Improving concrete durability utilizing industrial waste products

This paper presents results of a study conducted to evaluate the mechanical properties and durability characteristics of concrete specimens prepared with the combination of industrial waste products, namely silica fume, fly ash and electric arc furnace dust (EAFD). The supplementary cementing materials, namely silica fume and fly ash, were utilized to enhance the concrete durability while EAFD was used as a retarder. The mechanical properties, such as compressive strength, drying shrinkage, initial and final setting time, and slump retention were determined. The durability characteristics were evaluated by measuring water absorption, chloride permeability, and reinforcement corrosion. The initial and final setting time and slump retention increased due to the incorporation of EAFD in both plain and blended cement concretes. The compressive strength increased and water absorption and chloride permeability decreased due to the incorporation of EAFD. The corrosion resistance of plain and blended cement concrete specimens increased due to the addition of EAFD, The data developed in the reported study indicate a strong compatibility between EAFD and the supplementary cementing materials investigated. Since this is a by-product of steel making process, its utilization will result in both economic and environmental benefits. Also, since EAFD is composed of solid particles, the limitations of restricted shelf life associated with the liquid retarders, will be eliminated.