Optimal Replacement of Granite Modified with Ife Iron and Steel Slag on Strength Properties of Concrete

Abstract

Steel is produced from iron ore and purification of metal scrap, leading to manufacture of hundreds of tonnes of steel slag each year. This study investigated the optimum replacement of granite with Ife Iron and Steel Nigeria Limited (ISN) slag that produce maximum Compressive Strength (CS), Split Tensile Strength (STS) and Flexural Strength (FS) of concrete using Response Surface Methodology (RSM) from Design Expert Version 7.0. The outcome of the study showed that the optimum replacement of granite with ISN was 28.85% ISN at 0.47 W/C.

Evaluation of the Statistical Significance of Compactive Efforts, Slag and Cement on the Geotechnical Features of Laterite Soil

“…This is an indication that the strength and density of the soil can be enhanced with the addition of steel slag. This is because steel slag exhibited strong binding medium between the micro-sized clay particles leading to the formation of macro-sized particle of higher density and compactness which is primarily due to the high pozzolanicity as a result of high iron oxide content in steel slag [14,47].…”

“…Studies have also clearly shown that not more than 50% of these wastes are currently converted into different purposes while larger percentages are dumped in the environment [9][10][11][12][13]. However, a sustainable and environmentally friendly way of solving these challenges is to consider the possibility of waste minimization by recycling and reusing [14][15], and one of such ways that has received the attention of environmental researchers, considered in this study, is by incorporating the industrial waste steel slag into the weak lateritic soil as a means of improving the properties of the soil and at the same time reducing the accumulation of the waste material in the environment. As the continuous production of wastes without proper disposal system will always pose a great threat to the environment.…”

“…Several studies have ascertained steel slag to be a potential material for either partial or total replacement for cement and aggregates in the production of concrete [14,[16][17][18][19][20][21][22][23]. Additionally, Kothai and Malathy [24] reported that steel slag has several advantages in terms of its high strength, high density, relative availability and abundance of this material in many countries, which has enhanced its usage as a replacement material for coarse aggregate in concrete production.…”