Abstract
The paper presents the results of a great number of trial mixes concerning mix design of roller-compacted concrete (RCC). The particularity in this RCC was the use of a local fly ash, rich in lime and sulfates, which does not meet any existing specification. This was used in one project, the construction of a large RCC dam in Northern Greece. Measurements of the strength development and the elasticity of RCC mixes showed that the 80% (by weight) of the cementitious material could be substituted for this fly ash. Therefore it was proved that in RCC mixes this fly ash is more effective than in conventional concrete.
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