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PRO110

Development of mortars in Denmark from the viking age until today



Author(s): Mette Stubager Moesgaard, Thea Bech-Petersen, Helge Hansen
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: 256-265
Total Pages: 10
Language : English


Abstract: Numerous chemical and structural analyses of mortars and renders of various ages at the
Danish Technological Institute (DTI), Masonry Centre have revealed a very clear
development of masonry and rendering mortars in Denmark through the last 1000 years. The
history of Danish mortar and rendering begins in about year 1000 AD where the first masonry
structures were prepared. For the first 900 years or so, strength development in mortars was
based on carbonization of slaked lime alone. Until about year 1800 AD mortar was prepared
by hot lime mortar technology; analyses show lime contents of 25-40 % (w/w). Around 1800
AD the hot lime mortar disappeared in Denmark and was replaced by a much weaker mortar
consisting of a mix of sand and pre-slaked lime. For these mortars, the lime content was
normally 7-14 % w/w.
The hot lime mortar had high compressive and adhesive strength and was the base of e.g.
medieval structures in cathedrals and castles. The later mortars of lower lime content show
weaker strength. This type of mortar is the normal in Denmark until the 1960s.


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


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