International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 05 | May 2025
p-ISSN: 2395-0072
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Enhancing the Engineering Properties for Stabilizing Soil Bibek Bhandari Undergraduate Student, Civil Engineering Department Oxford College of Engineering and Management, Nepal ---------------------------------------------------------------------***--------------------------------------------------------------------2. LITERATURE REVIEW Abstract - Soil stabilization is a crucial process in geotechnical engineering, significantly enhancing the strength, durability, and workability of soil used in construction. This study investigates the effect of using fly ash as a stabilizing agent in soil to improve its engineering properties. The research involved collecting soil samples from a depth of 18 inches and mixing them with fly ash in different proportions (0%, 7%, 14%, 21%, and 28%). A series of laboratory tests, including Specific Gravity Test, Standard Proctor Test, Unconfined Compression Strength (UCS) Test, and California Bearing Ratio (CBR) Test, were conducted to determine the optimum percentage of fly ash that enhances soil strength and stability. The results indicate that 21% fly ash addition yielded the highest compressive strength (412 kN/m²) and optimal CBR value (6.76%), making it the most suitable mix for soil stabilization. This research confirms that fly ash is a viable solution for improving soil performance while simultaneously contributing to sustainable construction by utilizing industrial by-products.
The concept of soil stabilization through the use of industrial waste materials has been extensively explored in past studies. Researchers have widely acknowledged the value of fly ash due to its abundant availability, cost-effectiveness, and positive impact on the environment. Fly ash serves as a supplementary cementitious material that, upon mixing with soil, undergoes a pozzolanic reaction leading to the formation of calcium silicate hydrates, which improve the soil’s binding characteristics. Senol et.al (2002) emphasized that fly ash, especially Class F type, significantly improves the strength and durability of soft soils when used in appropriate quantities [5]. Ji-ru & Xing (2002) highlighted that combining fly ash with lime yields even better stabilization results, particularly for expansive soils [6]. Furthermore, studies by Zha et.al (2008) demonstrated that fly ash reduces the plasticity index and improves the workability of clayey soils [7].
3. OBJECTIVES OF THE WORK
Key Words: Soil Stabilization, Fly Ash, California Bearing Ratio, Standard Proctor Test, Unconfined Compression Strength, Sustainable Construction
The primary objective of the research was to assess and enhance the engineering behavior of natural soil using fly ash as a stabilizing additive.
1. INTRODUCTION Soil is a fundamental element in civil engineering, forming the foundation of roads, buildings, bridges, and other infrastructure projects [1]. However, its natural properties— such as swelling, shrinkage, and low bearing capacity—can significantly affect structural stability. Soil stabilization techniques are widely adopted to address these issues by improving the mechanical and physical characteristics of soil [2]. Among various soil stabilizing materials, fly ash has gained prominence due to its availability, cost-effectiveness, and environmental benefits [3]. Fly ash is a fine by-product of coal combustion, often utilized as an additive to improve soil cohesion, reduce permeability, and increase strength [4]. This research aims to evaluate the effect of different proportions of fly ash on soil stability, with a particular focus on unconfined compression strength UCS and CBR values. By determining the optimal percentage of fly ash for stabilization, this study seeks to provide a sustainable and effective approach to improving soil quality in construction applications.
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To determine the optimal percentage of fly ash that offers the highest strength and stability.
To analyze the effect of fly ash on properties such as specific gravity, moisture content, dry density, compressive strength, and bearing capacity.
To contribute to sustainable engineering by utilizing industrial by-products in civil infrastructure.
4. METHODOLOGY The research commenced with an extensive theoretical review, aimed at understanding various soil stabilization techniques and the role of fly ash in modifying soil behavior. Multiple sources including academic journals, dissertations, engineering standards, and textbooks were studied to acquire the foundational knowledge necessary for the experiments. For practical experimentation, soil samples were collected from a depth of 18 inches below the surface using manual excavation tools. This depth was chosen to obtain
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