International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 05 | May 2024
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p-ISSN: 2395-0072
COMBINED EFFECT OF STEEL FIBERS AND GROUND GRANULATED BLAST FURNACE SLAG ON CLAYEY SOIL Gokul Nath G S1 Rani V2 1M.Tech. Student 2Associate Professor 1,2Department of Civil Engineering
1,2Marian Engineering College, Trivandrum, India
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Abstract - An important practical part of geotechnical
agents such as lime, cement, fly ash, or ground granulated blast furnace slag (GGBS). These agents alter the soil's properties, enhancing its stability, reducing its susceptibility to erosion, and improving its load-bearing capacity. Soil stabilization is frequently employed in the construction of roads, embankments, foundations, and other civil engineering projects to ensure the long-term integrity of structures built on or with the stabilized soil. Ground granulated blast furnace slag (GGBS), a byproduct of the blast furnace, is mainly composed of silicate and aluminosilicate compounds formed from the molten calcium extracted during the furnace process. Industrial production generates approximately ten to twenty megatons of GGBS each year. Failure to properly utilize or dispose of this significant amount of GGBS can result in environmental pollution and degradation. GGBS serves as an effective soil stabilizing agent, improving soil characteristics. Its properties are similar to those of cement, making GGBS a popular alternative to traditional cement in modern applications. Being a by-product further adds to its appeal.
engineering is the technical improvement of soil. Soil stabilization is a well-known method for the treatment of problematic soils. Its advantages over soil replacement include low cost and fast implementation. To improve the strength and stiffness various cementitious materials are adopted. The stabilizers include Portland cement, lime, quartz, fly ash, and GGBS. In the last few decades, green materials and their applications in the civil engineering infrastructure have been gaining significant attention Unfortunately, these mixtures do not perform well under tensile load because soil-cement materials are brittle. Ground granulated blast furnace slag (GGBFS) is a byproduct of the manufacture of iron. GGBS material is also used as a substitute for cement in concrete mixtures and in soil stabilization. The Fiber inclusion in expansive clays shows significant enhancement in swell-shrink behaviour and in the prevention of tensile cracks in soil. The study aims to find the combined effect of steel Fibers and Ground Granulated Blast Furnace Slag (GGBS) on clayey soil. The effect of variation in the percentage content of steel fiber (0.5%, 0.75%, 1%) and different bend angles of steel fibers (90,120,150,180 degrees) and percentage of GGBS was experimentally investigated. The strength of the soil is tested at the 7th, 14th and 28th day using the Unconfined Compressive Strength Test (UCS) and Split tensile strength (STS) test. It was found that 30% GGBS content was the optimum content for the soil and as the fiber content and curing period increase the UCS and STS also increase. UCS and STS of Soil-GGBS-Steel fiber mix with Steel fiber having 120 degrees show maximum Strength compared with other fiber bend angles.
Soil exhibits inherent weakness in tension but possesses significant strength in compression, a fundamental characteristic influencing its behaviour in engineering applications. Similar to steel reinforcement in concrete, the addition of fibers offers tensile reinforcement to the soil, mitigating its inherent weakness and enhancing overall stability. In non-cementitious soils, strength is provided by the interaction between the soil and fiber surfaces. In cementitious soils, the cohesive properties of cementitious materials combined with surface fiber interactions play a role in soil strength. Integrating fibers into soil systems yields numerous advantages, including the reduction of tensile crack development, minimization of soil deformations, and enhancement of shear strength and bearing capacity. By strategically placing fibers within the soil matrix, the material gains resistance against tensile loads, thereby improving its overall structural integrity and performance. This study aims to analyse the combined effect of steel fibers and GGBS on soil strength characteristics.
Keywords: Steel Fiber, GGBS, Split tensile strength
1. INTRODUCTION Ground improvement is a widely used technique for enhancing soil conditions. Soil stabilization involves modifying the physical and chemical properties of soil to increase its strength, durability, and overall performance. Soil stabilization aims to render the soil suitable for construction, especially in regions where the natural soil may not possess the required engineering characteristics. Various techniques are used for soil stabilization, including the incorporation of stabilizing
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Unconfined compressive strength characteristics of GGBS and lime was studied by Pai et al. [1] in 2019. UCS and CBR were done on different proportions of GGBS and
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