Abstract
From industrial point of view, recently a great attention has been paid to the use of additives such as steel and polypropylene fibers in concrete and cement products. Investigations have revealed that the addition of steel and polypropylene fibers into normal concrete impart significant improvement in controlling its surface cracking, increase their tensile and flexural strength and durability. Considering the advantages of these additives, high strength concrete samples were produced with different mix design as well as using cement replacement materials such as silica fume according to a well-established experimental set up. The tests show that mixed use of steel and polypropylene fibers give good results in terms of improving structural characteristics of the concrete material developed. In all samples, the surface cracking was decreased significantly by adding suitable fibers in terms of sort, diameter, and length. However, the use of 1 kg polypropylene and 78 kg steel fibers in 1 cubic meter concrete was proposed as optimum mix design, regarding the improvement of compressive, tensile and flexural strength of concrete as well as scientific and practical points of view. So that, these newly developed structural concrete reveals promising potentials for further research and development as well as an structurally important building block material.
Highlights
Nowadays, concrete is by far the most widely used construction material
In order to optimize the benefits of fiber addition in concrete construction, the application of different fiber types into fresh concrete mixtures was introduced and commonly known as hybrid fiber reinforced concrete (HyFRC)
After preparation and treatment of samples in laboratory temperature and environmental conditions, tensile strength, compression strength, bending strength and slump measurements were performed on the samples along with measuring their weight at different conditions
Summary
Concrete is by far the most widely used construction material. It is versatile, has desirable engineering properties, and can be molded into any desired shapes and more importantly is produced with very cost-effective raw starting materials. The incorporation of short discrete fibers (steel, polypropylene, glass, carbon) can lead to practically useful improvements in the mechanical behavior of a given concrete mixture. In order to optimize the benefits of fiber addition in concrete construction, the application of different fiber types into fresh concrete mixtures was introduced and commonly known as hybrid fiber reinforced concrete (HyFRC). It becomes more popular in these recent years and expected to provide better physical and mechanical properties in concrete for structural purposes. In this study the influence of different amount of polypropylene and steel fibers content on concrete properties were investigated by measuring compressive, bending, and splitting tensile strength
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