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dc.contributorUnited States. Army. Corps of Engineers. Nashville District.-
dc.contributor.authorBombich, Anthony A.-
dc.descriptionMiscellaneous paper-
dc.descriptionAbstract: Finite element method computer programs were used to calculate the temperature rise, transient temperature change, and resulting thermal strains during simulated construction of Martins Fork Dam. The investigation was conducted in two phases. Phase I, involving temperature calculations only, was performed to provide temperature rise data upon which to base a revised maximum allowable concrete placement temperature that would reduce the potential for thermal cracking. This information was needed before opening construction bids. As a result of Phase I, the recommended maximum allowable placement temperature was reduced from 85°p to 65°F for concrete with pozzolan replacement and to 60°F for concrete without pozzolan. Phase II was conducted after aggregate sources were selected to verify the placement temperatures selected in Phase I. Thermal properties of the concrete used as input to the temperature calculation program were modified as dictated by the results of thermal diffusivity tests of aggregate samples and because of increased heat of hydration from the cement accepted for Martins Fork Dam. Computer temperature simulations used the revised thermal properties and new maximum placement temperatures. Two thermal stress/strain simulations used calculated temperature distributions to calculate thermal stresses and strains. Results showed that when exposed to normal ambient temperatures, surface tensile strains reached 34 percent of estimated tensile strain capacity. When exposed to an extreme mean ambient temperature drop of 30°F sustained for several days simulating a cold front, tensile strains in the dam reached 95 percent of strain capacity. It was concluded that the selected maximum allowable concrete placement temperatures were acceptable and that protection against rapid and sustained ambient temperature drops as from exposure to cold fronts would best be achieved by insulation of exposed concrete surfaces rather than by further reduction in placement temperature.-
dc.publisherConcrete Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesMiscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-77-7.-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created from scans of the Print Resource.-
dc.subjectComputer programs-
dc.subjectConcrete placing-
dc.subjectConcrete temperature-
dc.subjectConcrete thermal properties-
dc.subjectFinite element method-
dc.subjectMartins Fork Dam-
dc.titleDetermination of maximum concrete placement temperatures for Martins Fork Dam-
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