A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of test methods and environmental conditions to promote efflorescence formation under laboratory conditions
A major problem facing the masonry industry from an aesthetic standpoint is the formation of efflorescence on the surface of concrete masonry units. The problem is especially pronounced with dark pigmented units. By definition, efflorescence is a surface deposition of water soluble alkalis and alkaline earth compounds from within a parent material that have migrated to and been deposited on an evaporative surface. Several test procedures that induce formation of efflorescence on the surface of porous block specimens were investigated. This paper describes the tests that were investigated and the environ-mental conditions under which these tests were performed. A wicking procedure, run at an elevated temperature and low relative humidity, rapidly produces efflorescence on the surface of test samples. The rate of efflorescence formation was fastest at an elevated temperature and lower relative humidity and slowest at a cool temperature and high relative humidity. The wicking test can be used to rapidly determine the effect of changing mix proportion and the effectiveness of sealers and anti-efflorescence additives on the efflorescence potential of porous masonry units.
Evaluation of test methods and environmental conditions to promote efflorescence formation under laboratory conditions
A major problem facing the masonry industry from an aesthetic standpoint is the formation of efflorescence on the surface of concrete masonry units. The problem is especially pronounced with dark pigmented units. By definition, efflorescence is a surface deposition of water soluble alkalis and alkaline earth compounds from within a parent material that have migrated to and been deposited on an evaporative surface. Several test procedures that induce formation of efflorescence on the surface of porous block specimens were investigated. This paper describes the tests that were investigated and the environ-mental conditions under which these tests were performed. A wicking procedure, run at an elevated temperature and low relative humidity, rapidly produces efflorescence on the surface of test samples. The rate of efflorescence formation was fastest at an elevated temperature and lower relative humidity and slowest at a cool temperature and high relative humidity. The wicking test can be used to rapidly determine the effect of changing mix proportion and the effectiveness of sealers and anti-efflorescence additives on the efflorescence potential of porous masonry units.
Evaluation of test methods and environmental conditions to promote efflorescence formation under laboratory conditions
Die Abschätzung der Testmethoden und der Umgebungsverhältnisse bei beschleunigter Effloreszenzbildung unter Laborbedingungen
Vickers, T. (author) / Moukwa, M. (author)
Journal of Testing and Evaluation ; 24 ; 80-83
1996
4 Seiten, 4 Bilder, 1 Tabelle, 9 Quellen
Article (Journal)
English
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