Ferrochrome Slag characterization and its compatibility with Quarry dust in Flexible pavement

Abstract

Exhaustion of locally available materials and increasing hauling charges gained the potential for the exploration of cost-effective alternative materials in the construction industry. Broad endeavours have been made over numerous years on the utilization of industrial waste, yet scant exploration is being done on ferrochrome slag. Ferrochrome slag is an industrial by-product obtained from stainless steel production. Several highway laboratory tests on the characterization of ferrochrome slag are carried out, and the physical and mechanical properties of ferrochrome slag are observed to fulfil MoRTH specifications. Deficiency of fines is observed in the gradation of ferrochrome slag, so quarry dust is incorporated for mechanical stabilization. Ferrochrome slag and quarry dust are blended in different proportions to check the gradation suitability as sub-base and base courses in flexible pavement. Modified Proctor Method of compaction is performed for the ferrochrome slag and quarry dust combinations to carry out the California Bearing Ratio (CBR) test at Maximum Dry Density (MDD) and Optimum Moisture Content (OMC). Studies have shown that the combinations of ferrochrome slag and quarry dust in 70/30 and 60/40 proportions are well graded and have reached the required gradation for use as cement-treated sub-base and base layers in flexible pavement.