The development trend of building materials science is aimed at energy and resource conservation, as well as the creation of green composites. The search for more sustainable construction materials has led researchers to reconsider ancient techniques, such as earth-based construction materials (EBCMs). Design buildings respectful of comfort and well-being of all while seriously reducing energy used is the challenge to all players in industry construction. Fired clay brick have the advantage of being solid (high strength), inert (resistant to chemical and biological attacks), non-flammable, good thermal and acoustic regulators. This scientific work would achieve optimization of thermal and mechanical properties of fired clay brick through the incorporation of adjuvant (rice hulls) which contribute to the improvement of intrinsic properties. This research provide a solution for sustainable construction materials in Sahelian zones; the use of rice balls as adjuvant is to ameliorate the building energy performance. It has been concluded that the addition of adjuvants (rice hulls) barely influences fired clay brick conductivity, thermal and mechanical properties which range from 3.4 MPa to 5.2 MPa. Thermal conductivity and density are slightly reduced which leads to lighter materials and higher insulation values. The increasing of the heat let us think about the building energy performance. Rice husks are incorporate into the fired clay brick to create pores. Specimens are made with adjuvants using different size cuts of 1000-500 microns, 500-315 microns and 315-125 microns in proportions of 0%, 2%, 4%, 6%, 8% and 10%. The specimens are then fired at respective temperature of 900°C, 1000°C and 1100°C.

building energy performance, thermophysical properties, thermal insulation, material efficiency, sustainable construction materials