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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

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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