Polypropylene Fiber Reinforced Concrete as a Construction Material in Sudan

Abstract

Sudan one of the developing country in the world. In future high strength high performance concrete required for construction work .Concrete being the most important and widely used material is called upon to possess of very high strength and sufficient workability properties. Concrete made with Portland cement has certain characteristics: it is relatively strong in compression but weak in tension and tends to be brittle. Another fundamental weakness of concrete is that cracks start to form as soon as concrete is placed and before it has properly hardened. The weakness in tension can be overcome by the use of conventional reinforcement on the other had researchers is continues research the possibility of prevent crack formation and develop the concrete properties by used Fiber-reinforced concrete (FRC). FRC is a concrete containing fibrous material which increase its structural integrity, geometries, distribution, orientation, and brittleness also effect on strength. Polypropylene Fiber Reinforced Concrete (PpFRC) is an embryonic construction material which can be described as a concrete having high mechanical strength, stiffness and durability. Hence, this research was interested in finding out the effects of addition of various proportions of polypropylene fiber on the properties of concrete, also to know the optimum quantity of polypropylene fibers. 3D Polypropylene fibre reinforcement (AdFIBRE’ III) of different percentage (0.05%, 0.10%, 0.15%, 0.20%, 0.25% and 0.30%) was added in local concrete ( Sudanese material :cement and aggregate)) tests fresh and hard PpFRC in : workability, compressive strength, and flexural resistance tested at :3,7,28 days From the exhaustive and extensive experimental work it was found that: PpFRC enhanced performance of concrete by reducing blending ,segregation and plastic shrinkage crack , also we observed that : slump decreases with increases of PpF percentage, on the other hand compressive strength increase 8% when we add 0.05 % which is the best percentage of PpF , but generally we haven’t sufficient enhance in PpFRC due to reduce of workability , about flexure strength it increase with increase in PpF content the best percentage is 0.30% of polypropylene fiber that produced improved 12% in flexural strengths , as a result of more duality and bonding with fiber , less crack , there for the strength grown up, which observed clearly in the failure mode was become gradually.