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Détail de l'auteur
Auteur Maria Rita Pires de Carvalho
Documents disponibles écrits par cet auteur
Affiner la rechercheInfluence of steel fibers on the development of alkali-aggregate reaction / Maria Rita Pires de Carvalho in Cement and concrete research, Vol. 40 N° 4 (Avril 2010)
[article]
in Cement and concrete research > Vol. 40 N° 4 (Avril 2010) . - pp. 598–604
Titre : Influence of steel fibers on the development of alkali-aggregate reaction Type de document : texte imprimé Auteurs : Maria Rita Pires de Carvalho, Auteur Année de publication : 2012 Article en page(s) : pp. 598–604 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Alkali-aggregate reaction ;Fiber reinforcement ; Mortar ; AAR accelerated test Résumé : This work presents the results of an experimental research concerning the use of fibers in mortar specimens subjected to alkali-aggregate reaction (AAR). Two types of steel fibers (0.16 mm diameter and 6.0 mm length, and 0.20 mm diameter and 13.0 mm length) were used with fiber volume contents of 1% and 2%. Besides the expansion accelerated tests, compressive tests and flexural tests have also been carried out to display the main mechanical characteristics of the fiber-reinforced mortars after being subjected to AAR. Moreover, the microstructure of the specimens was analyzed by scanning electron microscopy and energy dispersive X-ray. The results shown that the addition of steel fibers reduced the expansion due to AAR for the experimental conditions studied in this paper. The most expressive benefit corresponded to the addition of 13.0 mm fibers in the mixture containing 2% fiber content. This fiber volume content also corresponded to the maximum increment in the mechanical properties compared to the reference mortar, mainly for the post-cracking strength and for the toughness in bending. It was observed that the fibers have a beneficial effect on the material, without compromising its main mechanical properties. En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900338X [article] Influence of steel fibers on the development of alkali-aggregate reaction [texte imprimé] / Maria Rita Pires de Carvalho, Auteur . - 2012 . - pp. 598–604.
Bibliogr.
Langues : Anglais (eng)
in Cement and concrete research > Vol. 40 N° 4 (Avril 2010) . - pp. 598–604
Mots-clés : Alkali-aggregate reaction ;Fiber reinforcement ; Mortar ; AAR accelerated test Résumé : This work presents the results of an experimental research concerning the use of fibers in mortar specimens subjected to alkali-aggregate reaction (AAR). Two types of steel fibers (0.16 mm diameter and 6.0 mm length, and 0.20 mm diameter and 13.0 mm length) were used with fiber volume contents of 1% and 2%. Besides the expansion accelerated tests, compressive tests and flexural tests have also been carried out to display the main mechanical characteristics of the fiber-reinforced mortars after being subjected to AAR. Moreover, the microstructure of the specimens was analyzed by scanning electron microscopy and energy dispersive X-ray. The results shown that the addition of steel fibers reduced the expansion due to AAR for the experimental conditions studied in this paper. The most expressive benefit corresponded to the addition of 13.0 mm fibers in the mixture containing 2% fiber content. This fiber volume content also corresponded to the maximum increment in the mechanical properties compared to the reference mortar, mainly for the post-cracking strength and for the toughness in bending. It was observed that the fibers have a beneficial effect on the material, without compromising its main mechanical properties. En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900338X