Specifics of Monolithic Concrete Technology for the Construction of Agrocomplex Facilities

The results of research reflecting the specifics of monolithic concrete technology in the construction of agrocomplex facilities are presented. When designing concrete compositions for concrete pumping technology, not only provisions for creating optimal structures of artificial conglomerate were taken into account, but also technological factors that have a significant impact on the formation of the concrete structure. Cements of various compositions and an active mineral additive, which is a waste of industrial production, were used as binders. To ensure high connectivity and pumpability of concrete mixtures, water–reducing additives were used: superplasticisers based on polycarboxylates, which are both effective modifiers of the concrete structure. Modelling of concrete hardening acceleration processes was carried out in a laboratory steaming chamber according to the modes that ensure that concrete achieves the required stripping strength in an economically reasonable time. It was revealed that the negative impact of high temperatures, expressed in a decrease in the strength of concrete, is manifested to a greater extent for compositions with a high consumption of superplasticiser. It is stated that in order to intensify the hardening of monolithic concrete with polycarboxylate-based superplasticisers, it is necessary to optimise its composition and heat treatment parameters. In the production conditions of monolithic concreting, the following heat treatment parameters are recommended: the duration of pre-exposure is not less than 5 h, the rate of temperature rise is not more than 10 °C/h, the temperature of isothermal heating is 50–60 °C. The assessment of the quality of heat treatment of monolithic concrete should be carried out by the coefficient of heat treatment efficiency.