Complex modified additive for concrete based on industrial waste
The article presents the results of studies of concretes with the use of additives developed based on industrial waste: ash, post-alcoholic bard, and soapstock. The aim of the research was to improve the physical and mechanical characteristics of concrete without increasing its cost. The research was carried out for samples of different ash concentrations and the corresponding percentage of the additive. The material quality was assessed by comparing the results of laboratory tests of the binder and concrete: strength, bending strength, setting time (for the binder); cube strength, water absorption, frost resistance (for concrete). The test results showed the effectiveness of the additive, which can compensate for the losses of physical and mechanical characteristics due to the inclusion of ash into the concrete (to reduce costs). The optimum concentration of the additive is 0.004% by weight of cement, with a cement ash replacement rate of 5%. At these proportions, the investigated parameters, albeit insignificantly, exceed the samples of the traditional composition of concrete without additive, and at a lower concentration of ash, they exceed them to a large extent. The obtained results of the study are of practical value, can be used in construction without reference to the region, as the applied wastes belong to the standard industrial sectors.