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Effects of Alkali Activation and CO2 Curing on the Hydraulic Reactivity and Carbon Storage Capacity of BOF Slag in View of Its Use in Concrete

  • M. Morone
  • Ö. Cizer
  • G. Costa
  • R. BaciocchiEmail author
Original Paper
  • 15 Downloads

Abstract

This work investigates the sequential application of alkali activation and CO2 curing to BOF steel slag as a technique for improving its hydraulic reactivity for use in concrete, while also exploiting its potential as a carbon sink. Activation with either a sodium hydroxide/sodium-silicate or a sodium hydroxide/sodium carbonate solution was first evaluated in a preliminary calorimetric study for selecting the solution compositions leading to the formation of early stage hydration products. The pastes produced with the selected solutions were then cured either in a humidity chamber or in a carbonation chamber (at 20 or 50 °C) for up to 28 days, in order to assess long term reaction products. Mineralogical and thermal analysis showed the formation of a C–S–H like phase, specifically in the samples activated by the sodium hydroxide/sodium-silicate solution, whereas significant occurrence of gaylussite was noticed in the samples activated with the sodium hydroxide/sodium carbonate solution. A maximum CO2 uptake of 6% by wt, due to calcium carbonate formation, was observed in the latter samples, whereas a 5% value was achieved in the former ones. The compressive strength of the mortars prepared with sodium hydroxide/sodium silicate and cured in the carbonation chamber at 50 °C was above 2 MPa, while it was lower for the other samples, particularly those activated with sodium hydroxide/sodium carbonate. Alkali activation employing sodium hydroxide/sodium silicate solutions followed by CO2 curing at relatively high temperature (i.e. 50 °C) resulted a promising treatment for BOF slag valorization in the manufacturing of concrete for non structural applications.

Keywords

BOF steel slag Alkali activation Curing CO2 uptake Compressive strength Hydraulic reactivity 

Notes

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Laboratory of Environmental Engineering, Department of Civil Engineering and Computer Science EngineeringUniversity of Rome “Tor Vergata”RomeItaly
  2. 2.Department of Civil EngineeringKU LeuvenHeverleeBelgium

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