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Effects of curing procedure on freeze-thaw durability of ultra-high performance concrete
Ultra high performance concrete (UHPC) is a relatively new composite material with many potential advantages in structural uses, including compressive strengths exceeding 200MPa, significant tensile strength, high ductility, and improved durability. The Federal Highway Administration is currently investigating a steel fiber reinforced UHPC in order to evaluate its performance and better understand its behavior for transportation industry uses. Freeze-thaw durability is an important characteristic of concretes intended for use in the highway transportation infrastructure. In this study, ASTM C666, Procedure A, was used to study the freeze-thaw durability of UHPC cured under four different curing regimes. In all cases, the relative dynamic modulus (RDM) of the test specimens exceeded 96% after 690 cycles. Specimens cured at ambient laboratory conditions showed a continuous increase in RDM to a level of 113% at 690 cycles. Since the beams in Procedure A are continuously surrounded by water, one hypothesis for the increase of the RDM is that the beams could be hydrating, even at low temperatures.
Effects of curing procedure on freeze-thaw durability of ultra-high performance concrete
Ultra high performance concrete (UHPC) is a relatively new composite material with many potential advantages in structural uses, including compressive strengths exceeding 200MPa, significant tensile strength, high ductility, and improved durability. The Federal Highway Administration is currently investigating a steel fiber reinforced UHPC in order to evaluate its performance and better understand its behavior for transportation industry uses. Freeze-thaw durability is an important characteristic of concretes intended for use in the highway transportation infrastructure. In this study, ASTM C666, Procedure A, was used to study the freeze-thaw durability of UHPC cured under four different curing regimes. In all cases, the relative dynamic modulus (RDM) of the test specimens exceeded 96% after 690 cycles. Specimens cured at ambient laboratory conditions showed a continuous increase in RDM to a level of 113% at 690 cycles. Since the beams in Procedure A are continuously surrounded by water, one hypothesis for the increase of the RDM is that the beams could be hydrating, even at low temperatures.
Effects of curing procedure on freeze-thaw durability of ultra-high performance concrete
Tanesi, Jussara (author) / Graybeal, Benjamin (author) / Simon, Marcia (author)
2004
11 Seiten, 3 Bilder, 6 Tabellen, 7 Quellen
Conference paper
English
Effects of curing procedure on freeze-thaw durability of ultra-high performance concrete
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