Effect of Using Steel Slag Aggregate on Mechanical Properties of Concrete

Abstract

This study presents an evaluation of the physical and mechanical properties and characteristics of steel slag aggregate concrete in comparison with the typical crushed limestone stone aggregate concrete. Hardened concrete consist of more than 70% aggregate due to the high demand in building construction and the increase of the amount of disposed waste material, suppliers and researchers are exploring the use of alternative materials which could preserve natural sources and save the environment. In this study, steel slag was used as an aggregate replacement in conventional concrete mixes. Steel slag which is mainly consists of calcium carbonate is produced as a by-product during the oxidation process in steel industry. Steel slag was selected due to its characteristics, which are almost similar to conventional aggregates and the fact that it is easily obtainable as a by-product of the steel industry. As a result, utilization of steel slag will save natural resources and clean environment. Furthermore, results have shown that slag aggregate has better abrasion factor and impact value than conventional aggregate. Thorough investigation of the results have indicated that the amount of increase in compressive strength at age of 7 days are much more than that of age 28 days for all types of aggregate replacement. This indicates that the added slag could work as accelerator at early age while at 28 days age, the effect is reduced. The fine slag replacement scores the highest effect.

Steel furnace slag aggregate expansion and hardened concrete properties

“…However, these two SFS aggregate sources reduced the split tensile strength relative to the control concrete. These findings agree with the literature in that SFS aggregates can increase [18,20,22,34,42,56,57,[67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86] or decrease [16,59,[87][88][89] the compressive strength and similarly increase [18,20,22,42,57,70,[72][73][74]76,79,82,85,90,91] or decrease [75,80,89] …”

Geopolymer Concrete Using Scrap Steel Slag as Coarse Aggregate

“…Thus, this experimental study is carried out replacing the natural coarse aggregate in cement-less geopolymer concrete by scrap steel slag, an industrial waste. 1 studied the effects of using steel slag aggregate on mechanical properties of concrete and reports that steel slag acts as accelerator at early age and 7 days strength of steel slag concrete is higher and at 28 days, the effect is reduced. 2) Mohammed Nadeem, Arun Pofale (2012) 2 investigated use of different types of steel slag as coarse in concrete and reports that steel slag absorbs lesser water than brick aggregate.…”

Behaviour of fibre reinforced concrete using steel slag coarse aggregate produced in Qatar

“…One of the potential resources of recycled concrete is steel slag, knowing that steel slag is the most significant solid waste generated by Qatar Steel Company in Qatar [1]. Several researchers have shown that steel slag can be used as an aggregate in structural concrete [2][3][4][5][6]. The use of steel slag in concrete applications has major economic and environmental benefits to Qatar.…”

“…However, a number of publications have contradicted this idea [3][4][5][6]. Recently, a number of researchers studied the possibility of using steel slag in concrete mixes as a coarse aggregate to make sustainable concrete [3][4].…”