چكيده به لاتين
Cementitious materials are inherently fragile in nature, because of this behavior, randomly distributed fibers are used to reinforce these materials. Engineered cementitious composites (ECCs) are a type of cementitious product reinforced with a specific type and percentage of fibers and exhibit strain hardening behavior and multiple cracks after the first crack, rather than brittle behavior. In this study, PP (polypropylene) fibers with three different cross sections (circular, triangular and triple blades) and PVA (polyvinyl alcohol) were used as reinforcement agents at 6, 9 and 12 mm in different volume percentages (5 (0, 1, 1.5 and 2%) and the compressive and tensile behavior of them were investigated. The results showed that the best tensile and compressive results were obtained from the hybrids. The tensile strength of the specimens is about 2 times more than that of the control specimens, and their toughness is 2 to 3 times, and the strength of the specimens is 3 times more, so it is conclude that hybridization of fibers has yielded good results. Triangular 1% PP and 1% PVA fibers performed very well in tensile and hybrid fibers of PVA 1.5% and 0.5% PP 9% with 9 mm length in compressive behavior.
