摘要
Ordinary and high performance concrete （OC-C 25/30 and HPC C-50/60） made with fly ash has found numerous applications all over the world since 1970. In Kosovo, fly ash as cement substitution in concrete has not been utilized yet despite the large amount that is produced annually and the positive economical-environment aspects of such technique. This hesitance is due to the laek of experience in the concrete engineering field and because of the chemical composition of Kosovo fly ash, which is classified as non-standard high calcium fly ash （KF）. In light of this fact, this study intended to develop further. So, this paper reports the consistency, workability, shrinkage, high and ordinary compressive strength of concrete containing different percentage of non-class high calcium fly ash as Portland cement substitution （first case-Kosovo fly ash KF） comparing results with F class-low caleium fly ash content （second ease-Japanese fly ash JF） which is common used as cement replacement.
