Disadvantages Of Steel Slag

Steel slag is a steel-making waste from the steel industry and is reused as it is in many engineering fields, including transportation and highway engineering, environmental engineering, and geotechnical engineering. It is used as either an additional or substitute material in road construction, filter or soil stabilizer in these cases. Indeed, soil stabilization using steel slag is popular in Europe and Asian country as a result of a concerted effort towards reducing wastes and optimizing resources. Steel slag can be produced from two different processes, namely, from the conversion of iron into molten iron and from the manufacturing process to modify the components of molten iron in making strong steel. The byproducts of the processes can

The molten iron from a blast furnace will be processed to make strong steel. If a converter is used in the steel-making process, with water being sprayed on the slag for cooling purpose, the slag generated is termed a converter slag. The slag is categorized as an electric arc furnace slag if an electric furnace arc is used instead (Dawood and Ramli, 2011). The cementing properties of activated steel slag using alkaline are higher than those of raw steel slag due to the chemical reactions between the steel slag and sodium hydroxide (NaOH). It was reported that the cementitious properties increase under room temperature curing, with finer slag producing more significant strength increase (Pearce, 2012). The most commonly used alkaline activators are sodium hydroxide, potassium hydroxide, sodium water glass, and potassium water glass. All these activators have some common properties: caustic, corrosive, and highly hazardous. Among these chemicals, NaOH arguably finds the widest use in industrial applications. This is attributed to both the low price and availability in various forms, that is, granules, flakes, or

II.MATERIALS AND METHOD

A. Materials Ordinary Portland Cement: Dangote brand of ordinary Portland cement with properties conforming to BS 12 was used in this study. Steel Slag: Steel slag was obtained as a by-product of the production of iron. Calcium aluminate: This was bought from marketers of industrial chemicals. Aggregates: The coarse aggregate from crushed granite was collected from igneous origin. The particle size used ranged between 5 to 20 mm (Croney, 2008). River sand as fine aggregate was used to mix the concrete conforming to BS 882 and the ASTM Standard C33 (2006). All particles passed through ASTM sieve No. 4 aperture 4.75 mm but were retained on sieve No. 230, aperture 63 μm (Porter,2011). Water: The Potable drinking water was collected from the laboratory stand post and conformed to the specification of EN 1008

B.