FIELD STUDIES ON THE DURABILITY OF CONCRETE CONSTRUCTION IN A HIGH CHLORIDE-SULPHATE ENVIRONMENT.

Field data is presented on the deterioration of concrete structures in habitations on the Gulf coast where the environment is characterized by several interactive aggressive influences. The methodology of these durability studies is sequentially based on regional condition surveys, detailed studies of structural deterioration of concrete, chemical examination of samples from the deteriorated structures and an interpretation of the deterioration mechanism based on data from the studies. The relative importance of the operative causal factors is ascertained and the nature and incidence of rebar corrosion, concrete spalling, surface mortar deterioration and early-age cracking is assessed. Chloride migration in concrete is also studied in relation to the condition of the field samples. Recommendations are developed for obtaining improved durability of new concrete construction.