MODIFIED CONCRETE WITH GRANULATED BLAST-FURNACE SLAG ADDITIVE HARDENING INTENSIFICATION
The kinetics of concrete hardening in normal conditions, after heat and humidity treatment, in the presence of Kratasol additive at partial replacement of 40...50?% of Portland cement with finely granulated blast furnace slag studied. The studies used a granulated blast furnace slag with a specific surface of 499 m2/kg and 12,2 MPa activities. The control samples of concrete compositions with 300 kg/m3 Portland cement do not contain finely granulated blast furnace slag additive. The tests have shown that concrete compressive strength after 3 days of normal hardening is 46...53?% lower than the strength of control samples, and after 28 days it is 5,8...12,7?% lower. As a result of the slag hardening intensification after the heat and humidity treatment according to mode (3 + 6 + 2) h the strength of the concrete at the age of 1 day was only 16,1...22,6?% below the control samples strength, and after 28 days at 7,7?%. When combined heat and humidity processing and Kratasol multifunctional plasticizing additive and aged 1 day concrete compressive strength is 13,8...16,7?% below the strength of the control compositions. At the age of 28 days the strength of the basic compositions is practically identical to the control samples strength.