Utilization possibilities of steel slag as backfill material in coastal structures

Abstract

The aim of this study is to investigate the utilization possibilities of steel slags, basic oxygen furnace (BOF) and electric arc furnace (EAF) slags, as backfill material in coastal structures. Within the scope of the study, physical, mechanical and chemical properties of the steel slags were investigated and their potential to create environmental risks were evaluated. The results showed that soundness loss and filler content ratio were below the limit values for steel slags to be used as backfill material. It was determined that the density, porosity, water absorption and Los Angeles abrasion ratios of steel slags were generally higher than natural aggregates. In order to reach the California Bearing Ratio (CBR) limit (> 25%), the maximum particle size of the steel slag was reduced to 25 mm. In this particle size, CBR of the slag samples generally gave better results compared to the natural aggregate (38%), except for Kardemir and Asil samples. In addition, the concentration values of heavy metals (Cu, Cd, Cr, Pb, Ni, Zn, Hg and As) were below the limit values specified in the regulation. It is suggested that EAF slags should be aged for at least 6 months and BOF slags for at least 24 months in open air conditions before being used as backfill material in coastal structures after the maximum particle size is reduced to 25 mm.

Influence of Solid Waste Material Content on the Properties of Steel Slag-Waste Clay Brick Ceramic Bricks

“…In recent years, there has been increasing research interest in exploring resource utilization options for SS. Current approaches primarily focus on utilizing its high strength and wear resistance as road backfill material [5,6], leveraging its porosity and alkalinity for sewage treatment purposes [7,8], harnessing its rich P, Ca, and Si elements to produce fertilizer [9,10], or incorporating it as a component in cement mixers to manufacture cement products [11]. However, these utilization methods still face certain challenges.…”

Ferrocenes and Porphyrins as Acidithiobacillus ferrooxidans Growth Activators under Ultrasound Irradiation

“…[1] By the way, it is also expensive from an economic point of view, since metallurgical companies pay huge sums of money for storing slag. [2] At the same time, most of its iron content is often comparable to ore concentrates and is a valuable raw material abandoned by the owner. For example, scale from rolling and forging industries can contain up to 55-60 % iron oxides.…”