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Accession Number
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PB2012-112545
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Title
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Compression Response of a Rapid-Strengthening Ultra-High Performance Concrete Formulation.
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Publication Date
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Sep 2012
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Media Count
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74p
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Personal Author
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B. Stone B. A. Graybeal
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Abstract
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Compressive mechanical properties are critical indicators of the degree of hydration of concrete and are frequently used as indicators of other mechanical and durability properties. The rate of compressive mechanical response development is of importance to construction projects wherein the concrete hydration is on the critical path. Ultra-high performance concrete (UHPC), when used in field-cast connections between prefabricated bridge elements, can create robust connections which emulate monolithic components. Traditional UHPC formulations tend to express a delay prior to setting and initial mechanical property development. This research program investigated the compressive mechanical response of a new UHPC formulation intended for use in field-cast infrastructure connections. The time to initiation and rate of property development was observed to be influenced by the ambient environment surrounding the concrete during curing. At an elevated curing temperature, the UHPC was observed to reach 10 ksi compressive strength at 11 hours. The compressive strength, modulus of elasticity, axial strain at peak strength, and overall stress-strain response were captured under three curing conditions from early age through 56 days after casting. This report corresponds to the TechBrief titled Compression Response of a Rapid-Strengthening Ultra-High Performance Concrete Formulation (FHWA-HRT-12-064).
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Keywords
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Accelerated construction
Bridge elements
Bridges
Concrete
Concrete hydration
Elasticity
Fiber-reinforced concrete
Mechanical response
Ultra-High Performance Concrete (UHPC)
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Source Agency
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Federal Highway Administration
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NTIS Subject Category
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50A - Highway Engineering
89C - Construction Management & Techniques
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Corporate Author
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Federal Highway Administration, McLean, VA. Office of Infrastructure Research and Development.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1305
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Contract Number
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N/A
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