Analysis of the Strength Characteristics and Micro-Crack Formation Boundaries of Ceramic Concrete During Compression

Abstract

The article examines the physicochemical, strength, and deformation properties of keramzit concrete under short-term and long-term axial compression. Particular attention is paid to the kinetics of the microcracking process and the determination of parametric points—the lower (R_crc^o) and upper (R_crc^v) boundaries of microcracking in the structure of light concrete. Based on an analytical review of the research, the influence of the heterogeneity of the porous filler and the strength of the mortar part on the overall deformability and prismatic strength of the material is demonstrated.
The limitations of applying O.Ya. Berg's classical logarithmic dependencies in evaluating modern concretes were demonstrated, and new universal empir ical formulas were analyzed, accounting for the constant ratio of load levels ((η_crc^o)/(η_crc^v )=const) and the low density of keramzit concrete. The obtained results can be used to improve methods for designing and assessing the stress-strain state of concrete and reinforced concrete structures. Keywords: Keramzit concrete, lightweight concrete, prismatic strength, Poisson's ratio, deformability, microcracking, lower boundary of crack formation, upper boundary of crack formation, stress-strain state.