This work is a part of an industrial waste development program. It is devoted to the study of recyclability of chips resulting from the machining of steel parts as reinforcement for concrete. We are particularly interested in this study in the rheological behavior of chips reinforced fresh concrete and its mechanical behavior at young age. The evaluation of the workability indicates that the sand over gravel optimal ratios (S/G), corresponding to the composite minimum flow time, are S/G = 0.8 and S/G = 1. The study of the chips content (W) influence on the workability of the concrete shows that the flow time and the optimal ratio S/G increase with W. Mechanical characterization tests (direct tension, compression, bending and splitting) show that mechanical properties of chips reinforced concrete are comparable to those of the two selected reference concretes (concrete reinforced with conventional fibers: EUROSTEEL fibers corrugated and DRAMIX fibers). Chips provide to control concrete a significant increase in strength and some ductility in the post-failure behavior of the composite. Recycling chips as reinforcement for concrete could be thus favorably considered.
Mechanical behavior of steel fiber reinforced concrete has been studied by the direct tensile test. This fiber concrete is obtained by adding machining chips to the bare concrete. Six fiber contents were adopted (W=0.4%, 0.6%, 0.8%, 1%, 1.2% and 1.5%) for two sand over gravel ratio (S/G = 0.8 and S/G = 1). The results obtained showed that the fibers have substantially improved the stiffness and the strength of concrete and conferred a significant ductility to the material for the fiber volume fractions 0.4%, 0.6% and 0.8% (according to the S/G). The value of residual strength observed after cracking of the concrete matrix was of the same order as for the bare concrete for some of the compositions. Besides the tensile tests, compression tests have been performed. These tests showed that adding a low fiber percentage (W = 0.4%) provides a slight increase of the resistance to compression. Values of W greater than 0.8% lower this resistance. We can conclude that the presence of fibers in concrete is positive, bridging of micro cracks and recovery of the efforts through the developed macro cracks. Unfortunately, the reduction of the compactness has led to a decrease in the tensile strength and the compressive strength. The most advantageous fiber contents for compression are W = 0.4% and W = 0.6% for the two ratios .As for the tensile test, the most advantageous fiber contents are 0.6% and 0.8%.
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