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Hemp-lime case studies: (a) Hemp-lime test surface in Örgryte new church, Gothenburg; (b) test wall of brick with sodium sulphate at Lund University; (c) section of the test wall: 1. Lime plaster, 2. Hemp-lime 100 mm, 3. Lime finish, 4. Brick saturated with sodium sulphate.

Understanding Deterioration due to Salt and Ice Crystallization in Scandinavian Massive Brick Masonry

Bild: Hemp-lime case studies: (a) Hemp-lime test surface in Örgryte new church, Gothenburg; (b) test wall of brick with sodium sulphate at Lund University; (c) section of the test wall: 1. Lime plaster, 2. Hemp-lime 100 mm, 3. Lime finish, 4. Brick saturated with sodium sulphate.

Open acess paper i Heritage
Understanding Deterioration due to Salt and Ice Crystallization in Scandinavian Massive Brick Masonry
Författare; Paulien Strandberg och Kristin Balksten, 8 Februari 2021.

”Att förebygga saltutfällning genom hampa-kalk puts i äldre tegelbyggnader” är ett projekt inom Spara och bevara etapp IV.
En del i projektet är en vägg som har byggts upp på LTH. I artikeln beskrivs denna vägg närmare.

Abstract

”Extensive durability problems such as weathering and degradation are found in historic Scandinavian brick masonry buildings, especially from the neo-Gothic period. These are largely due to the crystallization of salts and frost action in the bricks and mortars. This article aims to show and illustrate which salts and crystals are found in historic brick masonry buildings and to describe their appearance and behavior. An additional aim is to explore possibilities of preventing salt-related damage on internal masonry wall surfaces, such as using hemp-lime sacrificial plaster beneath the plaster. The objective is to show the mechanisms behind salt-related problems and to perform a case study and a laboratory study on salt-damaged brick masonry containing sodium sulphate. In order to prevent and stop damage to the masonry, it is important to be able to identify the nature of the salt damage and the type of salt that caused the damage. Neo-Gothic brick masonry buildings require well-planned, continuous maintenance of the masonry. It is therefore of the utmost importance to have an understanding of the complex functions of the masonry and of the salts that can cause damage to these historic buildings”.

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