Influencia do tipo de agregado nas propriedades mecanicas do concreto submetido ao fogo / Aggregate types influence in mechanical properties of the concrete submitted to fire

AUTOR(ES)

Adriana Aparecida Ambrosio de Souza

DATA DE PUBLICAÇÃO

2005

RESUMO

This work deals with aggregate types influence in mechanical properties of the concrete submitted to high temperatures, evaluating the probable alterations to compression and tension resistances and elasticity module. An experimental study of the three chosen aggregates influence is presented, expanded clay, basalt and limestone in the concrete behavior submitted to 300°C and 600°C temperatures. Samples were molded with the chosen aggregates, using usual mixtures in the region of Campinas -SP - Brazil with 10cm x 20cm dimensions, where it was maintained as a fixed parameter, the water-cement relation for the three mixtures. Through mechanical properties, the effect of quick and slow cooling after the heating, and their probable recuperation by the concrete re-hydratation process is evaluated. The re-hydratation was done with part of samples immersed in water, and part of it evolved in plastic and the other part exposed to room temperature and moisture. The tests to evaluate mechanical properties were accomplished for the ages of 7, 28, 56 and 112 days. The results proved the decrease in mechanical properties, tensile strength, compressive strength and modulus of elasticity, indicated in international standards to concrete behavior under fire effect. It was showed the injurious effect of cooled rapdly and on the other hand, it was evaluated the re-hydratation contribution in residual mechanical properties. The results of this study are previously unpublished and they will be important for means of technical, lacking of these informations

ASSUNTO(S)

concreto - resfriamento agregados (materiais de construção) altas temperaturas aggregate (building materials) concreto slow cooling quick cooling resistencia de materiais mechanical resistance e re-hydratation high temperatures concrete

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