Resistance of phosphogypsum-based supersulfated cement to carbonation and chloride ingress
| Autor: | Ronaldo A. Medeiros-Junior, Sabrina Requião Pinto, Caroline Angulski da Luz, Guilherme da Silva Munhoz |
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| Rok vydání: | 2020 |
| Předmět: |
Cement
Ettringite Chloride penetration Materials science Carbonation Metallurgy 0211 other engineering and technologies 020101 civil engineering Phosphogypsum 02 engineering and technology Building and Construction engineering.material Chloride Portlandite 0201 civil engineering chemistry.chemical_compound chemistry 021105 building & construction Service life engineering medicine General Materials Science Civil and Structural Engineering medicine.drug |
| Zdroj: | Construction and Building Materials. 263:120640 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2020.120640 |
| Popis: | The search for cements with lower CO2 emissions and lower consumption of non-renewable materials has been a challenge for the cement industry. The aim of this study was to investigate the resistance of SSC concrete to carbonation and chloride ingress. Portland cements (CEM I and CEM III/B) were used as a comparison. The results showed that the carbonation was very advanced in the SSC concretes. This is related to the exclusive formation of C-S-H and ettringite as hydration products, which present a higher rate of carbonation than portlandite. The SSC concrete has a good performance in terms of chloride penetration, mainly due to the increased ability to combine chloride ions both physically and chemically. The service life estimation showed that SSC concretes could be suitable for rural and urban environments when low w/c ratios (0.40) are used. All SSC mixtures studied were suitable for chloride environments. |
| Databáze: | OpenAIRE |
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