Does the addition of steel fibres influence the workability of concrete?
Yes. The addition of steel fibres reduces the slump thus increasing the stiffness of concrete. It can be assumed that with typical fibre dosage rates of 20 to 40 kg/m³, the consistency is modified by one class (slump reduction of 25 mm to 45 mm) To compensate for the reduced workability SFRC should always incorporate the use of high-range water reducing admixtures like super-plasticizers.
