International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 12 | Dec 2024
p-ISSN: 2395-0072
www.irjet.net
Strength and Durability of characteristics of Fiber Reinforced selfCompaction Concrete BHUKYA ANIL, Mrs. G. SAI SHRUTHI 1
M. Tech Scholar, Department of Civil Engineering, Siddhartha Institute of Technology and Sciences (SITS), Hyderabad, India. 2 Assistant Professor, Department of Civil Engineering, Siddhartha Institute of Technology and Sciences (SITS), Hyderabad, India ---------------------------------------------------------------------------***--------------------------------------------------------------------Abstract Self-Compacting Concrete (SCC) addresses the challenges of poor compaction in traditional concrete, offering superior flowability without mechanical vibration. However, SCC’s higher cost, due to superplasticizers and high cement content, can be mitigated using Supplementary Cementitious Materials (SCMs) like fly ash and silica fume. SCMs improve the mechanical strength and durability of concrete by refining its pore structure. Ternary blended concrete (TBC), combining two SCMs as partial cement replacements, optimizes these benefits while addressing individual SCM limitations. Despite its advantages, SCC has poor tensile strength, impact resistance, and brittleness. Adding glass fibers, which enhance mechanical properties and reduce shrinkage cracks, mitigates these issues. This study evaluated the fresh, mechanical, and durability properties of TBC blends and glass fiber-reinforced SCC. Among the tested blends, TBC9, comprising 70% Ordinary Portland Cement, 20% fly ash, and 10% silica fume, demonstrated superior mechanical and durability properties. Introducing alkali-resistant glass fibres to TBC9 improved splitting tensile strength by 17% and increased energy absorption, though higher fiber content reduced compressive strength. Overall, the optimal TBC9 blend with glass fibers enhanced SCC’s tensile and impact strengths while maintaining workability and durability. These findings highlight the potential of TBC and fiber reinforcement to advance SCC applications in construction. Key Words: Self-Compacting Concrete (SCC), Ternary Blended Concrete (TBC), Supplementary Cementitious Materials (SCMs), Glass Fiber, Durability, Mechanical Properties, Workability.
1.INTRODUCTION Self-Compacting Concrete (SCC) is an innovative type of concrete that flows under its own weight without requiring mechanical vibration, ensuring uniform compaction even in heavily reinforced or complex structural elements. Introduced in Japan during the late 1980s to address challenges such as poor compaction and labor shortages, SCC has gained prominence worldwide due to its ease of placement and enhanced durability. SCC's ability to flow through congested reinforcement zones without segregation is attributed to its unique mix design, which incorporates a higher percentage of fine aggregate relative to coarse aggregate [1]. The mix design is further optimized using superplasticizers and viscositymodifying agents to achieve filling ability, passing ability, and segregation resistance [2]. Although SCC offers several advantages, such as reduced noise pollution during placement and suitability for intricate architectural structures, its high cementitious content contributes to increased costs [3]. Supplementary Cementitious Materials (SCMs) like fly ash and silica fume are often used to partially replace cement, reducing costs and improving durability. Fly ash, a by-product of coal combustion, and silica fume, derived from the silicon industry, contribute to pore refinement, strength enhancement, and environmental sustainability [4, 5,6]. Additionally, the inclusion of fibers, such as alkali-resistant glass fibers, addresses SCC’s inherent brittleness, low tensile strength, and poor impact resistance. These fibers improve mechanical properties and restrict crack propagation but must be optimally dosed to maintain SCC's workability [6,7,8]. This study investigates the formulation of ternary blended SCC incorporating SCMs and fibers to improve the material's mechanical and durability properties while minimizing costs and addressing environmental concerns [9,10].
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