International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
Application of Coir Geotextile in Subgrade For Improved Strength And Drainage Condition Of Flexible Pavement Prdeep Verma1, Faraz Khan2 1M.Tech Scholar, Transportation Engineering, Babu Banarasi Das University, Lucknow, India
2Assistant Professor Department of Civil Engineering, Babu Banarasi Das University, Lucknow, India
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Abstract- In areas where the subgrade soil has low bearing
When such soils are exposed to water, they can undergo volume changes, leading to road deterioration and increased maintenance costs. Geotextiles, including coir geotextiles, address these issues effectively. Coir geotextiles act as permeable fabrics that can separate, filter, reinforce, and drain when used in conjunction with soil. They distribute the load over a wider area, thereby enhancing the bearing capacity of the subgrade and reducing settlement. By reinforcing the subgrade, coir geotextiles allow for the reduction of pavement thickness and associated earthwork. They can also serve as a membrane between the subgrade and the granular subbase layer, providing stability and drainage. One of the advantages of coir geotextiles is their organic composition. Coir, derived from coconut husk, is a natural and renewable material composed of lignocellulose. It is resistant to rot, molds, and moisture, eliminating the need for chemical treatment. Coir geotextiles are considered environmentally friendly and have a lower cost compared to synthetic alternatives, making them well-suited for low-cost applications. The lifespan of coir geotextiles within the soil environment is typically four to six years, depending on soil conditions. During this period, they can share the load with the soil and increase the subgrade's load-bearing capacity. Coir geotextiles also serve as effective separators and drainage filters, contributing to improved subgrade strength over time. As the coir geotextiles degrade, the compressed organic skeleton remains in place, acting as a filter cake and maintaining a constant moisture content in the subgrade soil. This residual effect further contributes to the stability of the road.
capacity, such as clay soils, the addition of a suitable granular material can enhance the road's ability to withstand traffic loads. However, when the subgrade soil has a California Bearing Ratio (CBR) value of less than 2%, issues like shear failure and excessive rutting are common. These problems require additional measures to improve the ground conditions.
Traditionally, several methods have been employed to address poor ground conditions, including excavation and replacement of unsuitable material, deep compaction, chemical stabilization, preloading, and the use of polymeric geosynthetics. However, these procedures can be expensive, and their implementation in developing countries like India is limited due to cost constraints and the availability of virgin materials. In this context, natural fiber products like coir geotextiles offer a potential solution. Coir geotextiles can be placed within the soil layers to provide reinforcement and improve the overall performance of the road. The geotextiles act as a separator between the soft clay and the granular material, preventing intermixing and maintaining the stability of the road structure. Studies have been conducted to evaluate the effectiveness of coir geotextiles in different soil conditions. These studies have shown positive results, indicating that coir geotextiles can enhance the bearing capacity and overall performance of rural roads built on soft clay. By using coir geotextiles, it may be possible to avoid or reduce the need for more expensive and resource-intensive methods of ground improvement. However, it is important to note that the use of coir geotextiles is just one of the potential solutions for addressing road infrastructure challenges in India.
In summary, the use of coir geotextiles in road construction offers several advantages, including reinforcement, separation, filtration, drainage, cost-effectiveness, and environmental compatibility. They can improve the performance of rural roads, enhance subgrade stability, and reduce the overall transportation cost.
Key Words- Coir geotextile, Bearing capacity, Subgrade, Rutting, pavement.
1.INTRODUCTION-
2. LITERATURE REVIEW -
The Rural Roads Vision - 2025 aims to provide all-weather road access to all habitations by the year 2025. Engineers frequently encounter the issue of creating roadbeds on or with soils that lack adequate strength to handle wheel loads, either during the construction stage or throughout the life of the pavement. One of the primary challenges in road construction is dealing with weak or unstable soils that lack the necessary strength to support the weight of vehicles.
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Evaluation of Coir Geotextile Mats to Enhance the Poor Subgrade Under Repeated Load for Low-Volume Roads D. Harinder,s. Shankar (2020)-The study concluded that the use of coir geotextile mats proved to be effective in reducing deformation, particularly in morrum soil. Additionally, the results indicated that incorporating coir geotextiles improved the performance and serviceability of
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