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Durability of Air Lime mortar

Author(s): Anders Nielsen
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016 segment on
Historical Masonry
Editor(s): Inge Rörig-Dalgaard and Ioannis Ioannou
ISBN: 978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 122-128
Total Pages: 7
Language : English

Abstract: This contribution deals with the physical and chemical reasons why pure air lime mortars
used in masonry of burned bricks exposed to outdoor climate have shown to be durable from
the Middle Ages to our days. This sounds strange in modern times where pure air lime
mortars are regarded as weak materials, which are omitted from standards for new masonry
buildings, where use of hydraulic binders is prescribed.
The reasons for the durability seam to be two:
1. The old mortars have high lime contents.
2. The carbonation process creates a pore structure with a fine pored outer layer and
coarser pores inside. This difference in pore size will delay the capillary suction of rain from
outside, while excess water inside can be sucked to the front and evaporate.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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