The properties of special cements for shielding constructions in nuclear power plants

The results of studies of concretes from the special cements, destined to the production of shields against the radiation. The study included Portland cement, Portland fly ash cement, and cements with different content of granulated blast furnace slag. The application of special cements decreased the possibility of ASR occurrence. CEM I 42.5N LH/SR3/NA and CEM III/A 42.5N LH/HSR/NA usage in heavy concrete of gravity in the range of 3200-3600 kg/m(3), the compressive strength was in the range of 45-62 MPa and 62-81 MPa after 28 and 90 days, respectively. The comparison of the effect of CEM III/A 42.5N LH/HSR/NA usage instead of CEM I 42.5N LH/SR3/NA for heavy concrete production the systematic decrease of the rate of water absorption, decrease of coefficient of chloride ions diffusion, but increased the carbonation rate, was shown.