TITLE:
Thermal Conductivity of Compressed Earth Bricks Strengthening by Shea Butter Wastes with Cement
AUTHORS:
Herve Goure Doubi, Alfred Niamien Kouamé, Léon Koffi Konan, Monique Tognonvi, Samuel Oyetola
KEYWORDS:
Lateritic Clay, Shea Meal, Compressed Earth Brick (CEB), Thermal Conductivity and Eco-Materials
JOURNAL NAME:
Materials Sciences and Applications,
Vol.8 No.12,
November
7,
2017
ABSTRACT: Currently,
in a context of sustainable development, the economic and environmental challenges incite, to valorize local materials
such as clays and agro-industrial
waste. It is in this approach that a new category of compressed earth bricks (BTC)
stabilized with shea meal (TK) and cement was proposed. The purpose of this paper
is to investigate the effect of shea meal rate on the thermal conductivity properties
of cement stabilized earth bricks. A lateritic clay (Lat) mainly composed of kaolinite
(38.44%), quartz (24.94%), goethite (12.28%), hematite (4.44%) and illite (19.9%)
was used to make bricks. Different mix designs made up of lateritic clay and 5%
cement were studied. The shea meal is added as a partial lateritic clay replacement
in different proportions. The thermal conductivity was determined by hot disk method
and correlated to both porosity and density of elaborated materials. The results
obtained show that the thermal conductivity and density of bricks decrease respectively
from 0.72 W·m-1·K-1 to 0.52 W·m-1·K-1 and from 2.77 g·cm-3 to 2.52 g·cm-3. The presence of shea
meal within the material generates pore formation, which may partly explain the
improvement of the thermal insulation properties. A positive correlation was noted
between density and thermal conductivity of these materials.