To improve the concrete properties, various technological methods are used, the most accessible ones being the introduction of chemical additives into the concrete mixture, which can significantly reduce the costs level per unit of production; these additives improve concrete quality and effectiveness and reinforced concrete structures as well as increase their service life and buildings and structures in whole. This paper presents the results of studying the effect of introducing a superplasticizer with stabilizing effect of Polyplast SP – 2VU LLC Polyplast Novomoskovsk into concrete by analyzing the IR spectra of the additive in pure form and as part of hardened cement mortar (0.1–0.9%). Portland cement CEM I 42.5 B of Mordovcement OJSC was used as a binder; the aggregates were enriched with quartz sand from the Khromtsovsky deposit with a size of 2.4 and granite crushed stone of the Orsk deposit of 5–20 mm with water absorption of 0.2% . In the course of the work, the chemical composition of the additive SP2-VU itself and the hardened modified concrete composition were analyzed. Thus, the introduction of a modifier into a concrete composition leads to the change in its structure and strength characteristics. It was established with the help of IR spectra, that when the content of the additive in the cement mortar is 0.5%, a more ordered and stable hardened structure is formed. The reliability of the data obtained is confirmed by the identification of the main peaks. Due to the modification of concrete (at 0.3-0.5% in the concrete mix regulator concentration), the increase in the strength of the samples is more than 40%.

infrared spectra, superplastifying agents, additive SР2 VU, cement mortars, concrete additives, concrete manufacturing technology, concrete modification, concrete properties, research on frost resistance

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