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To adapt mortar to new building materials and industrial methods, the content in walls and plaster changed during the 20th century. The change meant that knowledge of historical materials and methods for producing mortar were lost. New research at the University of Gothenburg reveals that historical binding agents and mortar can be produced and used in present-day plaster restorations.
"We need to reclaim this knowledge to care for and preserve historic buildings constructed with other materials than those used today," says Jonny Eriksson at the Department of Conservation at the University of Gothenburg, the author of the new thesis.
Production - Plaster - Mortar - Buildings - Thousands
The production of plaster and mortar for buildings goes back thousands of years in Sweden. For a long time, builders made plaster and mortar using traditional techniques, but with industrialisation the process changed.
"The change involved using new materials and methods to make mortar. At the same time the knowledge of craftspeople on how to make binding agents and mortar for bricklaying and plastering in different situations was lost."
Lack - Knowledge - 1960s - Mortars - Buildings
The lack of knowledge first became apparent late in the 1960s because the new mortars were damaging historic buildings.
"For long-term and sustainable maintenance of historic buildings, we need to reclaim knowledge that has been lost," Jonny Eriksson says. "And this requires collaboration among crafts and professions such as architects, engineers and antiquarians. More craftspeople also need to be trained in research on building conservation."
Thesis - Eriksson - Formation
For his thesis Eriksson investigated the formation...
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