ASSESSMENT OF CONCRETE RESISTANCE TO HIGH TEMPERATURES BASED ON STATE STANDARD 29167-2020
DOI:
https://doi.org/10.36773/1818-1212-2021-125-2-20-23Keywords:
high-strength concrete, fragility, crack resistance, ultimate strength, fracture toughnessAbstract
On the basis of the analysis of experimental studies, brittleness criteria for high-strength concrete at high temperatures are proposed and their threshold values are recommended, which are determined by the developed method for concrete at t=20°C. The brittleness criteria for high-strength concrete at high temperatures for operating structures are determined on the basis of the dependence of E and KIC on the surface hardness H. Based on the experimental data obtained, the value of the surface hardness (at) of high-strength concrete H>450 MPa is proposed, when heated, brittle fracture will occur.
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