Laboratory shear strength studies of soil admixed with GGBS and dolomite

Dolomite, a sedimentary carbonate rock primarily composed of calcium magnesium carbonate, and GGBS (Ground Granulated Blast Furnace Slag), a by-product of iron production, are explored as potential enhancements for soil composition in geotechnical engineering. This study aims to effectively reuse these materials by partially replacing loose sand in foundation beds for substructures. The existing soil is partially replaced with varying proportions of Dolomite and GGBS. A series of laboratory tests are carried out to evaluate the performance of the soil partially replaced with these materials. The engineering assessment includes particle size distribution, particle density, and compaction properties. Shear strength and load carrying properties of Dolomite and GGBS in combination are studied through large-scale direct shear and plate load tests respectively. This initial work revealed that calcined dolomite-GGBS blends are practical and are an effective option for soil stabilization. It is observed that addition of 25% of GGBS and 12% of Dolomite by weight helps to improve the shear strength properties of soil. The results obtained from this study can be used to establish a basis for the practical use of Dolomite and GGBS in geotechnical applications.