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The durability and the service life of reinforced concrete structures are currently a widespread concern among those involved in construction. The corrosion of the reinforcement caused by the action of chlorides has received special attention since there is high concentration of this ions in coastal zones. In this work the diffusion coefficients of three concrete admixtures are evaluated using the method prescribed by NT Build 492 and also through a relation from the through load determined by ASTM C 1202. A correlation evaluation of the results of both methods is presented. Finally, it is evaluated the influence of the method used for determining concrete diffusion coefficient on the determination of the cover depth needed to fulfill different service lifetimes. The results show that there are differences between the results presented by both methods and that these can be influenced by the quality of the concrete.

simpósio paranaense de patologia das construções

Ensaios acelerados de penetração de cloretos aplicados à estimativa do coeficiente de difusão do concreto e à vida útil de estruturas em ambiente marinho