Performance of High Density Concrete with Mill Scale Waste

Concrete is being used on a very large scale throughout the world in an indiscriminate way thereby calls for an environmental friendly solution to produce sustainable concrete by judicious use of resources. Studies are carried out to find alternatives for the natural aggregates which are being depleted. Steel industry during its production is known to generate different types of solid waste, one of which is mill scale waste. This waste was used to develop a concrete mix by completely replacing natural aggregates. A high density mix was achieved with a density of 3.1 t/m³ (intended to be used in the production of ballasts for washing machines). Early strength requirements of 35 MPa are met within 7 days of curing. This paper emphasizes on the resistance of the mix to acid attack. The performance of concrete was studied by immersing the cubes in sulphuric acid of 1 and 2% concentration. Investigations carried out have showed that the loss of compressive strength was minimum by the introduction of corrosion inhibiting admixture. Loss of mass was also considerably low.