Effect of Recycle Fiber on the Mechanical Properties of High Strength Concrete

Abstract

Concrete is experiencing a growing utilization trend in Algeria as a construction material due to its abundant availability and the continuous development of new construction sites. An important aspect for environmental preservation is the incorporation of waste fibers from bicycle brake parts in the production of high-strength concrete. This approach allows for the reuse of materials, thus safeguarding nature from the depletion of these resources. The objective of this research is to investigate the influence of fiber inclusion on the behavior of concrete, specifically focusing on achieving high-strength concrete through the utilization of silica aggregate and steel fibers. Modifications are made to the volume fractions, amount, and length of the fibers used in the concrete mixture. The fibers employed have a diameter of 250 µ and lengths 13 mm, and the volume fractions were 1.5%, 1.6%, 1.65%, and 1.75%. The results obtained demonstrate distinct properties of this new concrete compared to conventional concrete, particularly in terms of deformation and failure characteristics. Additionally, the addition of silica fume contributes to improved flexibility in the concrete. Notably, significant enhancements are observed in mechanical properties such as tensile and flexural strength, as evaluated through three-point bending and compression tests, attributed to the incorporation of steel fibers, with their effectiveness dependent on the quantity and length of the fibers used