International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 04 | Apr 2023
p-ISSN: 2395-0072
www.irjet.net
Enhancing Compressive and Flexural Strength of High Strength Concrete using Steel and Polypropylene Fibers Er. Mandeep Kaur1, Dr. Harpal Singh2, Dr. Harvinder Singh3 1Assistant Professor, Civil Engineering Department, GNDEC, Ludhiana, Punjab 2 Professor, Civil Engineering Department, GNDEC, Ludhiana, Punjab
3Professor, Civil Engineering Department, GNDEC, Ludhiana, Punjab ---------------------------------------------------------------------***--------------------------------------------------------------------proportion and workmanship, quality control at the site, Abstract - High strength concrete (HSC) is a key material
used in construction for its superior mechanical properties. In recent years, the addition of fibers to HSC has been shown to further improve its performance. This study aims to investigate the effect of using steel fiber in proportions of 0.5%, 1%, and 1.5%, and polypropylene fiber in proportions of 0.25%, 0.50%, 0.75%, and 1% on the compressive and flexural strength of HSC. The research methodology involves preparing HSC specimens with varying fiber content and subjecting them to compressive and flexural strength tests. The results show that the addition of steel fibers improves the compressive and flexural strength of HSC. Moreover, the increase in steel fiber content leads to an increase in the strength of HSC. Similarly, the addition of polypropylene fibers enhances the flexural strength of HSC. The study also demonstrates that the combined use of steel and polypropylene fibers further enhances the mechanical properties of HSC. The findings of this study can be useful for designing HSC structures with improved mechanical properties. Key Words: High strength concrete, compressive strength, flexural strength, steel fibre, polypropylene fibre. 1. INTRODUCTION
Concrete is a widely used construction material due to its good compressive and flexural strengths, durability, and low cost. It is an engineered material that can satisfy various performance specifications and is produced in large quantities worldwide. Strength and durability are the key parameters to be considered while discussing concrete, and the choice of cement type significantly affects these parameters. The development of concrete can be divided into four stages - normal strength concrete, high strength concrete, high-performance concrete, and triple blended concrete. In the context of concrete, it is crucial to consider both its strength (ability to bear load) and durability (resistance to deteriorating agents). These agents can be chemical, such as sulphates, chlorides, CO2, acids, or mechanical, like abrasion, impact, and temperature. To ensure strong and durable concrete structures, several steps are required, including structural design and detailing, proper mix
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and the selection of appropriate concrete ingredients. The type of cement used is one such ingredient that plays a significant role in determining the strength and durability of concrete. Depending on the conditions in which a concrete structure will be used, it may be subjected to varying levels of load and exposure. To meet the necessary performance standards, cements with varying strength and durability characteristics may be necessary. Concrete development can be categorized into four stages. The first stage involved normal strength concrete (NSC), which consists of four primary components, namely cement, water, fine aggregates, and coarse aggregates. As the demand for higher strength concrete arose due to the construction of high-rise buildings and long-span bridges, the second stage was the development of high strength concrete (HSC) with inherent higher compressive strength. However, it was later realized that high compressive strength was not the only crucial factor for concrete mix design. Other parameters, such as durability, permeability, and workability, were also essential. This realization led to the development of high-performance concrete (HPC) at the end of the last century. The final stage aimed to maximize all these properties in an economical and environmentally friendly way, which introduced the concept of triple blended concretes.
2. LITERATURE REVIEW In order to fulfil the aims and objectives of the present study following literatures have been reviewed. Akbari et al. (2018) conducted a research study on the effects of polypropylene and steel fibers on the mechanical properties and durability of high-strength concrete. The study involved preparing concrete mixes with different fiber contents and testing their mechanical properties and durability characteristics. The results showed that the addition of both polypropylene and steel fibers improved the mechanical properties of high-strength concrete. However, the increase in fiber content had a greater effect on the mechanical properties of polypropylene fiber reinforced concrete (PFRC) as compared to steel fiber reinforced concrete (SFRC).
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