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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… Click to show full abstract
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 °C) than a commercial sulfate-resistant cement, although secondary ettringite and gypsum precipitated in all cases.
Journal Title: Cement and Concrete Composites
Year Published: 2021
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