Utilization of agricultural residues (wanted and unwanted) as alternative materials for fossil fuel is of interest due to its environmental friendliness. This paper is aimed to study these materials response to load during densification. Sorghum and Castor stovers grounds were obtained using hammer mill. Different particle sizes were obtained by using three (2 mm, 3 mm, 5 mm) screens in the mill. The grounds were densified using 30000 kN Universal Testing Machine (UTM) model SF300-2041 at three levels of moisture contents and three levels of temperature. The results of the investigation revealed that the highest unit density of castor stover was 1.169 kg/m3 while that of the sorghum was determined to be 1.188 kg/m3. There were significant decreases in the unit density as days of storage increases.
Key words: Constitutive, densification, biomass, sorghum stover