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The increase in compressive strength of vinyl-ester concretes with various content of fly ash of lignite FBC registered after 9.5 years in relation to fly ash mass content; the tendencies (statistical significance level α = 0.05) were determined separately for concretes where 21% of the quartz microfiller was substituted by fly ash (FA/M = 21%) and concretes where half of the quartz microfiller was substituted by fly ash (FA/M = 50%).
