TITLE:
Thermal Characteristics of Earth Blocks Stabilized by Rice Husks
AUTHORS:
Mbairangone Samson, Ntamack Guy Edgar, Bianzeube Tikri, Tsopmo Fabien Akana, Ouanmini Bobet
KEYWORDS:
Thermal Conductivity, Bricks, Mixtures, Fiber Reinforced Material, Thermal Confort
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.13 No.10,
October
30,
2023
ABSTRACT: The objective of this study is to
determine the thermal characteristics of bricks produced from clay soils in
Chad using the asymmetric plane method. Indeed, in Sahelian countries like
Chad, temperature variations are excessive. The study of the thermal behavior
of a recyclable local material with low environmental impact could not only
improve thermal comfort in homes, but also help mitigate the effects of climate
change. It is in this context that this study is envisaged. Before carrying out
these measurements, we first produced different formulations of soil blocks 0%,
1% 1.5%, 2% and 2.5% by mass of rice husks (1.25 mm sieve refusal). Brick
specimens of dimensions 10 cm × 10 cm × 1 cm were developed at 0 day, 7 days
and 14 days of maturation of the formulated pastes. After, those bricks were
submitted after drying to the measurements of various thermal parameters: in
particular the conductivity, the effusivity, the volumetric capacity and the diffusivity.
The obtained results show that the addition of rice husks to clay soils
improves conductivity by 13% to 49%, effusivity by 19% to 24%, volumetric
capacity by 23% to 27%, and diffusivity by 47% to 58% for the Moundou soils,
depending on the maturation period. For the N’Djamena soil, these thermal
characteristics are improved from 11% to 38%, from 11% to 13%, from 40% to 47%
and from 39% to 40% respectively.