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REWAS 2019 pp 177-187 | Cite as

Reactivity of Crystalline Slags in Alkaline Solution

  • Brian Traynor
  • Hugo Uvegi
  • Piyush Chaunsali
  • Elsa OlivettiEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Slags with varied amorphous and crystalline content, typical of iron and steel production, are generally underutilized. One promising reuse pathway for these wastes is chemical activation, producing alternatives to conventional building materials with lower embodied energy. The formation of a hardened binder is dependent on the slag mineralogy and, specifically, the reactivity of relevant phases. Reactivity can be understood by monitoring elemental dissolution rates through inductively coupled plasma (ICP-OES) analysis. Post-dissolution ICP analysis of activating solution and spectroscopic analysis of remaining solids was performed on several highly crystalline slags and on relevant synthetic minerals to track changes in chemical and phase composition. Amorphous and ionic phases have been observed as more reactive than other crystalline phases. This work aims to inform future studies on waste blending in alkali-activated systems, a promising avenue for valorization of industrial wastes with varied physicochemical properties. To this end, dissolution tests with varied initial Si, Al, and Ca concentrations in activating solution were also performed.

Keywords

Slag Alkali activation Γ-C2

Notes

Acknowledgements

We would like to acknowledge the financial support for this research through the Tata Center for Technology and Design as well as the Environmental Solutions Initiative, both at Massachusetts Institute of Technology (MIT), Cambridge. We also acknowledge the support from NSF CAREER #1751925.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Brian Traynor
    • 1
  • Hugo Uvegi
    • 1
  • Piyush Chaunsali
    • 2
  • Elsa Olivetti
    • 1
    Email author
  1. 1.Department of Materials Science and EngineeringMITCambridgeUSA
  2. 2.Department of Civil EngineeringIIT MadrasChennaiIndia

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