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Lime-based Repair Mortars: Influence by Surface Working Methods onBehaviour and Durability of Mortar
Chalmers. (Kulturvård)ORCID iD: 0000-0002-2994-1766
Göteborgs Universitet.
2006 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The main purpose of this study was to observe the influence by different surface working methodson behaviour, durability and appearance of lime-based stone-repair mortars.The findings are based on:

- Observations made during restoration work

- Observations from field stations

- Microscopic analysis of thin sections of mortar

- Parallel studies on lime plaster

The results show clear differences in durability, appearance and behaviour of lime-based mortar dependingon at which stage of the drying process the mortar is worked on. For achieving durable mortar it is importantto avoid the development of a surface lime-film. The study implies that the mortar, only when worked on at aspecific stage of drying, will be durable and have a structure, texture and porosity compatible with the surroundingstone material.

Place, publisher, year, edition, pages
2006.
National Category
Other Natural Sciences
Research subject
Conservation (HGO)
Identifiers
URN: urn:nbn:se:uu:diva-220079OAI: oai:DiVA.org:uu-220079DiVA: diva2:704007
Conference
Proceedings of the International Conference of Heritage, Weathering and Conservation HWC-2006, Madrid, Spain 2006.
Funder
Knowledge Foundation
Available from: 2014-03-10 Created: 2014-03-10 Last updated: 2014-04-16
In thesis
1. Traditional lime mortar and plaster : Reconstruction with emphasis on durability
Open this publication in new window or tab >>Traditional lime mortar and plaster : Reconstruction with emphasis on durability
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lime mortar and plaster have been investigated with the aim to improve the knowledge on how to make them as durable as before the cement technology was developed. The background was the durability problems experienced for newly produced lime plaster on the medieval churches on the island of Gotland, Sweden. In some cases the new lime plaster façades showed severe frost damages after only one winter. Although the lime was burnt and produced according to old local traditions, the lime mortar was still mixed and worked onaccording to methods developed for lime-cement mortar. This often led to a very porous lime plaster with a lime shell in the surface and such a plaster has been shown to be sensitive to frost expansion. Field studies were combined with laboratory studies of thin section specimens. Optical microscopy and scanning electron microscopy have been important analytical methods showing the porosity and the structure of the binder and aggregate materials. The investigations have been carried out on both historic and on newly made reference mortar and plaster. The field studies were carried out mainly on Gotland, using local materials. The influence of the raw materials, i.e. lime, aggregate and blending ratio was investigated. The focus has been on the workability of the fresh mortars as well as the pore structure of the carbonated plaster. The craftsmanship, meaning mixing and application of mortar and working the plaster surface, was studied in order to clarify its final pore structure. The pore structure in a material determines many of its technical properties, such as moisture transportation, compressive strength, permeability and frost resistance. All these properties are closely connected to the durability of the mortar and plaster. The permeability of the plaster has an impact also on the durability of the covered construction materials. Behind low-permeable plasters made with hydraulic binder, examples of extensive damages of rotten wood and leached lime have been shown. The investigations have shown the importance of choosing a mortar adjusted to the building construction. They also showed the importance of choosing a blending ratio adjusted to the specific binder and sand used in order to get a mortar with a suitable pore structure and good durability. It has also shown the importance of knowing when and how to work on the plaster surface in order to obtain a homogenous material that is well receptive for lime wash and has a good frost resistance. The combination of all the investigations has led to a method for reconstructing historic mortar and plaster with good durability.

Place, publisher, year, edition, pages
Göteborg: Chalmers Tekniska Högskola, 2007. 94 p.
Keyword
lime plaster, lime mortar, masonry, craftsmanship, pore structure, frost resistance, historic mortar
National Category
Natural Sciences
Research subject
Conservation (HGO)
Identifiers
urn:nbn:se:uu:diva-220119 (URN)9789172919907 (ISBN)
Public defence
2007-09-27, Wisby Strand, Visby, 09:00 (Swedish)
Opponent
Supervisors
Funder
Knowledge Foundation
Available from: 2014-04-16 Created: 2014-03-11 Last updated: 2014-04-16Bibliographically approved

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Balksten, Kristin

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