Combination of steel fibers and microfibers and theireffect on concrete behavior

Ultra-high performance concrete (UHPC) has ultra-high material performance includinghigh strength and high flowability. However, its tensile strain capacity is generally lowerthan that of high ductile cementitious composite. This study experimentally investigatedthe effect of hybrid combinations of straight ۰.۲ mm diameter steel fiber and variousmicrofibers on the mechanical properties of UHPC. Four types of hybrid fiber reinforcedUHPCs including steel, basalt fibers, polyvinyl-alcohol, and polyethylene fibers weredesigned 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 effectivefor improving the tensile strength of UHPC.

کلیدواژه ها:

Compressive strength ، Hybrid fiber ، Microfiber ، Steel fiber ، Tensile behavior ، UHPC.