 Some studies were performed using waste carpet fibers in concrete as an environmentally friendly use of recycled carpet waste.A carpet typically consists of two layers of backing (usually fabric from polypropylene tape yarns), joined by CaCO3 filled styrene-butadiene latex rubber (SBR), and face fibers (majority being nylon 6 and nylon 66 textured yarns).Such nylon and polypropylene fibers can be used for concrete reinforcement.