Abstract: The invention relates to the composition of fresh concrete and admixtures for fresh concrete and can be used in the construction industry for producing monolithic and precast concrete and reinforced concrete structures, in spraying mixtures and also in the oil extraction industry when producing injection and insulation cement materials.

Abstract: The invention relates to a composition of fresh concrete and admixtures for fresh concrete and can be used in the construction industry for producing monolithic and precast concrete and ferroconcrete structures, in spraying mixtures and in the oil extraction industry for producing squeeze cement and insulation cement products. The admixture for fresh cement comprises super plasticizer C-3 and hydrophobing agent Lignopan B having a molecular weight ranging from 10 to 50 kJ, an antifoaming agent as the hydrophobing agent (139-282) and fixing salt and/or ammonium rhodanide or sodium and sodium carbonate having the following ratio of components (mass proportion): 0 to 40 of the super plasticizer C-3, 0.02 to 0.06 of the indicated hydrophobing agent, 10 to 20 of the indicated Lignopan B, 40 to 55 of the fixing salt and/or the ammonium rhodanide or sodium, 1 to 2 of sodium carbonate. The inventive compositions accelerate the setting and hardening of the fresh concrete and increase the strength of the concrete.