Performance and microstructure of MgO-SiO2 concrete under different environments

C Sonat, WW Teo, C Unluer

Research output: Contribution to journalArticlepeer-review

Abstract

This study investigated the changes in the performance and microstructure of MgO-SiO2 concrete under exposure to different environments involving carbonation, NaCl, MgCl2 and MgSO4 solutions for up to 180 days. Compressive strength results were compared to Portland cement (PC)-based concrete samples subjected to the same environments. Microstructural analysis performed via FESEM, XRD and TG/DTG indicated a lack of change in the composition of MgO-SiO2 samples. The sustained mechanical performance and the clear presence of hydrate phases such as brucite and M-S-H even after longer exposures highlighted the resistance of MgO-SiO2 formulations and their potential to be utilized in structural applications.
Original languageEnglish
Pages (from-to)549-564
Number of pages16
JournalConstruction and Building Materials
Volume184
Early online date9 Jul 2018
DOIs
Publication statusPublished - 30 Sept 2018

Keywords

  • durability
  • M-S-H
  • MgO
  • microstructure
  • SiO2
  • strength

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