Research Journal of Applied Sciences, Engineering and Technology 12(3): 304!311, 2016
DOI: 10.19026/rjaset.12.2337
ISSN: 2040!7459; e!ISSN: 2040!7467
© 2016, Maxwell Scientific Publication Corp.
Submitted: August 8, 2015 Accepted: September 3, 2015 Published: February 05, 2016
Youssef Maaloufa, LEME, Université Mohamed V!Agdal, EST Salé, 227 Avenue Prince Héritier Sidi
Mohammed Salé, Maroc
This work is licensed under a Creative Commons Attribution 4.0 International License (URL: http://creativecommons.org/licenses/by/4.0/).
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Youssef Maaloufa, Soumia Mounir, Abdelhamid Khabbazi and Jalal Kettar
LEME, Université Mohamed V!Agdal, EST Salé, 227 Avenue Prince Héritier Sidi
Mohammed Salé, Maroc
# Insulation of building envelope has become a necessity in order to reduce the energy cost, that's why, we
proceeded in this study to develop materials using clay and expanded perlite by doing several studies: the first
concerns the variation of volume fraction on expanded perlite and the effect of the calcination on the thermal
properties of the composite clay!expanded perlite. The second is the study of the distribution of temperature inside
walls composed from the composite clay!expanded perlite. In order to achieve the results wanted, this study has
been divided on several steps among them the determination of the kind of clay by means of X!ray diffraction. The
results show that the clay sample is mainly made up of Illite/muscovite. Then the characterization of thermal
properties of clay!expanded perlite before and after calcination. The third step, is the comparison of the
experimental results with analytical models of equivalent thermal conductivity. The results show that the thermal
conductivity decreases by adding expended perlite and calicination from 0.51(clay alone) to 0.258 (clay!100%
expanded perlite) (W/m/K). Also, the calcination decreases the depth of heat flow diffusion by 5 cm and retards the
diffusion of heat flow.
$% Calcination, clay!expanded perlite, flash method, hot plate method, theoretical model, thermal
conductivity, walls
!&’(!’&
An improved performance material such as light
weight, thermal conductivity, storage ... requires the
development of new composite materials. The purpose
of this study is to improve the thermal properties and the
lightness of the clay by combining it with expanded
perlite. That's why authors try in this study to improve
the insulation of construction materials by combining
clay with granular expanded perlite. Also the block clay!
expanded perlite was calcinated in a tunnel stove in
order to see the effect of calcination on insulating the
composite material clay!expanded perlite.
A literature study on insulation building materials
and expanded perlite was investigated so as to realize
this study such as the work of Zukowski and Haese
(2010) concerning the investigation of the effective
thermal properties of a modern vertically perforated
masonry unit filled with perlite insulation. Another for
Gandage et al. (2013) determining the thermal
properties of a concrete bounded with perlite. another
for Abrouki (2013) concerning the characteristics of
perlite in Nador city: Investigation of the basis for
catalytic activity of expanded Perlite in Knoevnagel
condensation. Also a lot of work have done on clay such
as the work of concerning the study of the effect of cork
on the thermal properties of the composite clay!cork
(Mounir et al., 2014; Muñoz et al., 2013) which object
is the improvement of the thermal transmittance of
single!brick walls of clay bricks lightened with paper
pulp. Another for Mohsen and El!Maghraby (2010)
Characterizing different type of clay taken from
different area in Saudia Arabia.
In the present work, we aim to improve the thermal
properties of the material Illite clay by combining it with
granular expanded perlite and studying the effect of
calcination on the thermal properties. The thermal
characterization of the materials is conducted by the use
of the recent asymmetrical Hot Plate (Bouchair, 2008;
Jannot et al., 2010; Lin et al., 2014; Yves, 2011) and
Flash methods (Degiovanni et al., 1996, 1979; Parker
et al., 1961). The effect of the variation of the volume
fraction of expanded perlite and calcination on the
thermal properties of the brick is also studied. A
comparison of thermal properties between the blocks of
clay!expanded perlite before and after calcinations was
conducted to identify the best energy efficient
clay/expanded perlite.
Perlite is a general term for a glassy, volcanic and
rhyolitic rock which will expand when quickly heated to