Influence of Preheating on Thermomechanical Properties of Heat-Resistant Ceramsite Concrete Based on Composite Binding Agent

The paper studies the influence of preheating on thermomechanical properties of heat-resistant ceramsite concrete based on activated composite binding agent. The basic composition of heat-resistant ceramsite concrete was used in the study. This composition included a ceramsite gravel of the Kizilyurt Ceramsite Plant as a large and small filler, as well as the composite binding composition of portland cement + impalpable ceramsite sand with the activation on a planetary mill Activator – 4M. The use of light heat-resistant concrete instead of single-piece refractory materials in kilns of various thermal units will allow decreasing the material consumption by 30-40% and reducing heat losses by 25-35%. [8]. The use of local construction materials allows increasing the efficiency of concrete in comparison with imported refractory materials. The composition of light heatresistant concrete with large and small fillers from ceramsite gravel of the Kizilyurt Ceramsite Plant and the activated composite binding agent based on the portland cement of the Buynaksk Cement Plant with impalpable ceramsite sand is developed for the study. The activation of a composite binding agent effectively increases the reaction capacity of a binding agent and reduces the water cement ratio, which improves the performance of concrete [1, 2, 10] due to the reduction of chemically unbound water in concrete. We believe that the preheating of a mixture prior to drying at a temperature of 105°C effectively affects the performance of concrete and reduces its destruction due to the presence of chemically unbound water. This reduces the number of microcracks in the structure of a concrete due to intensified hydration of the activated composite binding agent. The optimum mode of preheating and its influence on thermomechanical characteristics of concrete is defined. The influence of a concrete mixture preheating on its thermomechanical properties and efficiency of the accepted