Georgiev A.Yoleva A.Djambazov S.2024-07-162024-07-162024-07-162024-07-162017-01-011314-79781314-7471SCOPUS_ID:85025139338https://rlib.uctm.edu/handle/123456789/1187The interest towards introduction of agricultural biomass wastes to porous clay bricks is increasing lately. These pore-forming agents start to ignite during the firing process providing extra thermal energy inside the product and decreasing the required external energy required. Besides this effect, their combustion increases the porosity of the final product resulting in enhanced thermal insulation properties. This paper presents the effect of adding biomasses (wheat straw and husks of sunflower seeds) in quantity of 3,5 mass % and 8 mass % on the physical and thermal properties of clay porous bricks fired at 900°C. The results show increase of the apparent porosity compared to fired clay and decrease of the thermal conductivity of the products. There is a significant positive correlation between the increasing quantity of organic matter and the porosity. This study shows that 5 mass % of wheat straw and 3 mass % of sunflower seeds husks can be used as pore forming agents in bricks production to improve their thermal conductivity and keep acceptable compressive strength.enArticle