Deterioration of historic brick masonry due to combined gypsum, ettringite and thaumasite: A case study
conference paper
A case study is presented of severe deterioration of historic late 19th century brick
masonry due to combined gypsum, ettringite and thaumasite. The case is remarkable,
because these minerals developed in the original mortar made up by a mixture of
Rhenish trass and lime, in which in particular for ettringite, no specific precursor (such
as C3A in ordinary Portland cement), could be identified. The case study demonstrates
that, regardless the sulphate resistant reputation of trass cements, trass – lime
mortars may suffer from sulphate attack.
masonry due to combined gypsum, ettringite and thaumasite. The case is remarkable,
because these minerals developed in the original mortar made up by a mixture of
Rhenish trass and lime, in which in particular for ettringite, no specific precursor (such
as C3A in ordinary Portland cement), could be identified. The case study demonstrates
that, regardless the sulphate resistant reputation of trass cements, trass – lime
mortars may suffer from sulphate attack.
Topics
TNO Identifier
330752
Source title
13th International Brick and Block Masonry Conference (IB2MaC), Amsterdam, 4-7 July
Pages
1-8
Files
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