Effect of Bentonite on Permeability of Dune Sand   N. K. Ameta Associate Professor, M. B. M. Engineering College J. N. V. University, Jodhpur, Rajasthan, India Wayal A. S. Senior Lecturer, K. J. Somaiya Polytechnic, Mumbai Presently Research Scholar, M. B. M. Engineering College, J. N. V. University, Jodhpur, Rajasthan, India
			ABSTRACT

A compacted mixture of bentonite with sand has been used to form barrier of fluids, in absence of impervious natural soils. This paper focuses on the permeability behavior of dune sand/bentonite mixtures. Results of laboratory investigations are presented to show the influence of bentonite on permeability of dune sand. One dimensional consolidation and falling head permeability tests were conducted to evaluate permeability at 2%, 4%, 6%, 8% and 10% bentonite content by weight in dune sand. Some of the findings are: The coefficient of consolidation decreases inversely proportional with lower bentonite/dune sand ratios. The coefficient of volume change is more susceptible to changing stresses and is inversely related to it. The permeability of dune sand with bentonite is varied significantly and reduced significantly after addition bentonite. The permeability investigated by falling head permeability and one-dimensional consolidation test are in good agreement.

Keywords: Mixture, Bentonite, Dune sand, Permeability, Laboratory study.

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