EMPIRICAL ANALYSIS OF FIBER REINFORCED SHOTCRETE

Abstract

In recent years, the use of fiber-reinforced concrete has increased significantly, with significant progress being made in terms of quality and application techniques. Due to its advantage in improving certain material properties, fiber-reinforced shotcrete is widely used in tunnel construction, airport runways, slope protection, and in mining tunnels. The use of this type of reinforced concrete has a number of advantages over other types of concrete. Using reinforced shotcrete provides a number of advantages. The economic advantages include: less labor, removal of ordinary reinforcement, a smaller layer for installation and saving time and material. While the technical advantages include increased load-bearing capacity, higher initial strength, smaller rebounds and a smaller amount of installation. From the analysis of time savings in the process of installing shotcrete with and without fibers, it appears that up to several hours of savings are achieved with the process of building shotcrete reinforced with fibers. A similar example is the application of shotcrete with an area of 30 m². The entire process using steel mesh takes 11.5 hours, while with fibers, 7.5 hours. From this it can be seen that for only 30 m², 1/3 of the total time is saved by using shotcrete reinforced with one of the fibers. This combination is combined in the unit price with using shotcrete reinforced with steel mesh and fibers. Unlike ordinary shotcrete, the strength decreases with the appearance of the first crack, while in reinforced shotcrete this is not the case because the stresses on the fibers are transferred to the adjacent sections. This means that if there is a larger amount of fibers in the concrete mixture, then it has the ability to carry greater loads. This has been confirmed by a series of experiments,  who will be represented in the paper