Abstract:

Concrete is the most widely used building materials today's world. Production methodology and using of different types of materials affect the cost of concrete. The most important of these materials is cement. The low cost to be realized in cement will directly affect the economic efficiency of the concrete. Pozzolanic materials such as mineral admixtures can be used by replacing with cement in concrete production. In this study, three different types of pozzolanic materials (fly ash, silica fume, blast furnace slag) were replaced with cement in %10, %20 and %30 ratios and concrete samples were produced. The specimens were tested for compressive strength after curing in laboratory conditions for 7, 28 and 90 days. The highest compressive strength data were obtained in 10% silica fume replaced series. Microstructure studies were carried out on the specimens using SEM analysis technique and relations between strength values and microstructures were tried to be established. Ettringite formation was observed in fly ash replaced series. It has been determined that this situation may cause a decrease in compressive strength.

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