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Assessment of the protective effect of carbonation on portlandite crystals

Galan, I. ; Glasser, F.P. ; Baza, D. ; Andrade, C.

Cement and concrete research, 2015-08, Vol.74, p.68-77 [Periódico revisado por pares]

Elsevier Ltd

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Título:
Assessment of the protective effect of carbonation on portlandite crystals
Autor: Galan, I. ; Glasser, F.P. ; Baza, D. ; Andrade, C.
Assuntos: Assessments ; B surface layer ; C carbonation ; C durability ; C permeability ; Calcite ; Calcium carbonate ; Carbonation ; Cements ; Concretes ; D Ca(OH)2 ; Permeation ; Relative humidity
É parte de: Cement and concrete research, 2015-08, Vol.74, p.68-77
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
Descrição: The kinetics of many reactions important to cement hydration and use are not well understood: this is in part due to the great complexity of many supposedly “simple” processes. One such process, carbonation of portlandite, Ca(OH)2, in moist air at ~23°C has been investigated by microscopy and microchemical analysis. Single crystals of portlandite were grown, carbonated at relative humidities between ~25 and ~90%, and the transport properties of the self-generated calcite, CaCO3, product film were determined. The calcite films thus grown within days or weeks varied in thickness but typically were polycrystalline and epitaxial: a variety of morphologies and surface features are recorded. Permeation was measured by determining the time taken for Ca2+ ions, arising from the Ca(OH)2 substrate, to diffuse through the calcite coat into initially pure water. The spontaneous formation of self-protecting films on concrete has long been envisaged: results demonstrate that passivation can actually be achieved.
Editor: Elsevier Ltd
Idioma: Inglês

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Assessment of the protective effect of carbonation on portlandite crystals

Galan, I. ; Glasser, F.P. ; Baza, D. ; Andrade, C.

Elsevier Ltd

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