THEORETICAL MODEL OF RESISTANCE OF HIGH-STRENGTH, MODIFIED AND SPUN CONCRETE IN FIRE

Abstract

For reinforced concrete structures the fire resistance is an indicator that determines the area of their application in construction and characterizes the period of time when the structure retains its load-bearing and enclosing functions in case of fire. For theoretical determination of the fire resistance it is necessary to know the main characteristics of materials in normal conditions and the nature of their changes during high-temperature heating, in particular, when solving the strength problem of fire resistance – physical and mechanical properties.

This paper presents a theoretical model of high-strength, modified and spun concrete resistance in fire, the use of which allows to predict the behavior of structures made of it in fire and to estimate their fire resistance. This model was developed on the basis of a set of laboratory and theoretical studies of high-strength, modified and spun concrete under high-temperature heating.