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The IUP Journal of Structural Engineering :
A Study on the Properties of Concrete with Steel Slag as Fine Aggregate and Marble Waste as Coarse Aggregate.
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In construction industry, concrete is the largest produced material compared to all other materials. Aggregates are the important constituents in concrete. The increase in demand for the ingredients of concrete is met by partial replacement with the waste materials obtained by means of various industries. Steel slag and marble waste are the waste products generated during the production of steel and marble, which are disposed in the form of landfills, causing an enormous amount of land pollution. Therefore, partial replacement of natural aggregates with steel slag and marble waste would lead to considerable environmental benefits which have been emphasized in this paper. Experiments were conducted and data required for mix design were obtained. M25 grade concrete is designed as per the Indian standard code. The water-cement ratio is maintained for this mix design as 0.51. The steel slag and marble wastes were properly cut down to the required size of fine and coarse aggregate respectively. Then the steel slag was mixed with the concrete as fine aggregate in the percentages of 20%, 30% and 40%. It was observed that 30% was the optimum percentage replacement of fine aggregate using steel slag. Then the specimens were casted using this 30% steel slag as fine aggregate with variable percentages of marble waste as 20%, 30% and 40% as coarse aggregate subjected to curing of 28 days, from which their strength and durability properties were determined. The determined properties were compared with that of the conventional concrete. Of the above percentage mixes, partial replacement of fine aggregate by 30% steel slag and partial replacement of coarse aggregate by 40% marble waste mix were found to be favorable.

 
 

Concrete is unique among the major construction materials because it is designed specifically for civil engineering projects. It plays a critical role in the design and construction of the nationís infrastructure. Aggregate occupies about 65 to 80% of the total volume of concrete and affects the freshness and hardness properties of concrete. Out of the total consumption of the concrete, coarse aggregate consumes around 40 to 60% and fine aggregate consumes around 20 to 30% of the volume. To meet the global demand for concrete in the future, it is becoming a more challenging task to find suitable alternatives to natural aggregates for preparing concrete. The purpose of this study is to find out the suitable material for replacement of fine aggregate and coarse aggregate in concrete and explore the feasibility of utilizing the steel slag produced by steel mills and marble wastes produced by the marble quarries in Tamil Nadu region as a replacement for natural aggregate in the concrete. Steel slag aggregates generally exhibit the potential to expand due to the presence of unhydrated free lime and magnesium oxides which hydrate in humid environments and the waste marble aggregates have about 10% water absorption characteristic of natural conventional aggregate, and also the marble aggregate lacks finer fractions as compared to the natural aggregate. If such products are used in the concrete, it enhances both the mechanical and physical properties of concrete along with its durability.

 
 

Steel slag, Marble waste, Replacement, Durability.