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Long-term performance of cement paste during combined calcium leaching-sulfate attack: kinetics and size effect |
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| Authors: | D Planel P Le Bescop J-M Torrenti |
| Affiliation: | a Centre d'Etudes et de Recherches de l'Industrie du Béton, Département Matériaux, Laboratoire Microstructure, BP 59, 28231 Epernon Cedex, France b Atomic Energy Commission, Laboratoire d'Etude du Comportement des Bétons et des Argiles, 91191 Gif-sur-Yvette, France c Atomic Energy Commission, Laboratoire d'Étude du Comportement Physico-chimique des Colis, 13108 Saint-Paul-Lez-Durance, France d Ecole Nationale des Ponts et Chaussée, Cité Descartes, 77455 Marne-La-Vallée Cedex 2, France |
| Abstract: | This paper presents experimental results obtained on cement paste samples (water/cement ratio of 0.4) subjected to a low-concentration (15 mmol/l) external sulfate attack during several weeks. Chemical and microstructural analyses include the continuous monitoring of calcium loss and sulfate consumption within the cement paste, periodic layer by layer X-ray diffraction (XRD)/energy-dispersive spectrometer (EDS) analyses of the solid constituents of the cement matrix (ettringite, portlandite, gypsum) within the calcium-depleted part of the samples. Scanning electron microscopy (SEM) and visual observations are used to follow the crack pattern evolution during the external sulfate attack. The relation between the size of the specimen and crack initiation/development is investigated experimentally by performing tests on samples with different thickness/diameter ratios. |
| Keywords: | Cement paste Long-term performance Sulfate attack Ettringite Microcracking |
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