A study was undertaken to investigate the effects of a byproduct of oxy-acetylene gas welding, carbide waste (CW) on the engineering properties of Makurdi shale blended with 0 to 8 % of CW for use in brick production. Atterberg limits and specific gravity of shale blended with CW were determined. Compressive strength and water absorption tests were conducted on triplicate cube specimens of each admixture which were fired to 800 o C. In addition, X-ray fluorescence tests were performed on the shale and CW. Results showed that Makurdi shale comprise mainly of silica and alumina while CW was essentially calcium oxide. The results suggested that 4 % CW mix was suitable to stabilize the shale. The study also showed that heat treatment of Makurdi shale and Makurdi shale : CW admixtures yielded bricks of good quality.