Influence of cotton bark and rice ball on thermo-physical characteristics of clay bricks

• Main Authors: Modjonda, Modjonda, Kidmo, Dieudonné Kaoga, Sali, Mohammadou, Ngoussandou, Bello Pierre, Raidandi, Danwe
• Format: Conference Proceeding
• Language: English
• Subjects: Adjuvants; Bricks; Clay; Compressive strength; Cotton; Dwellings; Hulls; Mechanical properties; Moisture content; Overheating; Physical properties; Raw materials; Rice; Terracotta; Thermal comfort; Thermal conductivity; Thermodynamic properties; Thermomechanical properties
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0129296

The aim of this work is to contribute to improving thermal comfort in dwellings in the Sudano-Sahelian zone of Cameroon by reducing the temperature gradient between the interior and the exterior of the dwelling during the overheating period. This requires the perfect mastery of the materials used for the construction of the habitat. Terracotta brick seems to meet these criteria. The present work has made it possible to produce fired bricks with interesting thermomechanical properties.The tests carried out on the clays collected in the district of Tchatibali are carried out in order to manufacture specimens. Cotton hulls and rice husks are incorporated into the clay raw material at 0, 2, 4, 6, 8 and 10% to create pores therein. All samples are cooked at 900 ℃ in the laboratory of the Mission for the Promotion of Local Materials in Garoua.Geotechnical, thermal and mechanical properties are determined to assess their potential for use in habitats. The results show that these clays have a water content of 11.90% and a consistency index of 19.10%. These clays are classified as class A-7-6 sandy clays (2). At 6% adjuvants, the results present a thermal conductivity of 0.4 and 0.45 W/m/°K, respectively for rice husks and cotton hulls, and a compressive strength of 20.50 MPa for cotton bark and 20.75 MPa for rice ball. Consequently, the clays collected in the Tchatibali district can be deemed suitable for the manufacture of terracotta bricks which improve thermal comfort in the home.