Use of Mine Tailings as Precast Construction Materials through Alkali Activation

Bo Huang, Qingming Feng, Dongbo An, Jinhong Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

A study of the application of mine tailings as precast construction materials through alkali activation has been carried out, focusing on efficiently activating mine tailings, reducing alkali consumption, decreasing curing time and improving compressive strength. Firstly, the effect of temperature on the alkali activation of mine tailings was studied. Secondly, the impact of additives, i.e., calcium hydroxide and aluminum oxide, on the compressive strength of samples was investigated. Thirdly, the impact of forming pressure on sample strength was studied. Test results showed that unconfined compressive strength (UCS) of 40 MPa was achieved with the geopolymerization products through optimization. Finally, to elucidate the geopolymerization mechanism of mine tailings, microscopic and spectroscopic techniques including SEM/EDX, XRD, and FTIR spectroscopy were used to investigate the microstructure and the elemental and phase composition of the geopolymerization products. The findings of the present work provide a practical method for applying mine tailings as precast construction materials through alkali activation.

Original languageEnglish (US)
Pages (from-to)251-265
Number of pages15
JournalMining, Metallurgy and Exploration
Volume37
Issue number1
DOIs
StatePublished - Feb 1 2020

Keywords

  • Alkali activation
  • Compressive strength
  • Durability
  • Geopolymerization
  • Mine tailings

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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