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Formation of thaumasite in carbonated mortars
The main objective of this study was to investigate the formation of thaumasite in carbonated Portland cement mortars. Another important purpose was to study the role that ettringite (AFt) plays in the process of formation of Thaumasite and its influence in the deterioration of the mortars. Work was carried out with mortar prisms, elaborated using two different cements: one of them with low Al2O3 content (exempt of C3A) and the other one with high Al2O3 content. Additions of different amounts of gypsum and/or calcium carbonate were also done. After 3 months of curing at 21 deg C and 100 % RH mortars were submitted to an accelerated carbonation process until total transformation of Ca(OH)2 into CaCO3. Then mortar prisms were partially immersed in distilled water and kept at temperature ranging from 0-5 deg C for one year. A mineralogical, micro-structural and physical characterisation was carried out on samples at different ages. The thaumasite formation rate was much lower in those mortars elaborated with the cement exempt of C3A than in those mortars made with the cement having high proportion of C3A when they are conserved in water. The study of transversal sections of prisms reveals the presence of a white expansive product (thaumasite) not always homogeneously distributed.
Formation of thaumasite in carbonated mortars
The main objective of this study was to investigate the formation of thaumasite in carbonated Portland cement mortars. Another important purpose was to study the role that ettringite (AFt) plays in the process of formation of Thaumasite and its influence in the deterioration of the mortars. Work was carried out with mortar prisms, elaborated using two different cements: one of them with low Al2O3 content (exempt of C3A) and the other one with high Al2O3 content. Additions of different amounts of gypsum and/or calcium carbonate were also done. After 3 months of curing at 21 deg C and 100 % RH mortars were submitted to an accelerated carbonation process until total transformation of Ca(OH)2 into CaCO3. Then mortar prisms were partially immersed in distilled water and kept at temperature ranging from 0-5 deg C for one year. A mineralogical, micro-structural and physical characterisation was carried out on samples at different ages. The thaumasite formation rate was much lower in those mortars elaborated with the cement exempt of C3A than in those mortars made with the cement having high proportion of C3A when they are conserved in water. The study of transversal sections of prisms reveals the presence of a white expansive product (thaumasite) not always homogeneously distributed.
Formation of thaumasite in carbonated mortars
Thaumasitbildung in carbonatisiertem Mörtel
Aguilera, J. (author) / Martinez-Ramirez, S. (author) / Pajares-Colomo, I. (author) / Blanco-Varela, M.T. (author)
2002
9 Seiten, 9 Bilder, 2 Tabellen, 20 Quellen
Conference paper
Storage medium
English
Formation of thaumasite in carbonated mortars
| Online Contents | 2003
Formation of thaumasite in carbonated mortars
| British Library Conference Proceedings | 2003
Formation of thaumasite in carbonated mortars
| Elsevier | 2003
| British Library Online Contents | 2006