International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 11 | Nov 2024
p-ISSN: 2395-0072
www.irjet.net
A review on soil stabilizations using RBI grade-81 .
JAVVAJI BHANU KARTHIK1, 2 Dr.P. BALA KRISHNA, Ph.D.
1M. Tech Student, Department of Civil Engineering, MVR College of Engineering and Technology (autonomous)
paritala, India.
2Associate Professor and Head of the department (HOD), Department of Civil Engineering, MVR College of
Engineering and Technology, (autonomous), paritala, India. ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract This study investigates the use of RBI Grade-81, a natural soil stabilizer, in enhancing the engineering properties of black cotton soil for road construction. Black cotton soil, known for its expansive nature, presents significant challenges in road infrastructure due to its tendency to swell when wet and shrink when dry. This behavior leads to cracks, undulations, and structural damage to pavements, necessitating a sustainable solution that addresses these issues. RBI Grade-81, a proprietary soil stabilization additive, offers an environmentally friendly, cost-effective, and durable alternative to conventional materials like cement and lime. The objectives of this study are multifold: to assess the impact of RBI Grade-81 on the soil's liquid limit, plastic limit, and compaction properties, and to evaluate improvements in the soil's Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR) under both soaked and unsoaked conditions. A series of laboratory tests were conducted on untreated black cotton soil and soil treated with varying percentages of RBI Grade-81 (2%, 4%, 6%, 8%, and 10%). The soil samples were subjected to standard tests such as Liquid Limit (LL), Plastic Limit (PL), UCS, CBR, Free Swell Index (FSI), and Specific Gravity, following Indian Standard (IS) and ASTM procedures. The results indicate that the addition of RBI Grade-81 significantly improves the engineering properties of black cotton soil. The liquid limit of the soil decreased with increasing percentages of RBI Grade-81, showing a reduction in the soil’s swelling potential. Similarly, the plasticity index reduced, indicating enhanced soil workability and a lower susceptibility to moisture variations. The UCS values increased notably, with the highest improvement observed at 6% RBI Grade-81, where the UCS value of the treated soil reached 3.63 kN/m² compared to the untreated soil’s 2.08 kN/m². This increase in compressive strength highlights the stabilizer’s potential to improve the load-bearing capacity of roads built on expansive soils. The CBR test results further demonstrated significant improvements. Under soaked conditions, the CBR value of untreated black cotton soil was 4.84%, while the treated soil with 6% RBI Grade-81 showed a remarkable increase to 132.29%. This improvement is crucial for enhancing the durability and performance of pavements subjected to heavy traffic loads. Additionally, the permeability of the soil reduced, with a decrease in the free swell index, suggesting that RBI Grade-81 helps prevent water infiltration, which is essential for maintaining the stability of pavement layers. In conclusion, RBI Grade-81 offers a promising solution for addressing the challenges associated with black cotton soil in road construction. Its application leads to substantial improvements in soil strength, stability, and load-bearing capacity, while also reducing environmental impact. The study confirms that RBI Grade-81 can effectively reduce construction time, lower maintenance costs, and extend the lifespan of pavements, making it a sustainable and economical alternative to traditional materials. Future research could explore the long-term performance of RBI Grade-81 under various climatic conditions and its applicability to other soil types. Key Words: RBI Grade-81, Black Cotton Soil, Soil Stabilization, Road Construction, Expansive Soils, UCS, CBR, Sustainable Infrastructure.
1. INTRODUCTION The Global road networks are crucial for economic growth, yet the construction of durable, long-lasting pavements is often hindered by the limited availability of traditional construction materials such as cement, aggregates, and bitumen. Additionally, the extraction and processing of these materials contribute significantly to environmental degradation, leading to the depletion of natural resources and increased carbon emissions. The demand for more sustainable alternatives has led researchers to explore natural stabilizers, such as RBI Grade-81, which offer promising benefits in terms of reducing environmental impact while improving the performance of pavement materials.
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