Abstract
Building structures made of concrete are widely used in the construction of buildings, structures, transport facilities. Strength is the main characteristic of concrete as a structural material. The article describes in detail the process of manufacturing concrete samples based on various binders. The experimental determination of the cubic strength of concrete and the ultimate strength of concrete during bending is considered. To determine the ultimate strength of concrete during bending, an upgraded laboratory testing facility with a maximum load of up to 10 kN was used. It has been experimentally determined that the samples made from cement of the PC-D20-B brand have a greater value of the compressive strength of concrete after 28 days compared with samples from cement of the PC-D20-B brand + gypsum of the G-5 brand and only gypsum of the G-5 brand. The manufactured samples-beams made of cement of the PC-D20-B brand have a greater value of the tensile strength of concrete during bending over a period of time from 1 day to 28 days compared to samples made of cement of the PC-D20-B brand + gypsum of the G-5 brand and only gypsum of the G-5 brand. Thus, the results of tests of control samples made on the basis of a binder (cement and gypsum) for compression and stretching during bending fully give an idea of the methodology for determining the physical and mechanical characteristics of building materials.