Possibilities to forecast the frost resistance by structural parameters of concrete

Abstract

The work physical and structural parameters of concrete are determined: density (ρ), reserve of porous volume (R), effective porosity (We), relative wall thickness of the pores and capiliaries (D), degree of structural inhomogeneity (N) and exploitation frost resistance (FE). Possibilities to predict the exploitation frost resistance of concrete according to the indicated parameters are analysed. The various parameters of structure of concrete bodies (water absorption, effective porosity, reserve of pore volume, relative wall thickness of the pores and capillaries, degree of structural inhomogeneity) exert influence on frost resistance determined. It was found out that along with increase in effective porosity, the water absorption increases, the relative wall thickness of the pores and capillaries increase, with decrease in water absorption, the degree of structural inhomogeneity grows. The possibility to predict the service frost resistance of structural concretes according to structural parameters is proved by the reliable empirical equation.