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Technical Brief

Moisture Desorption Studies on Polymer Hydrated and Vacuum Extruded Bentonite Clay Mat

[+] Author and Article Information
Eric Wooi Kee Loh

Faculty of Built Environment,
Persiaran UTL, BUTL,
Linton University College,
Batu 12,
Mantin 71700, Negeri Sembilan, Malaysia
e-mail: ericdrloh@gmail.com

Devapriya Chitral Wijeyesekera

Faculty of Civil and Environmental Engineering,
Universiti Tun Hussein Onn Malaysia,
Batu Pahat,
Johor 86400, Malaysia
e-mail: dcwijey@gmail.com

Mihaela Anca Ciupala

School of Architecture, Computing and Engineering,
University of East London,
University Way,
London E16 2RD, UK
e-mail: m.a.ciupala@uel.ac.uk

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 28, 2015; final manuscript received July 5, 2016; published online August 9, 2016. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 138(12), 124502 (Aug 09, 2016) (7 pages) Paper No: HT-15-1624; doi: 10.1115/1.4034150 History: Received September 28, 2015; Revised July 05, 2016

Moisture desorption observations from two bentonite clay mats subjected to ten environmental zones with individually different combinations of laboratory-controlled constant temperatures (between 20 °C and 40 °C) and relative humidity (between 15% and 70%) are presented. These laboratory observations are compared with predictions from mathematical models, such as thin-layer drying equations and kinetic drying models proposed by Page, Wang and Singh, and Henderson and Pabis. The quality of fit of these models is assessed using standard error (SE) of estimate, relative percent of error, and coefficient of correlation. The Page model was found to better predict the drying kinetics of the bentonite clay mats for the simulated tropical climates. Critical study on the drying constant and moisture diffusion coefficient helps to assess the efficacy of a polymer to retain moisture and control desorption through water molecule bonding. This is further substantiated with the Guggenheim–Anderson–De Boer (GAB) desorption isotherm model which is presented.

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References

Schroeder, C. , Monjoie, A. , Illing, P. , Dosquet, D. , and Thorez, J. , 2001, “ Testing a Factory-Prehydrated GCL Under Several Conditions,” 8th International Waste Management and Landfill Symposium, CISA, Cagliari, Italy, Vol. 1, pp. 188–196.
Kolstad, D. C. , Benson, C. H. , Edil, T. B. , and Jo, H. Y. , 2004, “ Hydraulic Conductivity of a Dense Prehydrated GCL Permeated With Aggressive Inorganic Solutions,” Geosynth. Int., 11(3), pp. 233–241. [CrossRef]
Di Emidio, G. , Mazzieri, F. , and Van Impe, W. , 2008, “ Hydraulic Conductivity of a Dense Prehydrated GCL: Impact of Free Swell and Swelling Pressure,” 4th European Geosynthetics Conference, Golder Associates, Nottingham, UK, Paper No. 320.
Katsumi, T. , Ishimori, H. , Onikata, M. , and Fukagawa, R. , 2008, “ Long-Term Barrier Performance of Modified Bentonite Materials Against Sodium and Calcium Permeant Solutions,” Geotextiles Geomembranes, 26(1), pp. 14–30. [CrossRef]
Wijeyesekera, D. C. , Loh, E. W. K. , Siti, F. D. , Lim, A. J. M. S. , Zainorabidin, A. B. , and Ciupala, M. A. , 2012, “ Sustainability Study of the Application of Geosynthetic Clay Liners in Hostile and Aggressive Environments,” OIDA Int. J. Sustainable Dev., 5(6), pp. 81–96.
Loh, E. W. K. , and Wijeyesekera, D. C. , 2015, “ Hydraulic Flow Through Engineering Bentonite-Based Containment Barriers,” Am. J. Appl. Sci., 12(11), pp. 785–793. [CrossRef]
Evans, A. A. , and Keey, R. B. , 1975, “ The Moisture Diffusion Coefficient of a Shrinking Clay on Drying,” Chem. Eng. J., 10(1), pp. 127–134. [CrossRef]
Tomas, S. , Skansi, D. , and Sokele, M. , 1993, “ Kinetics of the Clay Roofing Tile Convection Drying,” Drying Technol., 11(6), pp. 1353–1369. [CrossRef]
Sander, A. , Tomas, S. , and Skansi, D. , 1998, “ The Influence of Air Temperature on Effective Diffusion Coefficient of Moisture in the Falling Rate Period,” Drying Technol., 16(7), pp. 1487–1499. [CrossRef]
Sander, A. , Kardum, J. P. , and Skansi, D. , 2001, “ Transport Properties in Drying of Solids,” Chem. Biochem. Eng. Q., 15(3), pp. 131–137.
Sander, A. , Skansi, D. , and Bolf, N. , 2003, “ Heat and Mass Transfer Models in Convection Drying of Clay Slabs,” Ceram. Int., 29(6), pp. 641–653. [CrossRef]
Murugesan, K. , Suresh, H. N. , Seetharamu, K. N. , Narayana, P. A. A. , and Sundararajan, T. , 2001, “ A Theoretical Model of Brick Drying as a Conjugate Problem,” Int. J. Heat Mass Transfer, 44(21), pp. 4075–4086. [CrossRef]
Mihoubi, D. , Zagrouba, F. , and Bellgi, A. , 2002, “ Drying of Clay—I: Material Characteristics,” Drying Technol., 20(2), pp. 465–487. [CrossRef]
Dincer, I. , and Sahin, A. Z. , 2004, “ A New Model for Thermodynamic Analysis of a Drying Process,” Int. J. Heat Mass Transfer, 47(4), pp. 645–652. [CrossRef]
Akpinar, E. K. , and Dincer, I. , 2005, “ Moisture Transfer Models for Slabs Drying,” Int. Commun. Heat Mass Transfer, 32(1), pp. 80–93. [CrossRef]
Chemkhi, S. , Zagrouba, F. , and Bellagi, A. , 2004, “ Thermodynamics of Water Sorption in Clay,” Desalination, 166(1), pp. 393–399. [CrossRef]
Chemkhi, S. , and Zagrouba, F. , 2005, “ Water Diffusion Coefficient in Clay Material From Drying Data,” Desalination, 185(1), pp. 491–498. [CrossRef]
Kanno, T. , Kato, K. , and Yamagata, J. , 1996, “ Moisture Movement Under A Temperature Gradient in Highly Compacted Bentonite,” Eng. Geo., 41(4), pp. 287–300. [CrossRef]
Su, L. , 1997, “ Modeling of Multi-Phase Moisture Transfer and Induced Stress in Drying Clay Bricks,” Applied Clay Science, 12(3), pp. 189–207. [CrossRef]
Moropoulou, A. , Karoglou, M. , Giakoumaki, A. , Krokida, M. K. , Maroulis, Z. B. , and Saravacos, G. D. , 2005, “ Drying Kinetics of Some Building Materials,” Brazilian J. of Chem. Eng., 22(2), pp. 203–208. [CrossRef]
Brunauer, S. , Emmett, P. H. , and Teller, E. , 1938, “ Adsorption of Gases in Multi-Molecular Layers,” J. Am. Chem. Soc., 60(2), pp. 309–319. [CrossRef]
Van den Berg, C. , and Bruin, S. , 1981, “ Water Activity and Its Estimation in Food Systems: Theoretical Aspects,” Water Activity: Influence on Food Quality, L. B. Rockland and G. F. Stewards , eds., Academic Press, New York, pp. 1–61.
Henderson, S. M. , 1952, “ A Basic Concept of Equilibrium Moisture,” Agric. Eng., 33(1), pp. 29–32.
Halsey, G. , 1948, “ Physical Adsorption on Non-Uniform Surfaces,” J. Chem. Phys., 16(10), pp. 931–937. [CrossRef]
Chung, D. S. , and Pfost, H. B. , 1967, “ Adsorption and Desorption of Water Vapour by Cereal Grains and Their Products—Part II: Development of the General Isotherm Equation,” Trans. ASABE, 10(4), pp. 552–555. [CrossRef]
Smith, S. E. , 1947, “ The Sorption of Water Vapour by High Polymers,” J. Am. Chem. Soc., 69(3), pp. 646–651. [CrossRef]
Oswin, C. R. , 1946, “ The Kinetics of Package Life—III: Isotherm,” J. Soc. Chem. Ind., 65(12), pp. 419–421. [CrossRef]
Wang, C. Y. , and Singh, R. P. , 1978, “ A Single Layer Drying Equation for Rough Rice,” ASAE Paper No. 78-3001.
Guarte, R. C. , 1996, “ Modelling the Drying Behaviour of Copra and Development of a Natural Convection Dryer for Production of High Quality Copra in the Philippines,” Ph.D. thesis, Hohenheim University, Stuttgart, Germany.
Jayas, D. S. , Cenkowski, S. , Pabis, S. , and Muir, W. E. , 1991, “ Review of Thin-Layer Drying and Wetting Equations,” Drying Technol., 9(3), pp. 551–588. [CrossRef]
Geankoplis, C. J. , 1993, Transport Processes and Unit Operation, 3rd ed., Prentice-Hall, Englewood Cliffs, NJ.
Brunauer, S. , 1945, The Adsorption of Gases and Vapor, Vol. 1., Princeton Univ. Press, Princeton, NJ.
Mihoubi, D. , and Bellagi, A. , 2006, “ Thermodynamic Analysis of Sorption Isotherms of Bentonite,” J. Chem. Thermodyn., 38(9), pp. 1105–1110. [CrossRef]

Figures

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Fig. 1

Schematic diagram of the environmental chamber and the ancillary equipments for the convective drying: 1, electronic balances (suite of three specimens); 2, temperature controller/data logger; 3, temperature sensor; 4, humidity controller/data logger; 5, humidity sensor; 6, heater; 7, cooler; 8, humidifier; 9, dehumidifier; and 10, wall with insulation

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Fig. 2

Experimental moisture content for the TSA specimen versus time and its comparison with existent mathematical models

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Fig. 3

Influence of thermal environment condition on the drying constant k (TSA specimen)

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Fig. 4

Influence of thermal environment condition on the drying constant k (TSB specimen)

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Fig. 5

Influence of thermal environment condition on the drying constant n (TSA specimen)

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Fig. 6

Influence of thermal environment condition on the drying constant n (TSB specimen)

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Fig. 7

Influence of thermal environment condition on the moisture diffusion coefficient, Deff (TSA specimen)

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Fig. 8

Influence of thermal environment condition on the moisture diffusion coefficient, Deff (TSB specimen)

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Fig. 9

Desorption isotherm of TSA specimen (▴) and TSB specimen (▪) at 20 °C

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Fig. 10

Desorption isotherm of TSA specimen (▴) and TSB specimen (▪) at 30 °C

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Fig. 11

Desorption isotherm of TSA specimen (▴) and TSB specimen (▪) at 40 °C

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