Strength and Deformability of Biocidal Cement Composites

During the operation of buildings and structures, reinforced concrete structures are exposed to various loads that cause deformation and failure. The strength and elastic-plastic properties of modern concrete are controlled by introducing plasticizers, nanoadditives, and fillers. The biostability of composites is enhanced by adding biocidal additives. This article examines the deformation and failure of cement compositions modified with biocidal additives to create durable powder-activated concrete—a type of next-generation concrete. The potential of using guanidine-based compounds as a fungicide additive has been experimentally demonstrated. The key characteristics of concrete deformation processes are determined using stress-strain diagrams. Complete stress-strain diagrams for biocidal concrete are obtained and analyzed, showing a descending branch with an extended section of concrete loading at a constant, decaying strain rate, with a smooth decrease in stress. The concrete deformation diagram on the descending branch is fixed by the ultimate deformation, corresponding to the concrete achieving the maximum strength value, and the end point of the descending branch, corresponding to the residual strength of concrete. The dependences of the influence of the water/cement ratio and the biocidal additive on the main parametric points of the σ–ε diagram are studied. The obtained diagrams are analyzed. It is shown that the introduction of the biocidal additive increases the strength properties of the cement stone. Moreover, the role of the water-cement ratio is revealed: the strength of concrete on a test of normal consistency increased within the range of 12 to 65% (depending on the composition), with an increase in the water-cement ratio these changes are more significant – 29–79%. An increase in the water-cement ratio from 0.267 to 0.350 for compositions with a biocidal additive lead to a decrease in the strength of the cement stone by 27–39%

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