LOAD-BEARING BEHAVIOR OF SHORT-FIBER-REINFORCED TEXTILE CONCRETE FOR A WRAPPING PROCESS

Abstract

In the research project WiFaPu (Wrapping Process for highly fiber-reinforced concrete using the example of a pump sump), a new manufacturing process for components made of Short-Fiber-Reinforced Textile Concrete is being developed. Wrapping concrete continuously around a formwork places high-level requirements on concrete and reinforcement properties. This paper presents the investigations on the load-bearing behavior of wrappable Short-Fiber-Reinforced Textile Concrete with uncoated textile reinforcement made of AR-glass in tensile tests. The placing of the concrete into the wrapped layers by casting, laminating or spraying as well as the short fiber content and warp/weft direction of the uncoated fabric have major influence on the load-bearing behavior of the tested specimens. Members produced in a spraying or laminating process showed low ultimate fabric stresses and unsatisfactory crack pattern in warp direction of the fabric due to the lacing of rovings leading to lower matrix penetration. Casting of specimens lead to significantly higher textile fracture stresses if textile fabrics are slightly tightened while installing in the formwork. Also vibrating the fine-grained concrete leads to better roving penetration compared to the spraying process. The addition of short fibers partially compensates negative effects of the textile weave in the warp direction.