The Experience of Concreting a Massive Dense-Reinforced Structure with the Provision of Thermal Crack Resistance

The basic principles of the technology for the production of concrete work in the winter during the construction of a massive densely reinforced structure of a distribution beam-slab are presented. The implementation of the technology provided the design characteristics of concrete and thermal crack resistance of the structure. The volume of the structure is 730 m³, the design class of concrete is B50, the reinforcement consumption is 741 kg/m³. The features of the technology were: the use of a modified low-cement self-compacting concrete mixture with low exothermic potential (cement consumption not more than 350 kg/m³) and low temperature (+5–15^оC); ensuring unimpeded heat exchange of the structure with the environment during the period of intense heat release of concrete until the maximum temperature in the middle zone of the structure is reached; regulation of the rate of cooling of the structure after reaching the maximum temperature in the middle zone of the structure by holding in tents and using thermal insulation materials. Taking into account the specifics of the design of the beam-slab, set by analogy with massive foundations, the temperature-time parameters of the technology were optimized based on the results of calculating the thermal stress state of this structure using the «Atena» program. The actual values of the concrete strength and the temperature parameters of keeping the distribution beam-slab fully complied with the calculated and regulated requirements: the actual average compressive strength of concrete was 61.3 MPa, corresponded to the actual class B_f57 and exceeded the requirements of the project (B50); the maximum temperature of concrete in the core of the structure did not exceed 61^оC; the temperature difference between adjacent height levels, as well as between the surface of the structure and the environment, did not exceed 20^оC; the average cooling rate of the structure did not exceed 3^оC/day. As a result of inspection and flaw detection of the structure, thermal cracks were not revealed. The convergence of the calculated and actual values of the main temperature characteristics of the distribution beam-slab shows the need to substantiate the technological parameters of concreting complex massive structures by the calculated-empirical way taking into account: the design features, working conditions, compositions and properties of concrete mixtures, the kinetics of cement hydration and heat release of concrete, as well as thermal conductivity of concrete at the initial stage of hardening, when calculating its thermally stressed state.

S.S. KAPRIELOV, Doctor of Sciences (Engineering), Academician of the RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.V. SHEINFELD, Doctor of Sciences (Engineering), RAASN Advisor (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.I. IVANOV, Candidate of Sciences (Engineering)

Scientific Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev JSC “Research Center of Construction” (6, bldg. 5. 2nd Institutskaya Street, Moscow 109428, Russian Federation)

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