The Conventional Concrete of Cana Brava Hydroelectric Plant

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Title: The Conventional Concrete of Cana Brava Hydroelectric Plant

Author(s): A.N.M. Lopes, M.A. Pimenta, M.A.S. Andrade, A.S. Barbin, R.M. Bittencourt, and W. Pacelli de Andrade

Publication: Special Publication

Volume: 207

Issue:

Appears on pages(s): 51-68

Keywords: abrasion; alkali aggregate reactivity; blast furnace slag; concrete; durability; mechanical properties; permeability; silica fume

Date: 10/7/2002

Abstract:
The concrete studies for the Cana Brava Hydroelectric Plant were conducted on the basis of the following provisions: the prescriptions of the project’s Technical Specifications, with emphasis on the durability of the structures; the control of thermal-originated cracking; the use of alkali-reactive aggregates and on the Construction Consortium’s plan, which prioritized pumped concrete. These aspects led to the choice of a cementitious material ‘composed of blast furnace slag cement with addition of silica fume in all concretes used in the project. Therefore, this work will focus on the study of mixtures and the characterization of the Cana Brava concrete, both of which were held to meet the project provisions. The studies showed that the use of silica fume, through its beneficial effect in increasing concrete strength, enabled a reduction in the amount of cementitious materials, thus benefically contributing to thermal cracking control; furthermore, it proved advantageous in preventing the alkali-aggregate reaction and in reducing permeability.