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Nowadays the use of recycled materials in the industry is increasing. An example of this is production of environmentally friendly green concrete. So far, various studies regarding the use of concrete debris from demolished concrete as aggregate in concrete have been utilized. The study showed that in addition of crushed concrete, brick and other materials such as, small ceramic rubble and other debris are present. The current study investigates the use of recycled materials resulting from construction debris as aggregate in concrete. Steel fibers recycled from old car tires are used to reinforce concrete and ordinary concrete. Samples with different percentages of recycled fibers and aggregates were made and tests such as compressive strength, tensile strength, flexural bending strength were adopted. Test results showed that the use of this type of fiber concrete as a structural concrete is acceptable. Yield line theory was used to investigate the role of steel recycled fiber and recycled aggregate concrete in slab design thickness. The design method showed that the addition of steel recycled fibers in the concrete reduces the thickness of slabs approximately by 20%. Nowadays the use of recycled materials in the industry is increasing. An example of this is production of environmentally friendly green concrete. So far, various studies regarding the use of concrete debris from demolished concrete as aggregate in concrete have been utilized. The study showed that in addition of crushed concrete, brick and other materials such as, small ceramic rubble and other debris are present. The current study investigates the use of recycled materials resulting from construction debris as aggregate in concrete. Steel fibers recycled from old car tires are used to reinforce concrete and ordinary concrete. Samples with different percentages of recycled fibers and aggregates were made and tests such as compressive strength, tensile strength, flexural bending strength were adopted. Test results showed that the use of this type of fiber concrete as a structural concrete is acceptable. Yield line theory was used to investigate the role of steel recycled fiber and recycled aggregate concrete in slab design thickness. The design method showed that the addition of steel recycled fibers in the concrete reduces the thickness of slabs approximately by 20%. Nowadays the use of recycled materials in the industry is increasing. An example of this is production of environmentally friendly green concrete. So far, various studies regarding the use of concrete debris from demolished concrete as aggregate in concrete have been utilized. The study showed that in addition of crushed concrete, brick and other materials such as, small ceramic rubble and other debris are present. The current study investigates the use of recycled materials resulting from construction debris as aggregate in concrete. Steel fibers recycled from old car tires are used to reinforce concrete and ordinary concrete. Samples with different percentages of recycled fibers and aggregates were made and tests such as compressive strength, tensile strength, flexural bending strength were adopted.

Keywords: construction debris, concrete, steel recycled fiber

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