On structural properties of the matrix phase of high-strength cement composites

Abstract

From the standpoint of structural mechanics of the destruction of materials, the most important element of the structure of cement composites is the cement matrix phase, which predetermines the quality of structural strength and the mechanical behavior of the composite as a whole. The disclosure of the functional relationship between the acting stresses and deformations is one of the main stages in the study of the mechanical behavior of any solids of structural purpose. A comparative comparison of the mechanical behavior of macrostructures of experimental samples of cement composites of different composition on three varieties of quartz sand under axial compression is shown experimentally. The assessment of diagrams on the ultimate longitudinal and transverse relative deformation, longitudinal and transverse relative deformation of short-term ductility (creep), transverse deformation coefficient and differential coefficient of volumetric deformation and its increments, plasticity measures, location level of parametric point, the initial elastic modulus and elastic characteristics, and the specific fracture energy on the total longitudinal strains and strains of short ductility is made. A comprehensive methodology for assessing the structural and mechanical parameters of the structural strength of cement composites, obtained together on each prototype, makes it possible to obtain more differentiated characteristics. They reflect the synergistic effects of the mutual influence of structural and destructive structure formation and hardening of cement disperse systems, due to the filler concentration and quality indicators of the dispersed phase of cement composites. This makes it possible to more fully study the mechanical behavior of the material under load that, in turn, makes it possible to move from simple determination of quality parameters to active material quality management.