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Mechanism of concrete deterioration due to salt crystallization

Thaulow, Niels / Sahu, Sadananda

Surface scaling of concrete is observed due to salt crystallization. The salts present on concrete as efflorescence or subflorescence are usually highly soluble in water. The most common efflorescent material is anhydrous sodium sulfate (Na₂SO₄, thenardite) and hydrous sodium sulfate (Na₂SO₄ dot 10H₂O, mirabilite). Various mechanisms have been proposed concerning the cause of this form of deterioration: (a) the solid volume change from the thenardite to mirabilite; (b) salt hydration pressure; and (c) the salt crystallization pressure. All three mechanisms are reviewed and discussed in the present paper.

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Mechanism of concrete deterioration due to salt crystallization

Thaulow, Niels / Sahu, Sadananda

Surface scaling of concrete is observed due to salt crystallization. The salts present on concrete as efflorescence or subflorescence are usually highly soluble in water. The most common efflorescent material is anhydrous sodium sulfate (Na₂SO₄, thenardite) and hydrous sodium sulfate (Na₂SO₄ dot 10H₂O, mirabilite). Various mechanisms have been proposed concerning the cause of this form of deterioration: (a) the solid volume change from the thenardite to mirabilite; (b) salt hydration pressure; and (c) the salt crystallization pressure. All three mechanisms are reviewed and discussed in the present paper.

Mechanism of concrete deterioration due to salt crystallization

Thaulow, Niels / Sahu, Sadananda

Surface scaling of concrete is observed due to salt crystallization. The salts present on concrete as efflorescence or subflorescence are usually highly soluble in water. The most common efflorescent material is anhydrous sodium sulfate (Na₂SO₄, thenardite) and hydrous sodium sulfate (Na₂SO₄ dot 10H₂O, mirabilite). Various mechanisms have been proposed concerning the cause of this form of deterioration: (a) the solid volume change from the thenardite to mirabilite; (b) salt hydration pressure; and (c) the salt crystallization pressure. All three mechanisms are reviewed and discussed in the present paper.

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Title:

Mechanism of concrete deterioration due to salt crystallization

Contributors:

Thaulow, Niels (author) / Sahu, Sadananda (author)

Published in:

EMABM, Euroseminar on Microscopy Applied to Building, 9 ; 123-127

Materials Characterization ; 53

Publication date:

2004

Size:

5 Seiten, 12 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.matchar.2004.08.013

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

anorganisches Salz , Kristallisation , Effloreszenz , Löslichkeit , Hydratisieren , Druckeinfluss , Natriumhydrogensulfat , Additiv , Beton

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