PREDICTION OF LONG-TERM CORROSION-RESISTANCE OF PLAIN AND BLENDED CEMENT CONCRETES

This investigation was carried out to evaluate the relationship betwee n the early-age properties, such as compressive strength, pulse veloci ty, porosity, and permeability, and the long-term corrosion resistance of plain, fly ash, pozzolanic, and blast furnace slag cement concrete s. Results of compressive strength, pulse velocity, porosity, and perm eability tests were evaluated up to 180 days of water curing. The long -term corrosion resistance was evaluated after 7 years of immersion in 5 percent sodium chloride solution using electrochemical techniques. The data developed were statistically analyzed to establish relationsh ips between the long-term corrosion rate and the early-age properties of plain and blended cement concretes. The results of regression analy ses indicate excellent correlation between permeability and corrosion rate, and porosity and corrosion rate for both plain and blended cemen t concretes.