Enhancement of Slag Aggregates Quality by Polymeric Immersion

Subject Areas : Composite materials

Ali Ebrahimi ¹ , Seyed Esmaeil Mohamamdyan-Yasouj ^{2 *} , Hossein Abbastabar ³

1 - Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
2 - Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
3 - Department of Chemistry, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

Received: 2024-07-23 Accepted : 2024-11-05 Published : 2023-09-23

Keywords: Steel Slag, concrete, aggregate, PVA, PDMS, Silicate, porosity,

Abstract :

Utilization of steel slag aggregate (SSA) has been significantly developed in recent years. According to the volume expansion of SSA caused by F-CaO content, finding a suitable way to replace this type of aggregate in concrete has always been one of the crucial concerns. In the current study, enhancing a type of SSA, obtained from the waste of short casting furnaces called cupola furnace slag, is studied by utilizing different coating materials. In general, a positive effect can be observed on the enhancement of physical properties and microstructure of SSA by polyvinyl alcohol (PVA), polydimethylsiloxane (PDMS), and sodium silicate (SS) immersion. More specifically, porosity and water absorption of SSA were improved between 40 and 70%, which is notable. In addition, its impact value increases about 25% in some categories. More importantly, XRD diffraction analysis illustrates details about the reduction of F-CaO content, which occurred by the coating process. Therefore, immersion of SSA in these polymeric materials can be suggested as an appropriate method to improve its quality for utilization in concrete.

References:

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