Effect of Fiber Type on High Strength Concrete Mechanical Properties

Abstract

One of the most important characteristics of concrete is its resistance to tensile and bending. In order to improve these two characteristics, some fibers can be used to form fiber-reinforced concrete. There are many fibers, which may be synthetic or natural, that can be used and their properties can be applied in the formation of concrete that resists many external and internal forces, including polyester, glass, polypropylene, and steel fiber. The incorporation of steel (SF) and polypropylene fiber (PF) and the examination and the comparison of engineering characteristics of high strength concrete (HSC) are the principal objectives of this examination. The general method used in this research is by adopting one high strength concrete mix. However, the work and concrete mixes are divided into 3 groups. The first group includes 0% steel fiber with polypropylene fiber in proportions (0, 0.1 0.2, 0.3, 0.4 and 0.5%). The second groups includes 0.5% steel fiber with polypropylene fiber (0, 0.1 0.2, 0.3, 0.4 and 0.5%) and finally the third group includes 1.0% steel fiber with polypropylene fiber (0, 0.1 0.2, 0.3, 0.4 and 0.5%). Compared to the mixture of regular concrete, the improvement in tensile, compressive flexural strength is the main advantage of the mixture, which has been observed after adding the used percentage of used fibers, which has been deduced from this research as the placement of fibers in the mixture intensified the strength features of mixtures. The maximum compressive strength, flexural tensile strength has been recorded for P0.2+S1.0 with polypropylene increasing percentage of 15.30, 15.32 and 15.317% and steel increasing percentage of 34.03, 36.51 and 36.41% respectively.