Temperature and Humidity Dependence on Strength of High Performance Concrete

Abstract

The paper presents the results of investigation humidity and temperature influence on concrete of strength grades from B50 to B90. Dry and wet HPC specimens were exposed to different temperatures –60, -40,-20, 0,+20,+40,+60°C. The system parameters of the concrete structure were also examined: volume, surface area and extra finite difference energy of the solid phase, pore size. The results show that the effect of reduction of strength (Rebinder’s effect) of HPC depends on these parameters of the concrete structure. The maximum reduction in strength is fixed for concrete of В80—В90 grades, whose structure is notable for more developed interface between grain and phase boundaries and prevalence of nanopores in its structure.