IJSRD - International Journal for Scientific Research & Development| Vol. 4, Issue 04, 2016 | ISSN (online): 2321-0613
Experimental Study on the Behavior of Fiber Reinforced Concrete for Rigid Pavements T Pratap1 Y Mahesh2 PG student 2Assistant Professor 1,2,3 Department of Civil Engineering 1,2 Sankentika institute of technology and management, Visakhapatnam, A.P., India 1
Abstract— This project work involves in an experimental investigation on the influence of polyester and glass fibers on the mechanical properties of the concrete used in the rigid pavement. In this experimental study two types of concrete mixes were prepared individually. Polyester fibers of 0.1% to 0.4% and glass fibers of 0.1% to 0.3% 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, flexural strength properties. As the fiber content increases compressive, split tensile and flexural strengths are proportionally increasing. . In this study the observation shows that, the percentile of fiber content increases from 0%, 0.1%, 0.2%, 0.3%, 0.4% for polyester fiber and 0%, 0.1%, 0.2%, 0.3% for glass fiber in concrete mixes. By the experimental work the compressive, split tensile and flexural strengths are proportionally increased both polyester and glass fiber usage. It is observed that the optimum dosages of polyester fiber are 0.3% and glass fiber is 0.2% by weight of cement. It is found that with 0.3% polyester fiber and 0.2% glass fiber content results in 20% and 26% reduction of pavement thickness. Economic analysis is indicating that with the addition of polyester and glass fibers there is a saving in economy by 11.63% and 20.24% respectively compared to that of conventional concrete. Key words: Fiber reinforced concrete, Polyester fiber, Glass fiber, Compressive strength, Split tensile strength, Flexural strength I. INTRODUCTION In a developing country such as India, road networks form the arteries of the nation. A pavement is the layered structure on which vehicles travel. It serves two purposes, namely, to provide a comfortable and durable surface for vehicles, and to reduce stresses on underlying soils. In 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 strength and durability of concrete can be changed by making appropriate changes in its ingredients like cementitious 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 some deficiencies as low tensile strength, low post cracking capacity, brittleness and low ductility, 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 characteristic, which limits the application of the material, can be overcome by the inclusion of a small
amount of short randomly distributed fibers (steel, glass, synthetic and natural) and can be practiced among others that remedy weaknesses of concrete, such as low growth resistance, high shrinkage cracking, low durability,etc . The presence of micro cracks at the mortar-aggregate interface is responsible for the inherent weakness of plain concrete. The weakness can be removed by inclusion of fibers in the mix. Different types of fibers, such as those used in traditional composite materials have been introduced into the concrete mixture to increase its toughness, or ability to resist crack growth. The fibers help to transfer loads at the internal micro cracks. Such a concrete is called fiber-reinforced concrete (FRC). 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 glass fiber in concrete mixes. 2) To find out the optimum percentage of fiber content for polyester and glass 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 383-1970 and results are provided. 3) Coarse Aggregate: The material which is retained on BIS test sieve number 4 (4.75mm) is termed as coarse aggregate. The broken stone is generally used as a stone aggregate. The aggregate is
All rights reserved by www.ijsrd.com
1425