IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 08, 2015 | ISSN (online): 2321-0613
Experimental Study on the Rigid Pavement with Comparison of Polyester and Coconut Fiber as a Partial Replacement of Cement P Hanitha1 Mahesh Yamala2 G Navya3 1 P.G. Student 2,3Assistant Professor 1,2,3 Department of Civil Engineering 1,2,3 Sankentika Institute of Technology and Management, Visakhapatnam, A.P., India Abstract— This project work involves an experimental investigation of the artificial and natural fibers those are polyester and coconut fibers on the mechanical properties of the concrete used in the rigid pavement. In this experimental study involves two types of concrete mixes were prepared individually. Polyester fiber of 0.5% to 2.0% and coconut fiber of 0.5% to 2.5% by weight of cement were added to the mixes. After that a comparative analysis has been carried out for conventional concrete to that of the fiber reinforced in relation to their compressive, split tensile and flexural properties. In this study the observation shows that, the percentile of fiber content increases from 0%, 0.5%, 1%,1.5% for polyester fiber and 0%,0.5%,1.0%,1.5%,2.0% for coconut fiber in concrete mixes. By the experimental work the compressive, split tensile and flexural strengths are proportionally increased both polyester and coconut fiber usage. It is observed that the optimum dosages of polyester fiber is 1.5% and coconut fiber is 2.0% by weight of cement. In this project cost analysis is also determined for conventional concrete and fiber reinforced using experimental test reports. By analyzing the cost it was found that polyester reinforced concrete pavement increases to 49.77% and coconut reinforced concrete pavement decreases to 4.20% when compared to conventional concrete. Key words: Coconut Fiber, Compressive Strength, Fiber Reinforced Concrete, Flexural Strength, Polyester Fiber, Split Tensile Strength I. INTRODUCTION A pavement is the layered structure on which vehicles travel. The main purpose of pavement is to provide a comfortable and durable surface for vehicles, and to reduce stresses on underlying soils. In a developing country such as India, the traditional system of bituminous pavement is widely used. Locally available cement concrete is a better substitute to bitumen which is the by product in distillation of imported petroleum crude. It is a known fact that petroleum and it’s by products are dooming day by day. The properties of concrete like strength and durability are varied by making appropriate changes in its ingredients like cementious material, aggregate and water and by adding some special ingredients. Hence concrete is very well suited for a wide range of applications. However Concrete has a brittle character, weak in tension, limited fatigue life, not capable of accommodating large deformations, low impact strength. Cement concrete is characterized by brittle failure, the nearly complete loss of loading capacity, once failure is initiated. This type of failure, can be overcome by the inclusion of a small amount of short randomly distributed fibers (artificial and natural) and can be practiced among others that remedy weaknesses of concrete.
By this we can minimize the shrinkage cracking, and increases durability and resistance. The presence of micro cracks at the mortaraggregate interface is responsible for the inherent weakness of plain concrete. The weakness can be removed by addition of fibers in the concrete mix. There are different types of fibers are used in traditional composite materials to increase the concrete mix toughness, or ability to resist crack growth. The main purpose of fibers are used to transfer loads at the internal micro cracks. This type of concrete is called fiberreinforced concrete (FRC). When concrete cracks, the randomly oriented fibers start functioning, arrest crack formation and propagation, and thus improve strength and ductility. Thus fiber-reinforced concrete is a composite material essentially consisting of conventional concrete or mortar reinforced by fine fibers. Polymer fiber reinforced concrete pavements satisfies two of the much demanded requirements of the pavement material in India economy and reduced pollution. It also has several other advantages like longer life, low maintenance cost, fuel efficiency, good riding quality, increased load carrying capacity and impermeability to water over flexible pavements. A. Objectives of the study 1) The main objective is to investigate the mechanical properties of concrete by adding polyester fiber and coconut fiber in concrete mixes. 2) To find out the optimum percentage of fiber content for polyester and coconut fibers to be added in concrete in relation to their mechanical properties 3) To find the thickness of pavement based on fiber material 4) Finally comparing the cost of pavement with and without using fibers. II. EXPERIMENTAL PROGRAM A. Materials Used 1) Cement: Ordinary Portland cement of grade 53 is used for this experimental work. 2) Fine Aggregate: The material which passes through BIS test sieve number 4 (4.75mm) is termed as fine aggregate usually natural sand is used as a fine aggregate at places where natural sand is not available crushed stone is used as fine aggregates. The sand used for the experimental works was locally procured and confirmed to grading zone II, sieve analysis of the fine aggregate was carried out in the laboratory as per IS 3831970 and results are provided.
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