Combined effect of steel fibres and steel rebars on impact resistance of high performance concrete

Abstract

The impact properties of normal concrete (NC) and reinforced concrete (RC) specimens, steel fibre reinforced concrete (SFRC) specimens and RC+SFRC specimens with different steel fibre dosages were investigated with the drop-weight impact test recommended by ACI Committee 544. The results indicate that the number of blows to final failure is greatly increased by addition of steel fibres. Moreover, the combination of steel fibres and steel rebars demonstrates a significant positive composite effect on the impact resistance, which results in the improvement in impact toughness of concrete specimens. In the view of variation of impact test results, the two-parameter Weibull distribution was adopted to analyze the experimental data. It is proved that the probabilistic distributions of the blows to first crack and to final failure of six types of samples approximately follow two-parameter Weibull distribution.

Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

“…After one to three more blows, this crack became wider and reached the cylinder edges, extended down to the bottom surface and splitting the specimens into two parts. This is the most common noticed brittle failure of plain cylinders, which agrees with most of the available literature [1,14,17,31,32,33,34]. However, it was also noticed that a minor crack may form before the failure of the specimen as shown in Figure 15(b).…”

“…First, all researches agreed that ductility ratio equals approximately 1.0 for plain concrete. Second, most of the reviewed literature [1,10,11,12,13,14,16,17,33,34] showed that for concrete reinforced with steel fibers (mostly crimped and hooked-end), the ductility ratio ranges between 1.1 and 1.4, which agrees well with the obtained results in this study. However, few researches [18,32] showed that steel fiber-reinforced concrete and steel-fiber reinforced high performance concrete can reach ductility ratios up to slightly lower than 2.0.…”

“…Yildirim et al [16] investigated the impact resistance of concretes reinforced with different types of fibers using the RBDWI test method. Chen et al [17] tried to experimentally evaluate the improvement in impact resistance gained from the combined use of steel reinforcing bars and steel fibers. They used the ACI 544-2R RBDWI testing technique on high performance concrete reinforced with 12 mm diameter bars and 35 mm length steel fibers.…”

“…Self-compacting concrete is like any ordinary concrete known to be of low tensile strength and impact performance. However, including fibers would enhance these properties significantly [15,16,17,18,19,20,24]. Yet, as the use of fibers has its advantages in improving the strength and structural performance, it also has the disadvantage of adversely affecting the workability of concrete mixtures.…”

Influence of Various Types of Steel Fibre on the Mechanical and Physical Characteristics of GGBS Based Geopolymer Concrete

“…Test findings showed that the efficiency under impact load in hybrid steel FRC was relatively high. Several experimental studies indicated that the use of fibres, especially steel fibres enhanced concrete impact strength [8][9][10][11][12]. Bernal et al [13] performed studies on the effect of steel fibre on slag-based GPC's mechanical properties.…”