SAVING ENERGY RESOURCES DURING THE HEAT TREATMENT OF CONCRETE DUE TO THE USE OF ADDITIVES

Abstract

Purpose of the work is heat treatment (steaming) of concrete and reinforced concrete products as an effective method of accelerating concrete hardening. Heat treatment of concrete is one of the most responsible construction processes. There are known cases when, due to the increased temperature of the concrete and large temperature differences, excessive temperature stresses arose, as a result of which cracks were formed. When choosing a method of heat treatment of concrete, you must first consider the possibility of using an energy saving method. Its extension is the introduction of additives – concrete hardening accelerators and cements of increased heat release (fast-acting and high-quality), as well as plasticizers and superplasticizers. Methodology. To reduce the duration of heat treatment or reduce the temperature of isothermal heating, it is proposed to use an additive obtained on the basis of the sludge of metal processing enterprises. The work uses standard research methods to determine the physical and mechanical properties of reinforced concrete and the quality of complex additives in accordance with DSTU 9208:2022, DSTU B V. 2.7-2.7-114-2002, DSTU B V.2.7-215:2009, DSTU B V. 2.7-214:2009. Findings. The effect of a complex slurry-based additive on the properties of reinforced concrete was investigated. The proposed additive increases the strength of concrete in all accepted heat treatment modes compared to the strength of concrete without such an additive. Originality of the obtained results is the following, theoretically substantiated and experimentally confirmed complex additive to concrete based on sludge (cake) of metal processing enterprises. The effect of the additive on the strength characteristics of concrete subjected to heat treatment under different regimes and natural hardening concrete is shown. Practical value. The results of the work are implemented in the production of reinforced concrete products and structures.