Вплив часу перемішування бетонних сумішей на деформативні характеристики конструкційних бетонів

This scientific work is a continuation of studies [1] related to the determination of the class of structural concretes at different mixing times of the concrete mixture. The influence of the mixing time of the concrete mixture on the strength characteristics of concretes has been established. As a result of strength tests of cube and prism specimens, the classes of concretes by strength under axial compression were determined. However, in the literature sources there are data on the influence of the deformability of concretes on the determination of their class by strength through the study of the modulus of elasticity of concretes. Therefore, the question arises of studying the deformability characteristics of concretes and their comparison with strength characteristics. Based on the results of these two studies, the final class of concrete can be determined. The analysis of the current state of development and research of concretes has shown that one of the factors influencing the determination of the class of concrete by strength is the determination of the modulus of elasticity of concretes, which characterizes their deformability characteristics. Under laboratory conditions, studies of the modulus of elasticity and the class of concrete were carried out at mixing times of the concrete mixture of 480, 300, 180, and 90 seconds, respectively. For this purpose, 20 prism specimens with dimensions of 100 × 100 × 400 (height) mm were manufactured and tested. In determining the class of concrete, non-force (volumetric) deformations of concrete and the cost of producing 100 m³ of concrete mixture based on electricity consumption during the mixing time of the mixture were also taken into account. As a result of the conducted studies, it was determined that to obtain a guaranteed class of structural concrete not less than C16/20 (B20), the optimal mixing time of the concrete mixture is 180 seconds. The purpose of the study is to investigate the deformational characteristics of structural concretes depending on the mixing time of the concrete mixture and their influence on the determination of the concrete class in terms of compressive strength.