Tensile characteristics of ultra-high-performance concrete

Abstract

In this study, the tensile properties of ultra-high-performance concrete (UHPC) with a large number of short steel fibres were investigated. In addition, the effects of fibre length, mono and hybrid fibres were studied in order to compare the performance of different UHPCs. Direct tensile tests of six groups containing steel fibres of 0–5% in volume content and three groups with the same fibre content of 2% were performed. Test results showed that short steel fibres were more effective in increasing compressive strength, tensile strength, ductility on a material level and energy absorption capacity without workability problems; the 13 mm long steel fibre was more effective in increasing compressive strength; UHPC with hybrid fibres had the highest ductility both on material and structural levels. The test results will be valuable for the application of UHPC.

Effect of Steel Fibers on Tensile Properties of Ultra-High-Performance Concrete: A Review

“…Figure 6 a summarizes the influence of the steel fiber content on the improvement index of the direct tensile strength. All the studies agree that the direct tensile strength increases with an increase in the steel fiber content (up to 5 vol.% [ 88 , 93 ]), even reaching 3.2 times that of a UHPC without fiber reinforcement [ 79 ]. The size of the dog-bone specimen affects the improvement of the direct tensile strength by the fiber content [ 45 , 75 , 80 , 93 ].…”

“…All the studies agree that the direct tensile strength increases with an increase in the steel fiber content (up to 5 vol.% [ 88 , 93 ]), even reaching 3.2 times that of a UHPC without fiber reinforcement [ 79 ]. The size of the dog-bone specimen affects the improvement of the direct tensile strength by the fiber content [ 45 , 75 , 80 , 93 ]. The fiber content affects the strain-hardening phenomenon of the UHPC.…”

“…In the research on the tensile properties of UHPC which combine straight and deformed steel fibers, some researchers think that the higher the content of straight steel fibers, the better the effect [ 50 ], while others think that a ratio of 1:1 is the best for improving the direct tensile strength [ 84 ]. In the study of the tensile properties of UHPC with different lengths of deformed steel fibers, some researchers have found that the combination effect was not as good as that of a single, straight steel fiber [ 93 ]. These results show that the effectiveness of the synergistic effect of different types and lengths of steel fiber combinations is the key to improving the direct tensile strength.…”

Structural Response of High-Strength Wire-Reinforced UHPC Slabs Subjected to Bending

“…According to the conclusion of Hu et al [ 45 ], the ascending section of UHPC tensile stress–strain curve can be regarded as an ideal elastic-plastic constitutive relationship, while the descending section adopts the formula obtained by Zhang et al [ 46 ]. where is the corresponding tensile stress of UHPC, is the tensile strain of UHPC when the tensile stress is reached.…”

Reactive Powder Concrete Mix Ratio and Steel Fiber Content Optimization under Different Curing Conditions

“…There are currently several studies being conducted on nano silica [10,11], nano calcium carbonate [12], carbon nanotubes [13,14,15], metakaolin [16,17], rice husk ash [18], glass powder [19], and superfine cement and mineral powder. The results of studies on the mixture ratio are not the same, but most of them focus on one or more factors, such as water-binder ratio [20,21,22,23,24,25], sand-binder ratio [21,22,23,24], fiber content [21,22,23,24,25], fly ash content [22,23,25], and silica fume content [21,22,23,25]. With high compressive strength and tensile strength as the target, analyses of the mixing ratio in the current literature reveal that the effect of the proportion of steel fiber content and mineral admixture on compressive strength, especially tensile strength of the RPC matrix, is significant.…”