M Najimi - Concrete Department, Building and Housing Research Centre, Tehran, IRAN
F.M Farahani
A.R Pourkhorshidi

In this present study, the effects of adding polypropylene fibers on physical and mechanical properties of concretes are investigated. To this end, three concrete mixtures consists of 6 mm, 12 mm and 19 mm polypropylene fibers are made and their physical/ mechanical aspects are studied and compared with control concrete.The results manifest that adding polypropylene fibers increases the flexural strength slightly and decreases the cracks width. Besides, the compressive strength decreases slightly. These properties are improved with increase of fibers length .

concrete, polypropylene fibers, crack bridge, flexural strength, impact resistance