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Historic trass - lime mortars with expansive reactions: characterization and repair strategies



Title: Historic trass - lime mortars with expansive reactions: characterization and repair strategies
Author(s): R.P.J. Van Hees, T.G. Nijland, J.A. Larbi, T.J. Wijffels, H. Brocken
Paper category : conference
Book title: Workshop Repair Mortars for Historic Masonry
Editor(s): C. Groot
Print-ISBN: None
e-ISBN: 978-2-35158-083-7
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 132 - 142
Total Pages: 11
Nb references: 19
Language: English


Abstract: The characterisation of two ancient mortars in historic bridges, suffering damage due to thaumasite and other swelling compounds is described. Characterisation was part of the analysis of damage occurring to the brick masonry structure. Expansive reactions were found to have taken place, being the cause of the damage to the masonry. In both cases hydraulic mortars were involved: lime mortars with pozzolanic aggregate. One case concerned the mortar of a 18th century canal bridge in Amsterdam, the other the mortar of a 19th century railway bridge. In both cases the strategy to deal with the problem should consist of a combination of reduction of moisture penetration, combined with a mortar meant to be better compatible with the conditions of the masonr y (i.e. the presence of moisture and of sulfate).
Generally a trass-lime mortar is considered to be a good choice under the described conditions. Possible explanations for its failure are discussed.


Online publication: 2009-06-08
Publication type : full_text
Public price (Euros): 0.00