Verification of the Physical and Mechanical Properties of the Heavyweight Concrete Used in the Shielding Construction of Reactor Casing at the Nuclear Power Plant

Abstract:

The present paper deals with the determination of the mechanical and physical properties of the heavyweight concrete formulation used in the shielding construction of the reactor casing power plant. The recipe includes the use of baryte and cast-iron crumbs as fillers for the preparation of heavyweight concrete. The binder paste was obtained using CEM I 42.5 R with w/c ratio = 0.44 and a lignosulfonate-based plasticizer prepared according to the used Ralentol plasticizer's standard requirements, which is currently no more produced. The result of the concrete slump according to the S -cone was S1 (1 cm slump). The bulk density of fresh and hardened concrete was over 4000 kg m^-3. The compressive strength at 28 days exceeds 80 N mm^-2 and the flexural strength is 4 N mm^-2. The modulus of elasticity is 40 GN m^-2. The shrinkage of concrete is 0.52 ‰. The weight loss due to shrinkage rises to almost 1.3 %. The thermal properties of the heavyweight concrete are as follows: the thermal conductivity λ is 2.2 W m^-1 K^-1; the thermal resistance R for thickness d = 1 m is 0.44 m² K W^-1; volume heat capacity c_ρ rises to almost 2 J m^-3 K^-1 and thermal diffusivity a 10^-6 drops to 1,15 m² s^-1.

• Periodical: Materials Science Forum (Volume 1070)
• Pages: 223-229
• DOI: https://doi.org/10.4028/p-4nulnu
• Online since: October 2022
• Authors: Janette Dragomirová*, Martin Palou
• Keywords: Baryte, Cast Iron, Compressive Strength, Heavyweight Concrete, Thermal Resistance

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