Effect of BaCO3 reactivity and mixing procedure on sulfate-resistant cement performance Articles uri icon

publication date

  • July 2021

start page

  • 1

end page

  • 14

issue

  • 104038

volume

  • 120

International Standard Serial Number (ISSN)

  • 0958-9465

Electronic International Standard Serial Number (EISSN)

  • 1873-393X

abstract

  • The present study focuses on exploring the effects of reactivity and degree of dispersion of BaCO3 additions in the manufacture of sulfate-resistant OPC cements. A new electrochemical deposition method is attempted to effectively disperse BaCO3 particles (studying two different materials with particle size: D50 = 11.45 and 2.37 μm) on cement to enhance their reactivity and favour sulfate immobilisation in the form of BaSO4. The barium carbonate additions, particularly the finest, activate cement hydration to a greater extent. Electrodeposition is also observed to improve early age reactivity (2 d-7 d) in fine BaCO3. Cement paste bearing 15 wt % BaCO3 is more resistant to sulfate attack by a 5% (w/v) solution of Na2SO4 (180 d at 23 ºC) than a commercial sulfate-resistant cement, although secondary ettringite and gypsum precipitated in all cases.

subjects

  • Chemistry
  • Industrial Engineering
  • Materials science and engineering

keywords

  • baco3; cement paste; electrodeposition; ettringite; fineness; sulfate resistant cements