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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: High Volume Fly Ash RCC for Dams/Mixture Optimization and Mechanical Properties
Author(s): 0. Lahus and S. Jacobsen
Publication: Special Publication
Appears on pages(s): 331-348
Keywords: cement; dam; durability; fly ash; mechanical properties;
mixture proportion; roller compacted concrete; supplementary
Abstract:A series of roller-compacted concretemixtures were developed for the Norwegian Skjerka hydropower project. The mixture optimization was based on the medium-paste concept of the International Committee On Large Dams (ICOLD) using crushed aggregate from the dam site. The mixture optimization consists of a two-step procedure minimizing the paste content, keeping the compacted density above 97.5 % of the theoretical air-free density, and giving an optimal loaded Vebe time of 10 - 20 seconds. Nine mixtures were produced using low calcium fly ash and portland cement with various fly ash-cement propotions. The water-binder ratio was kept constant at 0.53 according to the Norwegian code for mass concrete for dams. The laboratory test results showed that 8 of 9 binder combinations produced RCC within the design criteria. The compressive strength development of the water-cured specimens was impressive despite the rather low cement contents, giving 1 year strengths of 2 times the 28-day strengths. The use of high-volume fly ash concrete for RCC dams is one example of concrete in harmony with lower environmental impact and less use of resources.
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