HSFRCHealth Sciences Faculty Research Committee (South Africa)
HSFRCHigh-Strength Fiber-Reinforced Concrete
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Therefore, this study intends to compare the characteristics of the flexural behavior of HSC and HSFRC beams that have nearly identical concrete compressive strengths.
Mixture Proportions of the HSC and HSFRC. In this study, three mixing proportions, H100, H120, and HF120, were used to fabricate test beams, as shown in Table 1.
The 'R' series of beams (four numbers of reinforced HSC) and 'FR' series of beams (twelve numbers of HSFRC with fiber content 0.4%, 0.8%, and 1.2%) were provided with three 20 mm diameter high yield strength deformed bars as longitudinal reinforcement as illustrated in Figure 1.
The pattern of potential crack of HSFRC beams (FR Series) is similar to that of HSC (R series) beams.
Most of the studies on HSFRC have been carried out with a single type of fiber.
The results of the previous studies on concrete with hybrid steel fibers did not explicitly determine whether the use of hybrid steel fiber in fiber-reinforced concrete effectively improves the mechanical properties of HSFRC. Therefore, further studies on the effect of steel fiber characteristics, such as the type and length, on the mechanical properties of HSFRC concrete are needed.
The increase in ultimate deflection of HYFRC beam with 2.0% fibre content at 80%-20% steel-polyolefin combine was found to be 107% when compared to reference beam and 78% when compared with HSFRC beam containing 100% steel fibres.
Table 4 shows that the HSFRC and HYFRC beams exhibit enhanced ductility than that of the reference HSC beam.
The compressive strength development of HSC and of HSFRC and HYFRC provided an improvement at each volume fraction.
The development of splitting tensile strength of HSFRC and HYFRC at various volume fractions is shown in Fig.2 Compared to HSC, the strength improved with increasing the volume fraction.
Finally the NRC and HSFRC were poured separately into the mould of 600 mm x 600 mm x 150 mm to make them into test panels.
A field blast test was conducted on the NRC and also HSFRC panels to investigate the performance of the concrete panels under blast loading.