Authors
1 Civil Engineering Department , University of Technology, Iraq,
2 Civil Engineering Dep., University of Technology, Baghdad, Iraq.
Abstract
This paper investigates the impact of the fly Ash addition on the Geotechnical properties of soft soil as well as chooses the optimum percentage added of fly ash. To understand the behavior of fly ash mixed with soil, a number of laboratory experiments testing conducted on clayey soil-fly ash mixture in several percentages (5,10,15,20,25, and 30%) as Atterberg test, Specific gravity test, compaction test, California Bearing Ratio (C.B.R) Test, Unconfined Compressive Strength (UCS) Test, Consolidation Test. Test results indicate rising in plastic limit and liquid limit as fly ash adding. Specific gravity decreased essentially by adding fly ash. Whereas there was falling on the Dry unit weight value with the contract to the decreasing in the water content. The CBR and UCS values were increased with increasing fly ash content. 20% was the optimum fly Ash content. This study also benefits the effective use of fly ash and thus a cost-effective method for improving the soil properties.
Keywords
[2] F.H. Rahil, “Improvement of soft clay underneath a railway track model using stone columns technique,” PhD. Thesis, Building & Construction Dept., Univ. of Technology, Baghdad, Iraq, 2007.
[3] A. Reys, and M. Pando, “Evaluation of CFBC fly ash for improvement of soft clays,” World of Coal Ash, Covington, Vol. 7, pp. 1- 13 , 2007.
[4] A. Yasen, B.S. Albusoda and M.J.A. Al-Mosawe. “Bearing capacity of shallow footing on soft clay improved by compacted fly ash,” Journal of Engineering, Vol. 17, No. 6, pp. 1473–1482, 2011.
[5] S.N. Kumr, S.K. Swain and U.C. Saho, “Stabilization of a clayey soil with fly ash and lime: a micro level investigation,” Geotechnical and Geological Engineering, Vol. 30, No. 5, pp.1197–1205, 2012.
[6] M. A. Ozdmir, “Improvement in bearing capacity of a soft soil by addition of fly ash,” Procedia Engineering, Vol. 143, pp. 498–505, 2016.
[7] B. Virun and A.S. Wyal, “Use of fly ash and lime for stabilization of soft soil,” Electronic Journal of Geotechnical Engineering, Vol. 21, No.18, pp. 6235-6246, 2016.
[8] K. Tenku, A. Sakia and B. Das “Effect of Fly-ash on Strength Behavior of Clayey Soil,” International Research Journal of Engineering and Technology, Vol. 4, No. 7, pp. 2007 -2017 , 2016.
[9] Standard Specfication for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete, ASTM C618, 2012.
[10] U.P. Nawgamuwa, and D.L. Pradsad, “Improving soils of low cbr with fly ash for road applications,” The 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul, pp. 3393-3396, 2017.
[12] V. Kshetij, A. Metra, D. Ssgar, M. Feyaz, and R. Komar, “A Review study of effect of fly ash on engineering properties of soil,” International Research Journal of Engineering and Technology, Vol. 4, pp.1363 -1366, 2017.
[13] K.B. Monyca, and S. Rdrigo, “Geotechnical properties of fly and bottom ash mixtures for use in highway embankments,” Journal of geotechnical and geoenviromental engineering. No.113, pp.914-924. 2005.
[14] R. Satyindra, R.K. Yidav, S.S. Rajpot, and R.K. Yadav, “Effect of fly ash on geotechnical characteristics of black cotton soil,” International Journal for Innovative Research in Science and Technology, Vol. 2, No.3, pp. 9 -13, 2015.
[15] D. Tanaya, and S. Kumar, “Effect of fly ash on geotechnical properties of local soil-fly ash mixed samples,” International Journal of Research in Engineering and Technology, Vol. 3, No. 5, pp. 507–516, 2014.
[16] S. Aykut, T.B. Edil, M.S. Shafique, H.A. Acosta, and C.H. Benson. “Soft subgrades’ stabilization by using various fly ashes resources,” Conservation and Recycling, Vol. 46, No. 4, pp. 365–376, 2006.
[17] B.Kumar, N. Niranjan , M.A. Kumar, “Soil Stabilization with fly ash and industrial waste,” International Research Journal of Engineering and Technology, Vol. 2, No. 2, pp.198-204, 2016.
[18] A. Saeid, A. Chegenizadeh and H. Nikraz, “Laboratory investigation on the effect of fly ash on the compressibility of soil,” The International Conference on Civil and Architectural Applications, Phuket, 2012.
[19] B. A. Mir, and A. Sridharan, “Volume change behavior of clayey soil–fly ash mixtures,” International Journal of Geotechnical Engineering, Vol. 8, No.1, pp. 72–83, 2014
)
