Comportamento mecânico de concreto compactado com rolo reforçado com fibras de polipropileno

Unconfined compression, triaxial compression, splitting tension, resilient modulus and fatigue tests were carried out in specimens of roller compacted concrete reinforced with 0.5% in weight of 24mm long and 0.021 mm thick randomly distributed polypropylene fibers, with the objective of evaluating strength and ductility increase, as well as a possible reduction of brittleness index due to fiber insertion. Besides, it was also assessed the influence of soilgravel matrix granulometry, regarding changes in the mechanical properties of the material due to inclusion of fibers in a similar fine grained matrix, where the thicker portion of the material was removed. Test results indicate that fiber inclusion increased strength and fatigue life, reducing initial stiffness, resilient modulus and brittleness index, being more effective for fine-grained soil matrixes.