MECANISMO DE FISSURA AO SOB TRA O DIRETA DE COMPóSITOS CIMENTíCIOS REFOR ADOS COM FIBRAS CURTAS DE SISAL

Although the use of vegetables fibers as reinforcement in cement based matrices goes back to the70s, few studies have been performed for analytical and experimental investigation of these composites indirect tensile. In this study, It was evaluated the tensile behavior of composite mortars reinforced with 1%,2% and 3% of short sisal fibers. The softening curve was represented by stress-strain diagram until first crackand, after this point, it was represented by stress-crack opening diagram. Compared with the matrix, whichshowed brittle fracture, the composites showed crack propagation to large displacements with maintenanceof residual stress. Analytical models based Fracture Mechanics were used to determine fracture energy andcharacteristic length of material and the results showed that presence of fibers increment the toughness ofcement based mortar under tensile.