Abstract: The blast furnace slag and flyash mixtures were used as the foundation fill. The grain size analysis on the mixtures indicates that the fill material is poor graded with the absence of finer grain material. The foundation fill was treated with dynamic compaction as well as the conventional compaction by a vibratory roller. After the treatment, the gradation of the fill materials have significantly improved to the well graded gravel materials. The maximum dry density, optimum moisture and the degree of compaction were obtained by the heavy dynamic penetrometer testing. The average specific gravity of the mixture was obtained from the specific gravity tests on both materials. The code used average specific gravity formula for the mixtures was corrected for the finer grain sized materials.

Key words: Blast Furnace Slags, Fly Ashes, Physical Properties, Soil Treatments