Coated sisal/PET hybrid braided textiles interface behavior into cementitious matrix

Intra-ply hybridization of two different braided yarns can enhance flexural and shear strength compared to conventional yarn properties. Hybrid braids offer the potential to reduce costs and boost industrial productivity. An impregnated textile with resin coating exhibits more cohesive behavior, ensuring stress distribution throughout the yarns and preventing a reduction in the composite's ultimate tensile capacity due to telescopic failure. This study aimed to develop new coated hybrid braided textiles made from sisal/PET for reinforcement employment in cementitious composites and to evaluate their bonding effect with the matrix through pullout tests. Materials were selected for tensile strength properties, thickness, and bonding characteristics. The braided fibers were chosen based on their strength and elongation (549N and 29.2%) and diameter (2.41 mm). They were coated with green epoxy resin and subjected to the pullout method for further evaluation. The results indicated that the best sample of the developed sisal/PET braided textile comprised 43% sisal and 57% PET, due to its higher elongation (29.17%), tenacity (216 cN/Tex), and tensile strength (549 N). The pullout properties demonstrated high energy absorption, reaching 2100.0 N.mm, which is 2.8 times higher than steel, exhibiting a pseudo-ductile behavior. This indicates its potential for use in cementitious composite reinforcement.