Scaling resistance and air void characteristics in concrete containing ggbs

In this paper we discuss the test results for concretes containing various amounts of ggbs as compared to concretes made with Portland cement. The main objective of these tests is to evaluate the influence of varying air content in such mixtures on the structure and frost resistance of concrete. The authors suggest that the approach presented here allows for a safe design of concrete mixtures in terms of their frost resistance. The results indicate that concrete can be resistant to surface scaling even at the W/C ratio markedly higher than 0.45. Increased addition of ggbs leads to a decrease in concrete resistance to surface scaling. Proper air entrainment is the fundamental factor for frost-resistant concrete, and the air void system has to be assessed (micropore content A300, spacing factor L ). The addition of ggbs increases pore diameters, thus, to obtain the appropriate air pore spacing factor, micropore quantities introduced have to be increased.

W artykule przedstawiono wyniki badań betonów z różną zawartością żużla w stosunku do betonów wykonanych z cementem portlandzkim. Celem badań była także ocena w jaki sposób zróżnicowana ilość powietrza w takich mieszankach (wahania ilości powietrza w mieszance) wpływa na strukturę porów powietrznych i mrozoodporność betonu. Zdaniem autorów takie podejścia pozwala na bezpieczne projektowanie betonów z punktu widzenia ich mrozoodporności.