra-High Performance Concrete for Use in the Highway Bridge Sector) and companion report will be used as a starting point, in addition to other information found during the literature review. The following types of mixes are recommended for investigation: UHPC with fine aggregate only, UHPC with fine and coarse aggregate, and UHPC with fiber reinforcement. The following tests are recommended in this preliminary investigation: compression, flexural strength, splitting tensile, and freeze-thaw resistance.
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