Fast-hardening workable concrete for the production of bored

The article presents the results of the effect of a complex additive on improving the physical and mechanical characteristics of the material. The evaluation of the physical and mechanical characteristics of concrete was made for four types of concrete. The main parameters were: setting time, compressive and flexural strength, water absorption. In the presented work the authors used a complex additive containing in its composition alkali (caustic soda), post-alcoholic bard (alcohol production waste) and hardening regulator (gypsum) in different ratios. It is shown that the combined use in the composition of a complex additive, which has well-compatible mechanisms of their influence on the processes of hydration, setting and hardening of the cement mass, mutually complements and enhances the effect of each ingredient of the additive. Increasing the concentration of the complex additive in the cement mixture up to 7% of the cement mass not only affects the process of cement mortar liquefaction, shortening the time of setting and hardening of the cement mass, but also increases the compressive strength of the cement in all periods of hardening. The analysis suggests that the complex additive provides a reduction in water absorption of concrete. It has been revealed that concrete with the studied complex additive has high physical and mechanical properties. The optimum dosages of the considered additive have been found and used in the present work.

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