Avaliação de concreto de pós reativos com adição de fibra de polipropileno submetido a elevadas temperaturas

Abstract

Reactive powder concrete is a composite that is characterized by the use of extremely fine materials, due to the fact that it achieves the best possible packing. The addition of fibers to these concrete aids in its toughness and strength when subjected to heat. In this context, the present work aims to test the concrete of reactive powders against high temperatures with the addition of polypropylene fibers, in contents of 0.2%, 0.4% and 0.6% in relation to the mass of cement used. The methodology of this work was based on workability tests, resistance to compression and traction in flexion, voids index, water absorption and specific mass. The samples were evaluated under normal conditions and under conditions in which they were subjected to high temperatures of 200°C, 400°C and 600°C. The concrete presented high resistances and had an increase to them when exposed to high temperatures. Its workability was influenced by the addition of fiber in its mixture. In addition, the performance of the fibers against the spalling effect was positively observed. [resumo fornecido pelo autor]