International Research Journal of Engineering and Technology (IRJET) Volume: 09 Issue: 06 | Jun 2022
e-ISSN: 2395-0056
www.irjet.net
p-ISSN: 2395-0072
Effect of addition of polypropylene fibers on concrete properties- A Review Anjali Jaglan1, R.R. Singh2 1PhD
Research Scholar, Civil Engineering Department, Punjab Engineering College (Deemed To Be University), Chandigarh, India-160012 2Professor, Civil Engineering Department, Punjab Engineering College (Deemed To Be University), Chandigarh, India-160012 ---------------------------------------------------------------------***--------------------------------------------------------------------The present research work aims to present a review of the Abstract - Concrete is a brittle material having a low tensile strength when compared to its compressive strength. Fiber dispersion in concrete is one of the techniques for improving concrete's structural properties. Polypropylene fiber is a synthetic linear polymer fiber created by polymerizing propylene. Polypropylene fibers are lightweight and have high toughness, strength, and corrosion resistance. Compared to typical steel fibers, polypropylene fiber has a low modulus, density, and monofilament diameter. Like any secondary reinforcement, these fibers keep cracks from spreading by holding the concrete together, preventing cracks from becoming broader or longer. This study reviews the effect of the addition of polypropylene fibers on various concrete properties. Key Words: Concrete, Polypropylene fibers, workability, compressive strength, split tensile strength, etc.
1. INTRODUCTION Concrete is a common construction material in both developed and developing countries. During its service life, a concrete structure may be exposed to various environmental conditions. The durability of a concrete structure is characterized by its ability to resist these exposure conditions without requiring extensive repair or rehabilitation. Concrete has long been thought to be an innately durable material that may last for decades, if not centuries, with little or no care. Concrete's performance is determined by its constituents. Plain concrete is well recognized for being brittle in nature and weak in tension. Concrete's low tensile strength is the most unattractive feature as a brittle material. Therefore, concrete requires reinforcement in order to withstand tensile stresses. Traditionally, this reinforcement is in the form of continuous steel bars put in the concrete structure in the proper positions to sustain the imposed tensile and shear loads. Nowadays, short and discontinuous fibers randomly distributed throughout the concrete member are used as the reinforcing material. Adding fibers to concrete can prevent micro-cracks from forming, leading to gradual failure. Many fibers such as steel, carbon, glass, polypropylene, and natural fibers can be used as reinforcing materials in concrete structures. © 2022, IRJET
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effect of the addition of polypropylene fibers on the concrete properties.
2. POLYPROPYLENE FIBERS Polypropylene fiber is a linear polymer synthetic fiber made from the polymerization of propylene. The characteristics of polypropylene fibers are light weight, high toughness, high strength, and corrosion resistance [1]. Compared to traditional steel fibers, polypropylene fiber has a low modulus, density, and monofilament diameter [2]. 2.1 Advantages of polypropylene fibers
It is a relatively low-cost material.
It possesses high flexural strength.
It has a high moisture resistance.
It is chemically resistant to a wide range of bases and acids.
It has a good fatigue resistance.
It has a high impact strength.
It has good resistance to electricity.
2.2 Need of polypropylene fibers in concrete Polypropylene fibers have a tendency to bind the concrete mix. The addition of these fibers to concrete lowers the rate of bleeding. A slower rate of bleeding implies a slower rate of drying, which means less plastic shrinkage cracking in the concrete. Moreover, polypropylene fibers act as crack arresters in hardened concrete. Like any secondary reinforcement, the fibers tend to prevent cracks from propagating by holding the concrete together, preventing cracks from spreading wider or becoming longer.
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