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INSTITUTE OF TECHNOLOGY, NIRMA UNIVERSITY, AHMEDABAD – 382 481, 09-11 DECEMBER, 2010 1 Behavior of HDPE Fiber Reinforced Concrete Venu Malagavelli and Neelakanteswara Rao Paturu BITS-Pilani Hyderabad Campus Abstract—Solid waste disposal i.e. water bottles, polythene bags, disposable glasses, cement bags, cool drink bottles etc. was creating lot of environmental problems. An attempt has been made in this study by using solid waste (non-biodegradable) material in the concrete. Fiber Reinforced Concrete (FRC) is an emerging field in the area of Concrete Technology. This study mainly focused on the use of cement bags waste (High Density Polyethylene (HDPE)) in concrete. Concrete having compressive strength of 25 N/mm2 was used for this study. Cubes, cylinders and beams are casted with 0 to 6% of HDPE fiber with 0.5% increment. Samples were tested for the compressive strength, split tensile strength and Flexural strength and comparison analysis was made for the conventional concrete and modified concrete. It has been found that, increase in the compressive strength, split tensile strength and flexural strength of concrete by using the fibers. Index Terms-- Fibers, High Density Polyethylene, Workability, Compressive Strength, Tensile Strength, Flexural Strength. I. INTRODUCTION Concrete is made up of cement, sand, coarse aggregate and water mixed in a desired proportion based on the strength requirements. Concrete is very weak in tensile strength as compared with compressive strength. The main aim of researchers or concrete technologist is how to improve the tensile strength of concrete. This can be achieved by providing the reinforcement in the concrete. Reinforcement means it can be any material so that it will take the tensile stresses. Most commonly steel is used as the reinforcement in the concrete. In the present study, fibers have been used as the reinforced material in place of steel. From the literature, the addition of fibers in concrete would act as crack inhibitors and substantially improve the tensile strength, cracking resistance, impact strength, wear and tear, fatigue resistance and ductility of concrete. There is lot of research is going on in this area past three decades and its continuing. In the early ages the steel fibers are used as reinforcing material. Fiber reinforced concrete (FRC) is primarily used for the rigid pavements. At present FRC is using in all the areas including bridges, water retaining structures, retaining walls, Manhole covers and prestressed concrete etc. Hybrid reinforcing materials in the concrete i.e. steel and glass fibers are giving the good results in load carrying capacity, ductility and serviceability [1]. Avinash and suresh [2] tested steel fiber reinforced concrete beams for bending, shear and torsion without web reinforcement. Mechanical properties of fiber reinforced light weight concrete composites studied by perez-pena and mobasher [3]. They have used Polyvinyl Chloride (PVC), Polypropylene (PP) and alkali resistant glass is used as fibers in the concrete. They found that the significant improvement in the cracking strength and load carrying capacity by using the fibers in concrete. Alsayed, Al-Salloum and Almusallam [4] studied the performance of glass fiber reinforced plastic bars as reinforcing materials for concrete. The flexural strength of modified concrete is more compared to conventional concrete. Senthil kumar and Natesan [5] investigated the poly propylene fibers in concrete for the crack reduction. They found that the Polypropylene fibers are very effective in reducing the cracks in the concrete. Karim et al., [6] studied the structural behavior of polymer concrete beams using polyethylene terephthalate (PET) fibers in the concrete. They found that the beams exhibited higher strength and more ductility than conventional concrete beams. M concrete is used for the present study. Modified concrete is prepared with 0.5% increment of HDPE fibers starting from 0 to 6% by volume. Cubes, cylinders and beams are prepared for finding the compressive, split tensile and flexural strengths of both conventional and modified concretes at the ages of 7, 14 and 28days. II. MATERIALS Cement: In these experimental investigations ordinary Portland cement 43 grade used. The chemical composition and physical properties of cement is given in the below table. Properties Fineness (M2/Kg) (Specific Surface) Setting Time (Initial) Setting Time (Final) Sound Ness By Lechatelier By Auto Clave Compressive strength 3 days 7 days 28 days TABLE I PROPERTIES OF CEMENT Test Results 290 150 280 3.0 0.06 30.6 40.2 53.6 Limits as per IS8112-1989 225 min 30 600 10mm 0.8% 23MPa Min 33MPa Min 43MPa Min 25 Fine Aggregate: The size of the aggregate is below 4.75mm. The most important function of the fine aggregate isPDF Image | Behaviour of HDPE Fiber Reinforced Concrete
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