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The improvements of the mechanical properties, including bulk density of fresh mixtures, elastic modulus, and compressive strengths of four high - performance concrete mixtures, made with the addition of fly ash, refined ground blast - furnace microslag(microslag) and silica fume are studied. The concrete mixtures were determined based on the dispersion testing results. The study indicates that the elastic modulus at 28 and 91 days, and compressive strengths of the concretes are improved a lot when fly ash and microslag by 25 percent by weight of ce-
The improvements of the mechanical properties, including bulk density of fresh mixtures, elastic modulus, and compressive strengths of four high - performance concrete mixtures, made with the addition of fly ash, refined ground blast - furnace microslag (microslag) and silica fume are studied The study mixtures that determined based on the dispersion testing results. The study indicator that the elastic modulus at 28 and 91 days, and compressive strengths of the concretes are improved a lot when fly ash and microslag by 25 percent by weight of ce-