Avaliação de desempenho de argamassas estabilizadas no estado fresco

Abstract

In recent years the ready mix mortar has become common in Brazil’s construction because it is a product that provides rationality and productivity in the construction site. Supplied on concrete batching plants, they incorporate entraining-air additives and retarders, making it workable for up to 72 hours. However, not much is known about the behavior of this material throughout the working day. Thus, the present work has as objective to evaluate the performance of ready mix mortar of 24, 36 and 48 hours in the fresh state by means of rheological tests. The properties analyzed were the consistency index, mass density, entrained-air content and rheological behavior by the Squeeze flow Test. The results showed a small loss of consistency over the storage time. The Squeeze-flow test showed that the ready mix mortars at 24 and 36 hours presented poor fluid behavior, which could impair the application and final touch steps. On the other hand, the mortar of 48 hours presented greater fluidity, possibly because it has a higher content of incorporated air.