United States Department of Transportation
i
Comparison of conventional and internally cured concrete bridge decks in Utah : Mountain View corridor project.
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2014-12-01
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Abstract:The objectives of this research were to 1) monitor in-situ moisture and diffusivity for both conventional concrete
and concrete containing pre-wetted lightweight fine aggregate (LWFA), 2) compare deck performance in terms of
early-age cracking, compressive strength, and chloride ingress, and 3) compare concrete properties in terms of
compressive strength, chloride permeability, elastic modulus, and water content in the laboratory using cylinders
cast in the field at the time of deck construction. The research involved field and laboratory evaluations of four
newly constructed bridge decks located in northern Utah, two constructed using conventional concrete and two
constructed using pre-wetted LWFA to promote internal curing. Data from sensors embedded in the concrete decks
indicate that the volumetric moisture content and electrical conductivity of the internally cured concrete were higher
than those of the conventional concrete during the 2-year monitoring period. Laboratory data indicate that the
internally cured concrete was weaker at 1 year following deck construction, passed less current in rapid chloride
permeability testing, had a lower modulus in free-free resonant testing, and had a higher gravimetric moisture
content than the conventional concrete. In the field, the internally cured concrete was weaker at 2 years in Schmidt
rebound hammer testing and exhibited greater chloride concentrations at both 1 and 2 years than the conventional
concrete. The conventional concrete bridge decks had more reflection cracking from the joints between the
underlying pre-cast half-deck panels than the internally cured concrete decks.
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