Hot applied lime mortar – assessment of a traditional technique used in modern restoration

Author(s): Thomas Köberle, Matthias Zötzl, Alexander Fenzke, Heiner Siedel
Paper category: Proceedings
Book title: Proceedings of the 5th Historic Mortars Conference
Editor(s): José Ignacio Álvarez, José María Fernández, Íńigo Navarro, Adrián Durán, Rafael Sirera
ISBN: 978-2-35158-221-3
e-ISBN: 978-2-35158-222-0
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 614-627
Total Pages: 14
Language : English

Abstract: Lime was one of the most important binder groups used for mortars in historic building
activities and is often favoured in restoration work due to its mechanical and chemical
compatibility to the historic structures. In the past, different methods of slaking were
in use. One remarkable method is to slake and process the lime binder in one
procedure. Thus, the heat development during slaking is part of the working process
when the mortar is applied in this hot stage. The technique of hot applied mortar
(HAM) is quite rare in use today. However, craftsmen assign unique properties to such
hot applied mixtures, like better cohesion, fast setting and a slight expansion during
the slaking process, which could prevent shrinkage. In addition, a higher initial strength
and better salt resistance is postulated. This performance seems to be of interest for
modern restoration work. To compare hot applied mortars with hot mixed mortars,
which are normally used after they cooled down, test areas on a medieval wall from a
monastery in Saxony were applied and evaluated during a one-year cycle. In addition,
laboratory tests with the same mortar mixtures were conducted.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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