Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effects of Curing on Bridge-Deck Concrete Shrinkage Cracking
This report describes performance of concrete overlays placed on concrete bridge decks before and after issuance of NYSDOT Engineering Instruction 86-24, which mandated discontinuance of monomolecular film and specified desirable rates of moisture evaporation from the newly poured plastic concrete during the curing period. It required rapid placement of wet burlap as needed to retard rapid evaporation of moisture, and prohibited concrete placement when a maximum evaporation rate might be exceeded. For field evaluation, 18 bridges were randomly selected, 9 built before and 9 after the change of policy. All were single-span with high-density concrete deck overlays. Cracking was surveyed, and information collected and reviewed on condition of the bridge decks at the time of concrete placement. Statistical analysis indicated that subsequent incidence of cracking did not differ significantly between the two groups of deck overlays.
Effects of Curing on Bridge-Deck Concrete Shrinkage Cracking
This report describes performance of concrete overlays placed on concrete bridge decks before and after issuance of NYSDOT Engineering Instruction 86-24, which mandated discontinuance of monomolecular film and specified desirable rates of moisture evaporation from the newly poured plastic concrete during the curing period. It required rapid placement of wet burlap as needed to retard rapid evaporation of moisture, and prohibited concrete placement when a maximum evaporation rate might be exceeded. For field evaluation, 18 bridges were randomly selected, 9 built before and 9 after the change of policy. All were single-span with high-density concrete deck overlays. Cracking was surveyed, and information collected and reviewed on condition of the bridge decks at the time of concrete placement. Statistical analysis indicated that subsequent incidence of cracking did not differ significantly between the two groups of deck overlays.
Effects of Curing on Bridge-Deck Concrete Shrinkage Cracking
R. A. Lorini (Autor:in) / M. M. Hossain (Autor:in)
1995
28 pages
Report
Keine Angabe
Englisch
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