Dynamics of Strength Gain of “Cold” Self-Compacting Fine-Grained Concretes during Winter Concreting of Joints

This work presented is a continuation of research of the structural and technological parameters of the quality of self-compacting fine-grained fresh concrete (SCFGFC) based on dry construction mixes (DCM) and concretes on their base (SCFGHC) during winter concreting of joints of precast reinforced concretes structures. Modification of the properties of cement concretes with the help of complex polyfunctional additives makes it possible to obtain the desired properties, including continuous hardening of concretes under negative temperatures. The use of such “cold” concretes for concreting joints makes it possible to ensure the continuity of the installation of large-panel buildings. The main parameters of the winter concreting technology with the use of “cold” concretes are high early strength and the design rate of growth of the in-situ concrete at negative temperatures. The carried out complex experimental study of the dynamics of strength gain of “cold” SCFGHC makes it possible to make up for the insufficient volume of research in this topics. For the study, SCFGHC based on dry mixes from three manufactures on cement binders, hardening at low temperatures are used. The assessment of the influence of early freezing on the compressive strength of concrete at an early age was carried out, the dependences of the strength set of “cold” concretes of 28 days of aging at the initial, average and minimal negative temperatures of laying the fresh concrete were obtained. The obtained results of the study significantly expand the field of application of “cold” concretes, can be used for the development of technological documentation for the use of “cold” SCFGHC based on cement dry mixes, as well as for the preparation of codes and technical documents on the technology of concreting joints of precast reinforced concrete structures at negative temperatures.

E.V. RUMYANTSEV¹, Chief Designer of Product Department (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.Kh. BAYBURIN², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.G. SOLOV’EV³, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
R.М. AHMED’YANOV⁴, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.V. BESSONOV⁴, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ “PIK-Proekt” LLC (19, bldg. 1, Barrikadnaya Street, Moscow, 123242, Russian Federation)
² National Research South Ural State University (76, Lenina Avenue, Chelyabinsk, 454080, Russian Federation)
³ National Research Moscow State University of Civil Engineering (26, Yaroslavskoye Highway, Moscow, 129337, Russian Federation)
⁴ «Ural Research Institute of Construction Materials» LLC (5/2, Stalevarov Street, Chelyabinsk, 454047, Russian Federation)

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