Comparative Investigations of Some Properties Related to Durability of Cement Concretes Containing Different Fly Ashes

Abstract

abstractEN: The results of research of mechanical properties and selected other characteristics influencingdurability of cement concretes containing cement substitutes were presented. Cement concretesperformed with conventional fly ash, fluidised fly ash and their mixture were investigated. The obtainedresults were compared with findings registered for two types of concrete performed withoutcement replacements and with cement concrete containing silica fume. The results have shown thatcement concrete with predetermined 28-day compressive strength of about 50 MPa and good workabilitymay be obtained using different cement replacements. Generally, these cement concretes exhibitedalso favorable properties related to concrete durability, i.e. low permeability and sorptivity,and significant reduction of chloride migration coefficient. Favourable results were obtained for cementconcrete containing mix of conventional and fluidised fly ashes: good workability, compressivestrength after 28th day exceeding 50 MPa, low permeability of water, and low sorptivity, as well aslow coefficient of chloride migration. These features were similar as for cement concrete containingsilica fume.score: 15collation: 154-16