Comparison of glass powder and pulverized fuel ash for improving the water resistance of magnesium oxychloride cement

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Abstract

The water resistance of magnesium oxychloride cement (MOC) incorporating glass powder (GP) and pulverized fuel ash (PFA) with and without CO 2 curing was investigated in terms of the strength retention coefficient and the volume stability. The microstructure was studied using quantitative X-ray diffraction (QXRD), thermogravimetry (TG), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the effect of incorporating GP on the water resistance is much lower than that of PFA due to the lower pozzolanic activity of GP generating a lower amount of magnesium silica hydrate gel (M-S-H gel). The MOC incorporated with GP or PFA showed high water resistance after CO 2 curing due to the higher quantity of amorphous gel that formed a much denser interlocking network.

Original languageEnglish
Pages (from-to)98-109
Number of pages12
JournalCement and Concrete Composites
Volume86
DOIs
Publication statusPublished - 1 Feb 2018

Keywords

  • CO curing
  • Gel formation
  • Magnesium oxychloride cement (MOC)
  • Microstructure
  • Water resistance

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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