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Experimental Study of the Behavior of Self-Compacting Concrete Slabs Reinforced with Fibers Under Impact Loads


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DOI: https://doi.org/10.15866/irece.v15i3.24114

Abstract


This study aims to evaluate the behavior of self-compacting concrete reinforced with fibers in slabs under static loads. Therefore, the current study was divided into two parts. The first part focused on producing self-compacting concrete reinforced with iron fibers or nylon fibers and studying the mechanical properties that include compressive strength and splitting tensile strength of hardened concrete. The second part of the research was concerned with studying the behavior of slabs under static loads. To achieve these goals, the performance of 11 self-compacting concrete mixes was prepared, examined, and evaluated, including five iron fiber-containing mixtures and five nylon fiber-containing mixtures, with volumetric ratios of 0.2%, 0.3%, 0.4%, 0.5%, and 0.6% for each type, and a reference mixture without the fibers. For this purpose, 66 concrete slabs with dimensions 500 × 500 × 50 mm were poured with quality control samples 33 standard cubes with dimensions 150 × 150 × 150 mm and 33 standard cylinders 300 × 150 mm. The results of the tests showed a significant improvement in the mechanical properties of these mixtures, which include the compressive and tensile strengths, and by reviewing the tests of all the mixtures, it was found that the concrete mixture containing iron fibers or nylon fibers with a ratio of 0.4% by volume is the best in terms of hardened mechanical properties. The behavior of the fiber-reinforced concrete slabs under the influence of a dynamic impact load was also studied and compared, and these results were compared with the reference concrete slabs that were not reinforced with fibers. time starts from the moment of implying the load and ends with the quenching of the slabs, where the displacement curves were drawn under the center of the slab-time, and the results showed an increase in the impact resistance of the slabs (the number of blows required for penetration with the increase of fiber content, where the fibers said the amount of the greatest depth and the quenching time of the concrete slabs). The results showed that concrete slabs reinforced with steel fibers have better dynamic properties than those reinforced with nylon fibers.
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Keywords


Self-Compacting Concrete Slabs; Fibers Reinforcement; Impact Loading

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