Abstract
In modern construction, considerable attention is paid to the search for environmentally safe and cost-effective methods to improve the performance of concrete. This paper investigates the potential of a complex admixture developed on the basis of industrial wastes, in particular microsilica, phosphogypsum, soapstock and post-alcoholic bard for concrete modification. The aim of the study is to evaluate the effect of each component of the admixture on the transformation processes of concrete, especially on its strength characteristics. Laboratory tests were carried out on specimens with different microsilica content and the results showed that the maximum strength increase was achieved at a microsilica content of 20 % in relation to the cement mass. Further analysis revealed a decrease in strength performance when the microsilica content increased above 20 %, which may be due to the overabundance of silica in the binder composition.