Abstract
Combining fiber with concrete mixes has become essential and its widespread use improves the strength of structural concrete elements. This research conducted an experiment into the structural performance of flat slabs with and without a square opening using four types of fiber (hooked-end, straight, corrugated steel fiber and polyolefin fiber) to gain a better understanding of how the variance of fiber type and shape effects the flexural behaviors of two-way slabs. The test program involved (a) testing the properties of hardened concrete, such as compressive properties, modulus of rupture and splitting tensile strength, and (b) testing the flexural behavior of two-way slabs. Ten slabs were divided into five pairs, including two specimens used as reference specimens (with and without openings), and eight other specimens with different types of fibers. Results revealed that the existing fiber in concrete improved the mechanical properties of hardened concrete mix, and the compressive strength test showed higher improvement in specimens with hooked and straight steel fiber. The flexural behavior of reinforced concrete slab was significantly enhanced, and the flexural strength capacity was especially improved for the slabs strengthened with hooked-end and corrugated steel fiber. Polyolefin fiber showed a slight enhancement of mechanical properties and good improvement in flexural capacity. Generally, the highest increments in compressive strength and modulus of rupture were 24.8%, 20% and 11%, and the ultimate load-carrying capacity of slabs was 39%, 13% and 19% for specimens with steel hooked, steel corrugated and polyolefin fibers, respectively, compared with control specimens.
Highlights
David Fall et al [2] investigated the effect of fibers on the structural behavior of four edges supported by a two-way reinforced concrete slab, such as in crack patterns and load-carrying capacity
Steel fibers in concrete produce a moderate enhancement of compressive strength
The fibers used in the concrete mixes increased the compressive strength by strength
Summary
The recent advances made in polymer material development have had a positive effect in engineering technology. Dapeng Yang et al [5] submitted a considerable experimental study on concrete slab reinforced with steel fiber against spall They investigated the mechanical properties of different concrete mixes with different fiber ratios. The mechanical properties showed a similarity with the results of other research, while in a field explosion conducted to study the dynamic response and damage modes, the results presented a good resistance to spall, especially the concrete reinforced with hooked steel fiber, where with an increase in the length of fiber and in the volume of the fiber ratio, the spall resistance was significant improved. Lijuan Zhang et al [13] investigated the effect of the shape of steel fiber (straight, corrugate and hooked) and volume ratio with different volume fractions (0, 0.5%, 1%, 1.5%, and 2%) on Buildings 2022, 12, 279 mechanical properties including the flexural strength of a prism. Those fibers capable of complying with the standards for residual strengths are called structural fibers, and are normally macro-steel fibers
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