Development of an admixture to improve the quality of heavy concrete based on recycled industrial waste

The article presents the results of using a complex modified additive to improve the physical and mechanical properties of concrete. The complex additive includes industrial production wastes: metallurgical slag and alcohol production wastes (post-alcohol bard). To stabilize the hydrogen index the alkali KON is included in the composition of the additive. To assess the effect of the additive on the properties of concrete, a set of laboratory studies on measuring the strength, absorption, and frost resistance of test specimens was carried out. Comparison of physical and mechanical properties was made for samples of different concentrations of slag. The range of slag component in relation to cement was from 5 to 25 % by the total mass of the binder, a multiple of 5 %. The optimal composition of the mixture, with maximum strength values, corresponds to the percentage of slag 15%, post-alcohol bard 22.5 liters, alkali 150 grams. In general, the results obtained data points of the compared parameters showed consistent results with minimal variation in the data. The results obtained are of practical value related to the reduction of the cost of production of structural concrete with an increase in its strength indicators.