Mechanical Behavior of Steel-Chips-Reinforced Concrete

Abstract

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.

Comportamiento físico-mecánico del hormigón adicionando residuos de acero: una revisión literaria

“…En muchos casos, las virutas de acero (figura 3) se utilizan en el hormigón; este se denomina hormigón armado con virutas de acero, por sus propiedades medioambientales y ventajas económicas [48]. Las virutas de acero se han utilizado ampliamente en el hormigón debido a sus propiedades especiales como afinidad con materiales cementosos, facilidad de uso, alta tenacidad y resistencia a cargas estáticas y dinámicas [49]; además, la aplicación de estos residuos actúa como un buen vibrador, facilita la compactación del hormigón premezclado, y crea así la posibilidad de agregar mayor contenido de partículas de acero al hormigón [50].…”

Use of Metal-mechanics Waste as an Addition in the Production of an Ecological Concrete

“…In [9], indicates that this trend can be attributed to the fact that the specific gravity of steel chips is approximately 42.8% greater than the specific gravity of the fine aggregate and that the greater the addition of chips the greater the weight is concrete unit.…”

“…In [22] explains that this trend may be due to the high density and strength of steel chips. On the other hand, [9] pointed out that at high VA contents, the reduction of concrete compactness causes a reduction in its compressive strength, however, it also observes a decrease in resistance. In this regard, [23] explains that this may be because the accumulation of iron residues in the cement particles forms a low penetration pseudomorph layer which causes a decrease in resistance.…”

“…In [9] explains that at small percentages, the chips increase the strength of the reinforced concrete by introducing some ductility in the post-fault behavior, and the fibers continue to support traction through the macro cracks; for high contents, the reduction of concrete compactness causes a reduction in its cylinder splitting tensile strength.…”

“…The autor [8] comments that at the age of 28 days, compressive strength increases between 10-15% and tensile strength increases 10-18%. The autor [9] indicates that both compressive strength and flexural strength increase after 28 days by 18% and 9% respectively.…”