INFLUENCE OF FLY ASH ADDITION ON THE COMPRESSIVE STRENGTH OF CONCRETE

Abstract

In the paper is analyzed the influence of fly ash dosage on the compressive strength of concrete. Five mixes were prepared, one witness without fly ash and the others with fly ash addition in dosages varying between 10% and 35% as replacement of cement. The cement type, water quantity, water/cement, water/cement+fly ash, aggregates dosages, type and dosage of superplasticizer were maintained the same for all mixes. The experimental results showed that the concrete mix with 10% fly ash had an increase in compressive strength of about 23.2%, in comparison with the witness. The mix with 35% fly ash replacement of cement had the compressive strength smaller than the witness with about 39%.