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In this study, demolished concrete products were used after crushed and replaced with normal coarse aggregate besides the addition of fibers produced from manual chopping of plastic bottles used to preserve soft drinks were used to improve the Impact resistance and some mechanical properties of concrete. Two types of mixes were poured; the first type contains normal coarse aggregate with different fibers ratios, while the second type the normal coarse aggregate was fully replaced by crushed concrete products by adding the same different fibers ratios to the mix. Two reference mixes made for each type of concrete without adding fibers for the purpose of comparison. The results of concrete containing natural coarse aggregate, and fiber added showed a slight decrease in concrete density and an improvement in compression resistance and bending resistance at age (28) days. And improvement in the impact resistance of slabs at age (56) days. The results of concrete containing recycled aggregates and fiber added showed a slight decrease in the density of concrete and an improvement in compression resistance and bending resistance at age (28) days respectively, the impact resistance of the slabs improved at age (56) days.

Mechanical and impact properties of concrete slabs reinforced with waste plastic fiber with adding recycled aggregates