Characterization of two natural zeolites for geotechnical and geoenvironmental applications.

This paper reports the findings of experimental studies on two natural zeolitic soils. Engineering properties (e.g., grain size, specific gravity, compressibility, hydraulic conductivity, swelling behavior and shear strength) were determined in order to assess their suitability for geotechnical and geoenvironmental applications. The two zeolite-rich tuff samples investigated were mainly composed of clinoptilolite. The results show that the cation exchange capacities are 60.5 and 57.2 mEq/100 g, which are below the theoretical reported values. Compression index values obtained reveal that the zeolitic soils are not highly compressible. The modified free swell indexes of the zeolitic samples are around 2.0, suggesting that they have low swelling potential. The drained residual friction angles indicate that the zeolitic soils have relatively high internal friction angles (34° and 36.5° for Z-1 and Z-2, respectively). Based on the results obtained, it was concluded that zeolites are mechanically stable materials that are suitable for embankment materials and landfill liner applications.

[1]  Bruce Velde,et al.  Introduction to clay minerals , 1992 .

[2]  H. Koyuncu,et al.  Use of natural zeolites as a landfill liner , 2003, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[3]  Yu-Hsing Wang,et al.  Specific surface: determination and relevance , 2002 .

[4]  R. Bowman,et al.  Sorption of Nonpolar Organic Compounds, Inorganic Cations, and Inorganic Oxyanions by Surfactant-Modified Zeolites , 1995 .

[5]  P. Jacobs,et al.  Concept of subaqueous capping of contaminated sediments with active barrier systems (ABS) using natural and modified zeolites , 1999 .

[6]  A. Kaya,et al.  Comparison of Methods for Determining Specific Surface Area of Soils , 2006 .

[7]  Ravi Naidu,et al.  Permeable reactive barrier for groundwater remediation , 2008 .

[8]  Guy T. Houlsby,et al.  Theory and practice of the fall cone test , 2001 .

[9]  Kamil Kayabali,et al.  Engineering aspects of a novel landfill liner material: bentonite-amended natural zeolite , 1997 .

[10]  G. Stevens,et al.  A Natural Zeolite Permeable Reactive Barrier to Treat Heavy-Metal Contaminated Waters in Antarctica: Kinetic and Fixed-bed Studies , 2006 .

[11]  A. B. Cleaves,et al.  Geology In Engineering , 1955 .

[12]  Abidin Kaya,et al.  Utilization of bentonite-embedded zeolite as clay liner , 2004 .

[13]  H. B. Seed,et al.  Prediction of Swelling Potential for Compacted Clays , 1962 .

[14]  Bruce Velde,et al.  Introduction to clay minerals: chemistry, origins, uses and environmental significance. , 1992 .

[15]  P. Alvarez,et al.  Heavy metal removal with Mexican clinoptilolite: multi-component ionic exchange. , 2001, Water research.

[16]  I. Yilmaz.  Indirect estimation of the swelling percent and a new classification of soils depending on liquid limit and cation exchange capacity , 2006 .

[17]  L. Bjerrum,et al.  Comparison of shear strength characteristics of normally consolidated clays , 1960 .

[18]  N. Miura,et al.  Mechanisms Controlling the Undrained Strength Behavior of Remolded Ariake Marine Clays , 2002 .

[19]  Sven Hansbo,et al.  A new approach to the determination of the shear strength of clay by the fall-cone test , 1957 .

[20]  D. V. D. Merwe,et al.  The prediction of heave from the plasticity index and percentage clay fraction of soils , 1964 .

[21]  T. Sitharam,et al.  Modified Free Swell Index for Clays , 1987 .

[22]  E. Teller,et al.  ADSORPTION OF GASES IN MULTIMOLECULAR LAYERS , 1938 .