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Influences of fly ash and coir fiber on strength properties of soft soil

Author Affiliations

  • 1Civil Engineering Department, VSSUT, Burla, Odisha, India
  • 2Civil Engineering Department, VSSUT, Burla, Odisha, India
  • 3Civil Engineering Department, VSSUT, Burla, Odisha, India

Res. J. Engineering Sci., Volume 6, Issue (10), Pages 1-9, November,26 (2017)


Civil Engineers are in search of new competitive material, which can be suitable and effectively used to face many challenges that have cropped up with time in the world. The fly ash is one of the waste materials of thermal power stations, a Coir Fiber (CF) is an abundantly available waste material in coastal India. This paper presents the influence of the inclusion of fly ash and coir fiber on strength properties of soft soil. The review is performed on clayey sand(SC), admixed with class C fly ash and reinforced with coir fibers of aspect ratio(l/d=40) and it is exhibited that discrete as well as randomly distributed coir fibers are instrumental in enhancing the bearing capacity of soil. The soil considered here contains varying percentage of fly ash (range from 5- 20% by weight of soil) and the Coir fibers are added at 3% and 5% for investigation of the relative strength gain in terms of unconfined compression and CBR. Using standard Proctor’s maximum density of fly ash and coir fiber, soil was compacted. The present investigation is to evaluate the maximum dry density (MDD), unconfined compressive strength (UCS) and California Bearing Ratio (CBR) of soil utilizing varying percentage of fly ash and coir fiber mixtures. The test outcomes explain that the inclusion of fly ash and coir fibers in soil increases UCS, CBR value and furthermore increase the MDD of soil. The result showed that the optimum percentage of fly ash and coir fiber for achieving maximum strength is 10% fly ash inclusion with 5% coir fiber of the weight of oven-dried soil.


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