Superplasticized Concrete for a Prefabricated Powerplant Structure

by Nausherwan Hasan, Ebasco Services Inc, New York, United States,



Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources

Abstract:

This paper describes the use of superplasticized concrete in extremely difficult placements inside a restricted access preassembled powerplant structure (PPS) of a 192 MW Sidney A Murray Hydroelectric Station. It identifies the importance of preplacement testing and planning necessary to determine placing characteristics and limitations during construction to meet structural performance. Several concrete mixes with different combinations of cement, aggregate, fly ash and superplasticizer were evaluated by laboratory and site mock up tests to establish flowability, setting time, placement temperatures, lift requirements to optimize the mix design proportions and to assure filling the compartments of the PPS with minimum voids. The paper also describes the placement methods, rates and sequence for placing superplasticized concrete inside the PPS.

Subject Headings: Power plants | Hydro power | Construction methods | Concrete | Precast concrete | Electric power | Concrete construction

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