Effects of Steel Fibre Addition on the Mechanical Properties of Steel Fibre Reinforced Self-Compacting Concrete (Sccfibre)

摘要

Self-compacting concrete (SCC) mix that is highly workable has the ability to fill formworks and tight spaces between rebars under its own weight without applying any vibration. In this research, normal strength steel fibre reinforced self-compacting concrete (SCCFibre) of grade C30 was produced with the addition of Stahlcon HE 0.55/35 steel fibres at volume fraction of 1% (80 kg/m~3). The effect of the steel fibre addition on the SCCFibre mix was investigated in terms of its rheological properties (slump flow diameter and time, J-ring) and mechanical properties (compressive strength, splitting tensile strength, flexural strengths and moduli of elasticity). The compressive strength test was carried out using cubes of 150 x 150 mm, splitting tensile and MOE were performed using 150 × 300 mm cylinders while the flexural strength test was using beams of 150 × 150 × 550 mm. The results from the tests revealed that the workability and the rheological properties of the SCC mix specified by the EFNARC were decreased with the 1% addition of steel fibres. Similar decrement was also discovered in the compressive strength and the MOE value. In contrast, the splitting tensile strength, flexural strength and toughness showed significant increase with the introduction of the fibres.