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Performance of coir geotextile reinforced subgrade for low volume roads

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Abstract

Reinforcing flexible pavements using different types of geosynthetics is a technique that is widely used to increase the service life, reduce the maintenance costs and, guarantee high performance throughout the service life. This paper presents the insights from combined experimental and numerical analysis conducted on organic soil reinforced with coir geotextiles. A series of small-scale in-box plate load tests were performed to investigate the behavior of coir geotextile reinforced high plastic organic soil under circular loading. Tests were conducted on both homogeneous (sub grade alone) and layered configurations. Two types of commercially available woven coir geotextiles viz. H2M5 and H2M6, were utilized to study the contribution of coir geotextiles when used as reinforcement at the interface of sub-base and subgrade layers in enhancing the strength and stiffness of the low volume road. The primary objective of this exploratory study is to investigate the improvement in the performance of the low volume pavement as a result of the added geotextile reinforcement. The key performance parameters, namely, displacement, stress and strain responses of both reinforced and unreinforced pavement sections are obtained by analyzing the pavement using ABAQUS, which is a software suite for Finite Element Method (FEM) analysis. Test results indicate that the coir geotextile reinforcement substantially improved the performance of high plastic organic subgrade. A maximum reduction of 38% and 24% in vertical strain was observed on top of the subgrade in the case of H2M5 and H2M6 coir geotextile reinforced sections, respectively. Also, a maximum reduction of 30% and 18% in vertical displacement was observed in the case of H2M5 and H2M6 coir reinforced sections, respectively. At an average radial distance of about 1 m from the center of simulated static wheel load, very small displacement and strain value were observed for reinforced sections, relative to the unreinforced sections. Hence, the conclusion is drawn that the H2M5 type of coir geotextile contributes more than the H2M6 type to the structural performance improvement of pavements when used as reinforcement.

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Authors and Affiliations

  1. Department of Civil Engineering, National Institute of Technology, Trichy, Tamil Nadu, 620 015, India

    V. Anusudha, V. Sunitha & Samson Mathew

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  1. V. Anusudha
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  2. V. Sunitha
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  3. Samson Mathew
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Correspondence to V. Anusudha, V. Sunitha or Samson Mathew.

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Peer review under responsibility of Chinese Society of Pavement Engineering.

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Anusudha, V., Sunitha, V. & Mathew, S. Performance of coir geotextile reinforced subgrade for low volume roads. Int. J. Pavement Res. Technol. 14, 213–221 (2021). https://doi.org/10.1007/s42947-020-0325-4

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  • DOI: https://doi.org/10.1007/s42947-020-0325-4

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