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Influence of Content and Source of Calcium Sulfate on Supersulfated Cement Exposed to Sodium and Magnesium Sulfate Attack at Later Ages
https://orcid.org/0000-0003-1252-1893
https://orcid.org/0000-0002-8007-1620
https://orcid.org/0000-0003-4879-4869
Supersulfated cement (SSC) consists essentially of blast-furnace slag and calcium sulfate. It can be considered an alternative to Portland cement because its production minimizes the environmental impacts caused by the exploration of raw materials and CO2 emissions. However, the long-term durability of SSC still needs to be studied. In this article, the influence of the composition of the SSC in the attack by sodium and magnesium sulfates was analyzed, varying the source (gypsum and phosphogypsum) and content (10% and 20%) of calcium sulfate. The source of calcium sulfate did not significantly influence the resistance to sulfate attack, but it did change the mechanical strength of the SSC. The results showed that at the end of two years, all SSC samples were resistant to sodium sulfate attack; SSC pastes naturally formed a large amount of ettringite at early ages, preventing expansion at later ages. The SSC containing more calcium sulfate was the only mixture resistant under magnesium sulfate attack. A higher content of calcium sulfate in the composition of SSC can reduce the rate of diffusion of sulfate ions and improve their resistance to attack by magnesium sulfate. The lower formation of C─ S─ H, together with a higher content of calcium sulfate, provided an SSC with the best performance under magnesium sulfate attack.
Influence of Content and Source of Calcium Sulfate on Supersulfated Cement Exposed to Sodium and Magnesium Sulfate Attack at Later Ages
https://orcid.org/0000-0003-1252-1893
https://orcid.org/0000-0002-8007-1620
https://orcid.org/0000-0003-4879-4869
Supersulfated cement (SSC) consists essentially of blast-furnace slag and calcium sulfate. It can be considered an alternative to Portland cement because its production minimizes the environmental impacts caused by the exploration of raw materials and CO2 emissions. However, the long-term durability of SSC still needs to be studied. In this article, the influence of the composition of the SSC in the attack by sodium and magnesium sulfates was analyzed, varying the source (gypsum and phosphogypsum) and content (10% and 20%) of calcium sulfate. The source of calcium sulfate did not significantly influence the resistance to sulfate attack, but it did change the mechanical strength of the SSC. The results showed that at the end of two years, all SSC samples were resistant to sodium sulfate attack; SSC pastes naturally formed a large amount of ettringite at early ages, preventing expansion at later ages. The SSC containing more calcium sulfate was the only mixture resistant under magnesium sulfate attack. A higher content of calcium sulfate in the composition of SSC can reduce the rate of diffusion of sulfate ions and improve their resistance to attack by magnesium sulfate. The lower formation of C─ S─ H, together with a higher content of calcium sulfate, provided an SSC with the best performance under magnesium sulfate attack.
Influence of Content and Source of Calcium Sulfate on Supersulfated Cement Exposed to Sodium and Magnesium Sulfate Attack at Later Ages
https://orcid.org/0000-0003-1252-1893
https://orcid.org/0000-0002-8007-1620
https://orcid.org/0000-0003-4879-4869
Supersulfated cement (SSC) consists essentially of blast-furnace slag and calcium sulfate. It can be considered an alternative to Portland cement because its production minimizes the environmental impacts caused by the exploration of raw materials and CO2 emissions. However, the long-term durability of SSC still needs to be studied. In this article, the influence of the composition of the SSC in the attack by sodium and magnesium sulfates was analyzed, varying the source (gypsum and phosphogypsum) and content (10% and 20%) of calcium sulfate. The source of calcium sulfate did not significantly influence the resistance to sulfate attack, but it did change the mechanical strength of the SSC. The results showed that at the end of two years, all SSC samples were resistant to sodium sulfate attack; SSC pastes naturally formed a large amount of ettringite at early ages, preventing expansion at later ages. The SSC containing more calcium sulfate was the only mixture resistant under magnesium sulfate attack. A higher content of calcium sulfate in the composition of SSC can reduce the rate of diffusion of sulfate ions and improve their resistance to attack by magnesium sulfate. The lower formation of C─ S─ H, together with a higher content of calcium sulfate, provided an SSC with the best performance under magnesium sulfate attack.
Influence of Content and Source of Calcium Sulfate on Supersulfated Cement Exposed to Sodium and Magnesium Sulfate Attack at Later Ages
J. Mater. Civ. Eng.
Trentin, Priscila O. (author) / Magro, Isabel C. (author) / Souza, Laura R. M. N. (author) / Bonini, Janaína S. (author) / Angulski da Luz, Caroline (author) / Medeiros-Junior, Ronaldo A. (author) / Hooton, Robert D. (author)
2023-01-01
Article (Journal)
Electronic Resource
English
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