Formation of foam-concrete structure with thermomodified peat additive at early period of hardening

Studies of the influence of thermally modified peat additive ТМТ600 on the properties of foam are presented. It was found that the addition of ТМТ600 provides the formation of a stable foam system. Intensive migration of peat microparticles along the boundaries of the foam phase interface and the formation of large aggregates, especially in the nodes of the Plateau-Gibbs ribs, are noted. Results of the influence of ТМТ600 additive on properties of cement dough and cement stone are presented. When pre-baking ТМТ600 was introduced into Portland cement at values close to the normal density of cement dough, the setting time was accelerated and the compression strength of cement stone at 28 days of age was increased by 54.2%. Electrophysical properties (electrical capacity and resistance) of cement dough control samples and samples with the addition of ТМТ600 were investigated, showing that when ТМТ600 was added to the cement dough, there was a decrease in capacity and an increase in the resistance of the samples compared to the controls, which were also due to a change in the mobility of the O- and H+ ions and dipoles of water, and an increase in the proportion of bonded new growths. Results of the effect of ТМТ600 additive on properties of foam-concrete mixture and foam concrete are presented. It was found that when the ТМТ600 was administered at a concentration of 0.5 mass. %. in foam-concrete mixture, plastic strength index increases by 65% in comparison with control compositions, and strength at 28 days of hardening by 43%. At the same time, an increase in volume and closed porosity is observed, as well as a decrease in thermal conductivity.

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