Özet:

This paper presents the development of compressive strength for mortars with a high fly ash content produced with high volume of fly ash substitution with cement and the effect of high-volume fly ash substitution on compressive strength was evaluated using the efficiency factor of fly ash. This evaluation, made using the efficiency factor, provided a fair basis for comparing compressive strength obtained from samples containing high volume fly ash with control portland mortar samples. Although mortars containing fly ash could not match the compressive strength of control portland cement but samples containing 50% fly ash approached the control strength. For example, from experimental work, mortars produced with control portland cement for wet and dry curing developed strengths at most 118.7 and 98.7 MPa, while mortar mixture containing 50% fly ash developed 96.8 and 73.4 MPa. Assuming that the effectiveness of fly ash is zero and it is assumed to behave inert, the compressive strength to be developed by the mortar containing 50% fly ash should be equal to half of the portland cement mortar for wet and dry curing (58.4 and 49.4 MPa). It is understood that the presence of fly ash in the mixture is quite effective on the compressive strength and that it develops 65% and 48% more strength than the strength to be formed as a result of its inert behavior. As an additional observation, it has been revealed that mortars containing fly ash are more affected by wet curing conditions compared to portland cement.

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