Multiple techniques were applied to the investigation of the phase composition of the deteriorated surface of Portland-limestone cement concrete specimens exposed for 10 years to conditions promoting thaumasite sulfate attack. The results were interpreted in terms of the limestone content of cement and the incorporation of supplementary cementitious materials (SCMs) (natural pozzolana, blastfurnace slag, metakaolin). Thaumasite, detected in high amounts in concrete specimens made without SCMs, was associated with Al to some extent. Considerable degradation of calcium silicate hydrate occurred in all specimens, resulting in the formation of Al-associated cross-linked silicate chains, magnesium silicate hydrate and silica gel, a process most effectively prevented by metakaolin. For the highest limestone content in cement or use of natural pozzolana, thaumasite underwent extensive decomposition. Al incorporation into cross-linked silicate chains increased with increasing limestone content in cement. Longer aluminosilicate chains with larger Al fractions were observed in concrete specimens incorporating SCMs.

Long-term thaumasite sulfate attack on Portland-limestone cement concrete: A multi-technique analytical approach for assessing phase assemblage / Sotiriadis, K.; Macova, P.; Mazur, A. S.; Viani, A.; Tolstoy, P. M.; Tsivilis, S.. - In: CEMENT AND CONCRETE RESEARCH. - ISSN 0008-8846. - 130:(2020), pp. 105995-105995. [10.1016/j.cemconres.2020.105995]

Long-term thaumasite sulfate attack on Portland-limestone cement concrete: A multi-technique analytical approach for assessing phase assemblage

Viani A.;
2020

Abstract

Multiple techniques were applied to the investigation of the phase composition of the deteriorated surface of Portland-limestone cement concrete specimens exposed for 10 years to conditions promoting thaumasite sulfate attack. The results were interpreted in terms of the limestone content of cement and the incorporation of supplementary cementitious materials (SCMs) (natural pozzolana, blastfurnace slag, metakaolin). Thaumasite, detected in high amounts in concrete specimens made without SCMs, was associated with Al to some extent. Considerable degradation of calcium silicate hydrate occurred in all specimens, resulting in the formation of Al-associated cross-linked silicate chains, magnesium silicate hydrate and silica gel, a process most effectively prevented by metakaolin. For the highest limestone content in cement or use of natural pozzolana, thaumasite underwent extensive decomposition. Al incorporation into cross-linked silicate chains increased with increasing limestone content in cement. Longer aluminosilicate chains with larger Al fractions were observed in concrete specimens incorporating SCMs.
2020
130
105995
105995
Long-term thaumasite sulfate attack on Portland-limestone cement concrete: A multi-technique analytical approach for assessing phase assemblage / Sotiriadis, K.; Macova, P.; Mazur, A. S.; Viani, A.; Tolstoy, P. M.; Tsivilis, S.. - In: CEMENT AND CONCRETE RESEARCH. - ISSN 0008-8846. - 130:(2020), pp. 105995-105995. [10.1016/j.cemconres.2020.105995]
Sotiriadis, K.; Macova, P.; Mazur, A. S.; Viani, A.; Tolstoy, P. M.; Tsivilis, S.
File in questo prodotto:
File Dimensione Formato  
2020_4_Sotiriadis.pdf

Accesso riservato

Tipologia: Versione pubblicata dall'editore
Dimensione 1.73 MB
Formato Adobe PDF
1.73 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1315762
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 32
  • ???jsp.display-item.citation.isi??? 27
social impact