Effect of BaCO3 reactivity and mixing procedure on sulfate-resistant cement performance
The present study focuses on exploring the effects of reactivity and degree of dispersion of BaCO additions in the manufacture of sulfate-resistant OPC cements. A new electrochemical deposition method is attempted to effectively disperse BaCO particles (studying two different materials with particle...
| Authors: | , , , , |
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| Format: | article |
| Status: | Published version |
| Publication Date: | 2021 |
| Country: | España |
| Institution: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repository: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/257646 |
| Online Access: | http://hdl.handle.net/10261/257646 |
| Access Level: | Open access |
| Keyword: | Sulfate resistant cements Cement paste BaCO3 Electrodeposition Fineness Ettringite |
| Summary: | The present study focuses on exploring the effects of reactivity and degree of dispersion of BaCO additions in the manufacture of sulfate-resistant OPC cements. A new electrochemical deposition method is attempted to effectively disperse BaCO particles (studying two different materials with particle size: D = 11.45 and 2.37 μm) on cement to enhance their reactivity and favour sulfate immobilisation in the form of BaSO. 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 BaCO. Cement paste bearing 15 wt % BaCO is more resistant to sulfate attack by a 5% (w/v) solution of NaSO (180 d at 23 °C) than a commercial sulfate-resistant cement, although secondary ettringite and gypsum precipitated in all cases. |
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