HEAVY-DUTY CONCRETE WITH FROST RESISTANCE F400 WITH COMPLEX CHEMICAL ADDITIVES

The article presents the results of studies of the influence of complex chemical additives on the physical and mechanical properties of concrete, taking into account the curing conditions. It has been experimentally confirmed that the complex additive: the hyperplasticizer Hidetal GP-9-Alpha, 0,7% of the cement mass, and the air-entraining additive Hidetal P8, 0,05% of the cement mass, allows to obtain concrete with a denser structure, promotes equally active strength gain of con-crete in the early stages under air-dry curing conditions and under low-temperature heat and humidity treatment, at the age of 28 days under curing under heat and humidity treatment provides an increase in concrete strength by 15%. New experimental data are presented on the efficiency of the combined use of the hyperplasticizer Hidetal GP-9-Alpha and the air-entraining additive Hidetal P8 for obtaining concrete of class C32/40 with frost resistance grade F 400.