Experimental Studies on Strength Performance of Subgrade Soil Mixed with Bottom Ash and Coir Fiber

  • G. Karthikeyan
  • S. Karthic
  • Sreevalsa KolathayarEmail author
Conference paper


The traffic loads on pavements are ultimately transferred to the subgrade and the performance of the pavement largely depends upon properties of sub grade soil. It becomes necessary to stabilize weak soils for infrastructural development such as for the construction of pavements. As the natural resources are depleting, limiting the use of natural resources and enhancing the use of locally available materials and waste materials is very important for sustainable development. The present study aims to evaluate the possible utilization of bottom ash (BA) which is a by-product obtained from thermal power plant, along with natural coir fiber as reinforcing agent for a locally available weak clayey soil in Southern India. Various strength parameters like California Bearing ratio (CBR), unconfined compression strength (UCS), Split tensile strength were estimated for soil-BA-coir fiber mixes in different percentages. A small amount of cement (5%) is also added to promote pozzolanic reaction. It was observed that the engineering properties of the soil depend mainly on the amount of coir and BA as well as curing period. This experimental investigation recommends the use of coir fiber and BA in combined form to get maximum benefits in soil stabilization. The results of experiments are presented and the suitability of using coir fiber and bottom ash are discussed in detail.


Soil subgrade Bottom ash Coir fiber California Bearing Ratio Unconfined Compressive Strength Tensile strength 


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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • G. Karthikeyan
    • 1
  • S. Karthic
    • 1
  • Sreevalsa Kolathayar
    • 1
    Email author
  1. 1.Department of Civil Engineering, Amrita School of EngineeringAmrita Vishwa Vidyapeetham, Amrita UniversityCoimbatoreIndia

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