Subgrade soil improvement using coir fiber

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Subgrade soil improvement using coir fiber

Subgrade soil improvement using coir fiber

Tonmoy Kumar Brahmachary *, Md. Kamrul Ahsan


  • A few unsoaked and soaked CBR tests were performed on normal soil and soil reinforced with of coir fiber.
  • The coir fiber content was performed highest as 1.75% by anhydrous weight of general soil.
  • Impact of randomly inclusion of coir fiber on CBR value was investigated.
  • CBR test values of strengthened soil were compared with ordinary soil.
  • Optimal coir fiber dosage was found 1% by dry unit weight of soil.


Any construction project depends on the stability of the underlying soil. This is the reason why soil stability is an important factor in the field of construction. In case of unstable soil, the soil stability property must be improved to make construction economical. Over the years, numbers of methods were developed for soil stabilization in particular and ground improvement. Among all fiber-reinforced soil technique is one of the most significant methods of ground improvement. There are some common types of natural fiber namely coir, straw, cotton, sisal, bamboo, palm, sugar cane and jute which are mostly used for soil improvement. These types of natural fibers are willingly available, economical, biodegradable and environment amiable. Fiber generally improves the quality of unstable soil. It increases soil strength and reduces swelling. While performing the investigation soil sample was assembled at its maximum dry density (MDD) analogous to its optimum moisture content (OMC) in the CBR mould including and except coir fiber. The coir fiber content was used as 0.25%, 0.5%, 0.75%, 1.0%, 1.25%, 1.50% and 1.75% by waterless weight of normal soil. It was explored from the test result that the soaked and unsoaked CBR value of soil increases with inclusion of coir fiber dosage up to 1.0%, while for over 1.0% fiber dosage gradual decrement in CBR value was occurred. In addition, it was concluded that the unsoaked and soaked CBR test value enhance up to 17.02% and 7.57%, respectively. Moreover, it was witnessed that the most suitable percentage of coil fiber was 1.0. This research can meet the need of ground improvement having low strength soil.

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To cite this article: Brahmachary TK, Ahsan MK. Subgrade soil improvement using coir fiber. Journal of Advanced Civil Engineering Practice and Research 2017;5:24-29.

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