EFFECT OF HIGH TEMPERATURES ON CEMENT COMPOSITE MATERIALS IN CONCRETE STRUCTURES

Concrete is flexible construction material, which is utilized in various technological applications for underground structures and reinforcement of mine works (adits, tunnels etc.). In such applications, concrete has many functions - static function, water-tightness, gas-tightness, resistance to action of aggressive waters as well as durability. In case of railroad and road tunnel constructions, there is another important problem: influence of high temperatures on concrete lining during wildfire. The paper focuses on analysis of behavior of cement composite material (concrete) exposed to high temperatures. Several possibilities of increasing resistance of cement composites to high temperatures are proposed as well as recommendation for reduction of damage on structures exposed to high temperature.