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Improvement of Bearing Ratio of Clayey Subgrade Using Compacted Flyash Layer

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Abstract

This paper presents a laboratory study on California Bearing Ratio (CBR) of flyash overlying a soft clay bed. Flyash sample (Class F) has been collected from Titagarh Thermal Power Plant situated near Kolkata. The type of soil collected locally is silty clay. Different configurations of soil and flyash overlying the soil have been maintained by varying the thickness ratio (ratio of thickness of flyash to that of clay) in the ratios of 1:2, 1:1 and 2:1. Both Standard Proctor and Modified Proctor compaction tests have been carried out to obtain respective maximum dry density and optimum moisture content to be used for CBR tests. The water contents of soil used in this study are 16, 22, 28, 34 and 40% where 16% is the optimum moisture content of the soil as obtained in Standard Proctor compaction test. Similarly water content of the soil has been kept at 12, 18, 24, 30, 36 and 42% for samples prepared using Modified Proctor energy where 12% is the corresponding optimum moisture content of soil. Improvement of CBR values of composite soil-flyash system has been observed when compacted flyash layer is placed above the compacted soil. Out of three thickness ratios tested, CBR value has been found to be the lowest at thickness ratio of 1:2 and the highest at 2:1. The improvement factor is found to be maximum for highest moulding water content irrespective of thickness ratio and compaction energy. It indicates the effective use of flyash soil composite matrix under worse affected condition of high water content. The paper highlights the nature of improvement of clayey soil when compacted flyash layer has been placed on it with different values of thickness ratio and placement moisture content and compaction energy.

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References

  • Ameta NK, Wayal AS, Puneet H (2013) Stabilization of dune sand with ceramic tile waste as admixture. Am J Eng Res (AJER) 02(09):133–139

    Google Scholar 

  • Bera, A. K. (2010) Effect of pond ash content on engineering properties of fine grained soil, IGC-2010, Mumbai, India pp 16–18

  • Bose B (2012) Geo engineering properties of expansive soil stabilized with fly ash. Electron J Geotech Eng 17:1339–1353

    Google Scholar 

  • Dindorkar N, Shrivastava R (2012) Characteristics of low lime fly ash stabilised with lime and gypsum. In: IPCBEE, vol 28

  • Gedik AG, Lav MA, Lav AH (2008) Utilization of waste foundry sand as pavement sub-base and fill material advances in transportation geotechnics. In: Ellis, Yu, McDowell, Dawson, Thom (eds). Taylor & Francis Group, London, pp 143–148

  • Geliga EA, Ismail DSA (2010) Geotechnical properties of fly ash and its application on soft soil stabilization. UNIMAS E J Civil Eng 1(2):1–6

  • Ghosh A, Dey U (2009) Bearing ratio of reinforced fly ash overlying soft soil and deformation of fly ash. Geotext Geomembr 27(4):313–320

    Article  Google Scholar 

  • Ghosh A, Subbarao C (2007) Strength characteristics of class F fly ash Modified with lime and gypsum. J Geotech Geoenviron Eng 133:757–766

    Article  Google Scholar 

  • Mol BS, Sayida MK (2011) Compaction and strength characteristics of soil composites. In: Proceedings of Indian geotechnical conference, Kochi

  • Okagbue CO (2007) Stabilization of clay using woodash. J Mater Civil Eng 19(1):14–18

    Article  Google Scholar 

  • Prabakar J, Dendorkar N, Morchhale RK (2003) Influence of fly ash on strength behaviour of typical soils. Constr Build Mater 18:263–267

    Article  Google Scholar 

  • Prasad CRV, Sharma RK (2014) Influence of sand and fly ash on clayey soil stabilization. IOSR J Mech Civil Eng (IOSR-JMCE), 36–40

  • Ramakrishan AK, Natarajan K, Ravichandran K (2001) Stabilization of annamalainagar clay with lime-fly ash. Indian Geotech Conf 2001:251–254

    Google Scholar 

  • Sahu BK (2001) International ash utilization symposium. New Delhi, India, p 90

  • Shenbaga RK, Gayathri V (2003) Geotechnical Behavior of fly ash mixed with randomly oriented fibre inclusions. Geotext Geomembr 21(3):123–149

    Article  Google Scholar 

  • Takhelmayum G (2013) Laboratory study on soil stabilization using fly ash mixtures. Int J Eng Sci Innov Technol 2(1):477–482

    Google Scholar 

Download references

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Authors and Affiliations

  1. Department of Civil Engineering, Jadavpur University, Kolkata, 700 032, India

    Ashimanta Sengupta & Sibapriya Mukherjee

  2. Department of Civil Engineering, Indian Institute of Engineering Science & Technology, Shibpur, Howrah, 711 103, India

    Ambarish Ghosh

Authors
  1. Ashimanta Sengupta
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  2. Sibapriya Mukherjee
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  3. Ambarish Ghosh
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Correspondence to Sibapriya Mukherjee.

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Sengupta, A., Mukherjee, S. & Ghosh, A. Improvement of Bearing Ratio of Clayey Subgrade Using Compacted Flyash Layer. Geotech Geol Eng 35, 1885–1894 (2017). https://doi.org/10.1007/s10706-017-0179-y

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  • DOI: https://doi.org/10.1007/s10706-017-0179-y

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