Assessing of Strength Parameters and Permeability of Polypropylene Fiber Reinforced Plastic Concrete

Plastic concrete is a kind of concrete that contains montmorillonite, which is the soil containing clay in addition to ordinary concrete materials. This concrete has lower compressive strength in compare with normal one, but has higher plasticity as a specification of ability to give higher ductility. In this study, the plastic concrete strength was increased by adding polypropylene fiber while maintaining ductility constant, and for this purpose, a concrete mixture was made, in which ratio of water to cement was considered 1.17 and ratio of bentonite to cement was considered 0.12. The plastic concrete was made by adding 0, 0.25 and 0.5 percent of polypropylene fiber, on which tensile strength, compressive strength and permeability tests were done. The results show that, the strength at 28 day increased significantly while the strength is about ordinary concrete at early age to 7 day and the effect of adding fiber on tensile strength is more than the compressive strength of concrete. The ductility and toughness strength have improved to a significant level based on stress-strain diagrams. Permeability of plastic concrete was increased by adding fiber in spite of the usual behavior for fiber reinforced concrete.