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Compression Response of a Rapid-Strengthening Ultra-High Performance Concrete Formulation
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2012-09-01
[PDF-1.88 MB]
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Abstract: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 fieldcast 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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Content Notes:The research discussed herein was completed at the Turner-Fairbank Highway Research Center. Portions of the work were completed by Global Consulting, Inc. under contract DTFH61-07-C-00011. Brenton Stone of Global was the co-Prinicipal Investigator on this project with Benjamin Graybeal who leads the FHWA Structural Concrete Research Program.
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