Carson Bates David Cain - NEI Electric Power Engineering

Engineering the Thermal Resistivity of Concrete Duct Banks keith malmedal Senior Member, IEEE NEI Electric Power Engineering 11049 W. 44th Ave Wheat Ridge, CO 80033, USA Bates Member, IEEE NEI Electric Power Engineering 11049 W. 44th Ave Wheat Ridge, CO 80033, USA David Cain NEI Electric Power Engineering 11049 W. 44th Ave Wheat Ridge, CO 80033, USA Abstract -- Cables are often installed in underground conduits surrounded by concrete. To calculate the cable ampacity in these duct banks the concrete thermal resistivity must be known. A set of experiments were performed to determine the effects that the concrete mixture has on resulting thermal resistivity. Concrete flow fill mixtures containing water-cement-sand and water-cement-fly ash-sand were studied. Experiments showed that water content of the mixture is not a factor in final concrete thermal resistivity unless fly ash was included in the mixture, however, the water to cement ratio is significant for all mixtures.

Engineering the Thermal Resistivity of Concrete Duct Banks Keith Malmedal Senior Member, IEEE NEI Electric Power Engineering 11049 W. 44 th Ave Wheat Ridge, CO 80033, USA

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  Bates, Naic, Keith, David, Carson, Carson bates david cain, Keith malmedal, Malmedal

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