Documents disponibles écrits par cet auteur

Chemo–mechanical modeling for prediction of alkali silica reaction (ASR) expansion / Stéphane Multon in Cement and concrete research, Vol. 39 N° 6 (Juin 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. Martin Cyr Titre : Chemo–mechanical modeling for prediction of alkali silica reaction (ASR) expansion Type de document : texte imprimé Auteurs : Stéphane Multon, Auteur ; Alain Sellier, Auteur ; Martin Cyr, Auteur Année de publication : 2009 Article en page(s) : pp. Martin Cyr Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Alkali-silica  reaction  (ASR);  Particle  size;  Alkali  content;  Expansion;  Model Résumé : The effect of the size of the aggregate on ASR expansion has already been well illustrated. This paper presents a microscopic model to analyze the development of ASR expansion of mortars containing reactive aggregate of different sizes. The attack of the reactive silica by alkali was determined through the mass balance equation, which controls the diffusion mechanism in the aggregate and the fixation of the alkali in the ASR gels. The mechanical part of the model is based on the damage theory in order to assess the decrease of stiffness of the mortar due to cracking caused by ASR and to calculate the expansion of a Representative Elementary Volume (REV) of concrete. Parameters of the model were estimated by curve fitting the expansions of four experimental mortars. The paper shows that the decrease of expansion with the size of the aggregate and the increase of the expansion with the alkali content are reproduced by the model, which is able to predict the expansions of six other mortars containing two sizes of reactive aggregate and cast with two alkali contents. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000702 [article] Chemo–mechanical modeling for prediction of alkali silica reaction (ASR) expansion [texte imprimé] / Stéphane Multon, Auteur ; Alain Sellier, Auteur ; Martin Cyr, Auteur . - 2009 . - pp. Martin Cyr. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 6 (Juin 2009) . - pp. Martin Cyr Mots-clés : Alkali-silica  reaction  (ASR);  Particle  size;  Alkali  content;  Expansion;  Model Résumé : The effect of the size of the aggregate on ASR expansion has already been well illustrated. This paper presents a microscopic model to analyze the development of ASR expansion of mortars containing reactive aggregate of different sizes. The attack of the reactive silica by alkali was determined through the mass balance equation, which controls the diffusion mechanism in the aggregate and the fixation of the alkali in the ASR gels. The mechanical part of the model is based on the damage theory in order to assess the decrease of stiffness of the mortar due to cracking caused by ASR and to calculate the expansion of a Representative Elementary Volume (REV) of concrete. Parameters of the model were estimated by curve fitting the expansions of four experimental mortars. The paper shows that the decrease of expansion with the size of the aggregate and the increase of the expansion with the alkali content are reproduced by the model, which is able to predict the expansions of six other mortars containing two sizes of reactive aggregate and cast with two alkali contents. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000702

Physical and chemical effects of El Hadjar slag used as an additive in cement-based materials / Mourad Behim in European journal of environmental and civil engineering, Vol. 15 N° 10 (Octobre 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 10 (Octobre 2011) . - pp. 1413-1432 Titre : Physical and chemical effects of El Hadjar slag used as an additive in cement-based materials Titre original : Effets physiques et chimiques du laitier d’El Hadjar utilisé comme addition minérale dans les matériaux cimentaires Type de document : texte imprimé Auteurs : Mourad Behim, Auteur ; Martin Cyr, Auteur ; Pierre Clastres, Auteur Année de publication : 2012 Article en page(s) : pp. 1413-1432 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Granulated  blast  furnace  slag  Compressive  strength  Physical  activity  Chemical  activity  Supplementary  cementing  materials  Blended  cement Résumé : Granulated blast furnace slag is currently one of the most important sources of materials for the production of blended cements. Since 1999, the use of slag in France has increased by 52% while the increase in clinker production has not exceeded 13%. In times of shortage, the high demand for slag is not always easy to satisfy, and new sources of supply need to be found. The furnace slag of El Hadjar (Annaba, Algeria) comes into this category. The paper deals with the characteristics and reactivity of this slag. A comparison with European slags shows that, although it fulfills all Standards requirements, the El Hadjarslag has slow reaction kinetics. The activity, measured on the compressive strength of mortars whose binder contains 10 to 100% slag of four finenesses ranging from 2500 to 4000 cm2 /g, strongly depends on the slag fineness. The activity is quantified by using an approach which separates the effect of cement dilution from the physical and chemical effects of the slag. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=17023 [article] Physical and chemical effects of El Hadjar slag used as an additive in cement-based materials = Effets physiques et chimiques du laitier d’El Hadjar utilisé comme addition minérale dans les matériaux cimentaires [texte imprimé] / Mourad Behim, Auteur ; Martin Cyr, Auteur ; Pierre Clastres, Auteur . - 2012 . - pp. 1413-1432. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 10 (Octobre 2011) . - pp. 1413-1432 Mots-clés : Granulated  blast  furnace  slag  Compressive  strength  Physical  activity  Chemical  activity  Supplementary  cementing  materials  Blended  cement Résumé : Granulated blast furnace slag is currently one of the most important sources of materials for the production of blended cements. Since 1999, the use of slag in France has increased by 52% while the increase in clinker production has not exceeded 13%. In times of shortage, the high demand for slag is not always easy to satisfy, and new sources of supply need to be found. The furnace slag of El Hadjar (Annaba, Algeria) comes into this category. The paper deals with the characteristics and reactivity of this slag. A comparison with European slags shows that, although it fulfills all Standards requirements, the El Hadjarslag has slow reaction kinetics. The activity, measured on the compressive strength of mortars whose binder contains 10 to 100% slag of four finenesses ranging from 2500 to 4000 cm2 /g, strongly depends on the slag fineness. The activity is quantified by using an approach which separates the effect of cement dilution from the physical and chemical effects of the slag. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=17023