EVALUATION OF PROTECTIVE PROPERTIES OF CONCRETES MADE OF CEMENTS WITH CALCAREOUS FLY ASH WITH RESPECT TO REINFORCING STEEL

The studies on the protective properties of concrete made of cements containing calcareous fly ash are presented in the paper. The aim of the studies carried out by electrochemical methods was to determine the susceptibility of reinforcing steel corrosion, protected by the analysed concretes, as well as to define the rate of reinforcement corrosion installed in the loaded and cracked samples, subjected additionally to the action of chloride solution. The obtained results were compared with the values of Portland cement concrete, considered as reference. The results showed that the addition of up to 50% calcareous fly ash do not reduce the protective properties of concretes with respect to reinforcing steel, while the use of fly ash together with blast furnace slag leads to the deterioration of reinforcement.