Dosagem experimental de concreto autoadensável com a adição de pérolas de poliestireno expandido

Abstract

Self-leveling concrete (CAA) is one of the greatest technological innovations in the civil construction market, because it has characteristics of fluidity and viscosity, it is capable of being densified only by its own weight. Its application becomes more necessary in structures with a high armature rate due to the difficulty of performing the mechanical densification, structures in which the self-weight is the most predominant dimensioning request, thus giving rise to the need to add to the CAA a lightweight aggregate to reduce its own weight without excessively reducing its resistant capacity. In this context, this paper proposes to study a self-compacting concrete partially replacing the aggregate with a light aggregate, expanded polystyrene (EPS), evaluating changes in the specific mass and resistance to axial compression of the concrete. In light of the above, this study had the laboratory analysis of the constituent materials of the concrete, which served as a basis for the dosage and experimental production of self-compacting concrete using EPS. In order to evaluate the properties of the concrete in the fresh state, the tests, Slump flow test, J-ring test and L-box test described by NBR 15823 (2010) were carried out in the preparation of the CAA, using the dosing method proposed by Tutikian (2007). In the hardened state the compressive strength characteristic according to NBR 5739 (2007) was evaluated. The results of the fresh state tests show that it is possible to use the EPS in the self-compacting concrete. However, the results in the hardened state show that it is possible to partially replace the large aggregate by the light to the proportion used in this study, 40% substitution, it was also possible to verify which is the best CAA family to be used.