Documents disponibles écrits par cet auteur

Early hydration of clinker–slag–metakaolin combination in steam curing conditions, relation with mechanical properties / F. Cassagnabèrea in Cement and concrete research, Vol. 39 N° 12 (Décembre 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 12 (Décembre 2009) . - pp. 1164-1173 Titre : Early hydration of clinker–slag–metakaolin combination in steam curing conditions, relation with mechanical properties Type de document : texte imprimé Auteurs : F. Cassagnabèrea, Auteur ; M. Mouret, Auteur ; G. Escadeillas, Auteur Année de publication : 2010 Article en page(s) : pp. 1164-1173 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cement/slag/MK  binder  ;  Steam  curing  ;  Early  age;  Hydration  product Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : High strength can be obtained at early ages for precast concrete elements by the use of CEMI 52.5R cement (OPC) and thermal treatment (steam curing). To compensate for the announced withdrawal of CEM I cements because of high CO2 emissions during their production and the ecotax that this will imply, one attractive alternative is the use of composed cements resulting from the combination of clinker with mineral admixtures. In steam curing conditions, previous studies have shown an increase in the compressive strength at one day of age for mortars incorporating an OPC/blast furnace slag (GGBS)/metakaolin (MK) combination, in comparison with mortars incorporating OPC only. The present study investigates the connection between the compressive strength, at one day of age, of steam cured mortars made with various binders and the hydration of these binders. The progress of the hydration was characterised by means of XRD, thermal and microprobe analyses. The results indicate that the increase in compressive strength when MK is incorporated (OPC/MK or OPC/MK/GGBS) can be explained by an increase in the amount of C-S-H, C-A-H, C-A-S-H phases, a decrease in the amount of CH and a change in the chemical nature of the matrix (decrease in C/S ratio). The decrease in compressive strength of OPC/slag-based material can be explained by a reduction in the amount of hydrated phases (particularly C-S-H) and compactness. These are promising results for precast concrete manufacturers who are concerned about preserving the environment. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001859 [article] Early hydration of clinker–slag–metakaolin combination in steam curing conditions, relation with mechanical properties [texte imprimé] / F. Cassagnabèrea, Auteur ; M. Mouret, Auteur ; G. Escadeillas, Auteur . - 2010 . - pp. 1164-1173. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 12 (Décembre 2009) . - pp. 1164-1173 Mots-clés : Cement/slag/MK  binder  ;  Steam  curing  ;  Early  age;  Hydration  product Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : High strength can be obtained at early ages for precast concrete elements by the use of CEMI 52.5R cement (OPC) and thermal treatment (steam curing). To compensate for the announced withdrawal of CEM I cements because of high CO2 emissions during their production and the ecotax that this will imply, one attractive alternative is the use of composed cements resulting from the combination of clinker with mineral admixtures. In steam curing conditions, previous studies have shown an increase in the compressive strength at one day of age for mortars incorporating an OPC/blast furnace slag (GGBS)/metakaolin (MK) combination, in comparison with mortars incorporating OPC only. The present study investigates the connection between the compressive strength, at one day of age, of steam cured mortars made with various binders and the hydration of these binders. The progress of the hydration was characterised by means of XRD, thermal and microprobe analyses. The results indicate that the increase in compressive strength when MK is incorporated (OPC/MK or OPC/MK/GGBS) can be explained by an increase in the amount of C-S-H, C-A-H, C-A-S-H phases, a decrease in the amount of CH and a change in the chemical nature of the matrix (decrease in C/S ratio). The decrease in compressive strength of OPC/slag-based material can be explained by a reduction in the amount of hydrated phases (particularly C-S-H) and compactness. These are promising results for precast concrete manufacturers who are concerned about preserving the environment. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001859