Experimental and theoretical researches of physical and thermophysical characteristics of centrifuged concrete

Abstract

Purpose. To determine the actual values of the density, percentage of water, coefficients of thermal conductivity and heat capacity of centrifuged concrete during heating.

Methods. Experimental determination of the density and percentage of water of samples from centrifuged concrete before and after heating. Theoretical studies of the coefficients of thermal conductivity and heat capacity on the basis of the data obtained.

Findings. The dependences of the density of concrete on temperature and location in a centrifuged structure are obtained. Indirectly revealed the variability of humidity of concrete over the cross section of the centrifuged structure. For the functions of humidity over the cross section and density with increasing temperature, the values of the correction factors are obtained, which allow, depending on the properties of the centrifuged concrete structure of various thickness, as a whole, to determine these indicators at each point. Theoretically obtained values of the coefficients of thermal conductivity and specific heat capacity for centrifuged concrete.

Application field of research. The research results can be used to solve the heat engineering problems of calculating the fire resistance of the above constructions.