Creep of High Strength Concrete at Elevated Temperatures
The object of research is a high-strength concrete containing silica fume, fly ash, and superplasticizer. This work aims to obtain experimental data on the creep strain of high-strength concrete at elevated temperatures and develop the expression for the description of creep strain (the specific creep strain) of high-strength concrete at elevated temperatures. Method. The creep of high-strength concrete at elevated temperatures was studied on not drying samples. Samples of high-strength concrete at the age of 90 days were heated at a rate of 10-15 ° C / hour to temperatures of 90 and 200°C and then loaded a constant load of 30% of the compressive strength of the test specimens determined at the age of 28 days. Results. The experimental studies confirmed other authors' conclusions that the creep strain increases with an increase in the temperature of heating. The creep strain at temperatures of 90 and 200°C by the end of the time under consideration was 3.6 and 4 times higher than the creep strain at a normal temperature of 20°C.