Combination of steel fibers and microfibers and their effect on concrete behavior

Seyyed Iman Hamdi¹

1) Master of Civil Engineering, Structural Orientation, Islamic Azad University, Neishabour Branch, Neishabour, Iran, Email: .

Publication : 7th.International Conference on Researches in Science & Engineering & 4th.International Congress on Civil, Architecture and Urbanism in Asia(7icrsie.com)
Abstract :
Ultra-high performance concrete (UHPC) has ultra-high material performance including high strength and high flowability. However, its tensile strain capacity is generally lower than that of high ductile cementitious composite. This study experimentally investigated the effect of hybrid combinations of straight 0.2 mm diameter steel fiber and various microfibers on the mechanical properties of UHPC. Four types of hybrid fiber reinforced UHPCs including steel, basalt fibers, polyvinyl-alcohol, and polyethylene fibers were designed and then compressive strength, density, and tensile behavior were investigated. Test results showed that combining a synthetic fiber with high strength, such as PE fiber, and steel fiber can improve the tensile behavior of UHPC and basalt fiber was effective for improving the tensile strength of UHPC.
Keywords : Compressive strength Hybrid fiber Microfiber Steel fiber Tensile behavior UHPC.