A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Primer describes a range of products that are used as the first coat wen coating masonry. The primer functions as a sealer and adhesion promoter by blocking alkali and the salts that cause efflorescence. The two basic types of primr are clear and pigmented systems and both exist in solventborne and waterborne versions. Waterborne primers are frequently unable to meet the demanding requirements of the application and a solventborne primer is the only option that can offer the user any guarantee of success. If the primer does not form an effective barrier to alkali, the colour of the masonry paint will change from pink to yellow/white and efflorescence may occur on the 'bad' concrete. Pigmented primers provide a better barrier to alkali than clear primers. Solventborne perform better than waterborne, being less permeable, especially on bad mortar. An important function of a masonry primer is to provide a barrier to the passage of salt preventing efflorescence. Efflorescence is a common problem caused by primary sources of contamination of the cement or by secondary sources from high salt content in the groundwater, which migrate up the wall. Despite some recent developments in waterborne technology to overcome inability to penetrate porous substrates, the evaluation presented here shows that the technology still has a long way to advance before it can be considered as a suitable alternative to solventborne technology.
Primer describes a range of products that are used as the first coat wen coating masonry. The primer functions as a sealer and adhesion promoter by blocking alkali and the salts that cause efflorescence. The two basic types of primr are clear and pigmented systems and both exist in solventborne and waterborne versions. Waterborne primers are frequently unable to meet the demanding requirements of the application and a solventborne primer is the only option that can offer the user any guarantee of success. If the primer does not form an effective barrier to alkali, the colour of the masonry paint will change from pink to yellow/white and efflorescence may occur on the 'bad' concrete. Pigmented primers provide a better barrier to alkali than clear primers. Solventborne perform better than waterborne, being less permeable, especially on bad mortar. An important function of a masonry primer is to provide a barrier to the passage of salt preventing efflorescence. Efflorescence is a common problem caused by primary sources of contamination of the cement or by secondary sources from high salt content in the groundwater, which migrate up the wall. Despite some recent developments in waterborne technology to overcome inability to penetrate porous substrates, the evaluation presented here shows that the technology still has a long way to advance before it can be considered as a suitable alternative to solventborne technology.
Keeping young and beautiful
Jung und schön erhalten
Fream, A. (author)
PPCJ Polymers Paint Colour Journal ; 191 ; 14-15
2001
2 Seiten, 8 Bilder
Article (Journal)
English
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