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Détail de l'auteur
Auteur Mustafa Şahmaran
Documents disponibles écrits par cet auteur
Affiner la rechercheDurability properties of micro-cracked ECC containing high volumes fly ash / Mustafa Şahmaran in Cement and concrete research, Vol. 39 N° 11 (Novembre 2009)
[article]
in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1033–1043
Titre : Durability properties of micro-cracked ECC containing high volumes fly ash Type de document : texte imprimé Auteurs : Mustafa Şahmaran, Auteur ; Victor C. Li, Auteur Année de publication : 2010 Article en page(s) : pp. 1033–1043 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Microcracking ; Durability ; Fly ash ; Self-healing Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : This paper presents the durability of Engineered Cementitious Composites (ECC) that contain high percentages of Class-F fly ash (FA). ECC is a newly developed high performance fiber reinforced cementitious composite with substantial benefit in both high ductility in excess of 3% under uniaxial tensile loading and improved durability due to intrinsically tight crack width. Composites containing two different contents of FA as a replacement of cement (55 and 70% by weight of total cementitious material) are examined after 28 days of curing. Accelerated aging (exposure to continuous sodium hydroxide at 38 °C and sodium chloride solutions at room temperature) and tests of transport properties (salt ponding, rapid chloride permeability and sorptivity tests) are used to study the effect of FA on the durability of the ECC. After accelerated aging, direct tensile tests are performed to evaluate the effect of deterioration on the tensile strength, tensile strain capacity and crack width of ECCs. In addition to virgin specimens, the durability performances of mechanically loaded specimens are also tested. Test results show that both mechanically pre-loaded and virgin (without pre-loading) ECC mixtures with high volumes of FA remain durable in terms of mechanical performances after accelerated aging period, and show a tensile strain capacity of more than 2%. In terms of transport properties, micro-cracks induced by mechanical pre-loading increase the chloride transport and the sorptivity values of ECC. Moreover, increasing FA content is shown to have a negative effect especially on the transport properties of ECC tested in this study. However, the risk of water transport by capillary suction and chloride transport by diffusion in ECC, cracked or uncracked, is found to be comparable with that in normal sound concrete. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001690 [article] Durability properties of micro-cracked ECC containing high volumes fly ash [texte imprimé] / Mustafa Şahmaran, Auteur ; Victor C. Li, Auteur . - 2010 . - pp. 1033–1043.
Génie Civil
Langues : Anglais (eng)
in Cement and concrete research > Vol. 39 N° 11 (Novembre 2009) . - pp. 1033–1043
Mots-clés : Microcracking ; Durability ; Fly ash ; Self-healing Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : This paper presents the durability of Engineered Cementitious Composites (ECC) that contain high percentages of Class-F fly ash (FA). ECC is a newly developed high performance fiber reinforced cementitious composite with substantial benefit in both high ductility in excess of 3% under uniaxial tensile loading and improved durability due to intrinsically tight crack width. Composites containing two different contents of FA as a replacement of cement (55 and 70% by weight of total cementitious material) are examined after 28 days of curing. Accelerated aging (exposure to continuous sodium hydroxide at 38 °C and sodium chloride solutions at room temperature) and tests of transport properties (salt ponding, rapid chloride permeability and sorptivity tests) are used to study the effect of FA on the durability of the ECC. After accelerated aging, direct tensile tests are performed to evaluate the effect of deterioration on the tensile strength, tensile strain capacity and crack width of ECCs. In addition to virgin specimens, the durability performances of mechanically loaded specimens are also tested. Test results show that both mechanically pre-loaded and virgin (without pre-loading) ECC mixtures with high volumes of FA remain durable in terms of mechanical performances after accelerated aging period, and show a tensile strain capacity of more than 2%. In terms of transport properties, micro-cracks induced by mechanical pre-loading increase the chloride transport and the sorptivity values of ECC. Moreover, increasing FA content is shown to have a negative effect especially on the transport properties of ECC tested in this study. However, the risk of water transport by capillary suction and chloride transport by diffusion in ECC, cracked or uncracked, is found to be comparable with that in normal sound concrete. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001690 Internal curing of engineered cementitious composites for prevention of early age autogenous shrinkage cracking / Mustafa Şahmaran in Cement and concrete research, Vol. 39 N° 10 (Octobre 2009)
[article]
in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 893–901
Titre : Internal curing of engineered cementitious composites for prevention of early age autogenous shrinkage cracking Type de document : texte imprimé Auteurs : Mustafa Şahmaran, Auteur ; Mohamed Lachemi, Auteur Année de publication : 2009 Article en page(s) : pp. 893–901 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Autogenous shrinkage; Drying shrinkage; Engineered cementitious composites (ECC); Internal curing; Uniaxial tensile test; Flexural test Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : This investigation was carried out to study the effects of using a replacement percentage of saturated lightweight fine aggregate (LWA) as an internal curing agent on the shrinkage and mechanical behavior of Engineered Cementitious Composites (ECC). ECC is a micromechanically-based, designed high-performance, fiber-reinforced cementitious composite with high ductility and improved durability due to tight crack width. Standard ECC mixtures are typically produced with micro-silica sand (200 µm maximum aggregate size). Two replacement levels of silica sand with saturated LWA (fraction 0.59–4.76 mm) were adopted: the investigation used 10 and 20% by weight of total silica sand content, respectively. For each LWA replacement level, two different ECC mixtures with a fly ash-to-Portland cement ratio (FA/PC) of 1.2 and 2.2 were cast. In a control test series, two types of standard ECC mixtures with only silica sand were also studied. To investigate the effect of replacing a portion of the silica sand with saturated LWA on the mechanical properties of ECC, the study compared the results of uniaxial tensile, flexure and compressive strength tests, crack development, autogenous shrinkage and drying shrinkage. The test results showed that the autogenous shrinkage strains of the control ECCs with a low water-to-cementitious material ratio (W/CM) (0.27) and high volume FA developed rapidly, even at early ages. The results also showed that up to a 20% replacement of normal-weight silica sand with saturated LWA was very effective in reducing the autogenous shrinkage and drying shrinkage of ECC. On the other hand, the partial replacement of silica sand with saturated LWA with a nominal maximum aggregate size of 4.76 mm is shown to have a negative effect, especially on the ductility and strength properties of ECC. The test results also confirm that the autogenous shrinkage and drying shrinkage of ECC significantly decreases with increasing FA content. Moreover, increasing FA content is shown to have a positive effect on the ductility of ECC. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001665 [article] Internal curing of engineered cementitious composites for prevention of early age autogenous shrinkage cracking [texte imprimé] / Mustafa Şahmaran, Auteur ; Mohamed Lachemi, Auteur . - 2009 . - pp. 893–901.
Génie Civil
Langues : Anglais (eng)
in Cement and concrete research > Vol. 39 N° 10 (Octobre 2009) . - pp. 893–901
Mots-clés : Autogenous shrinkage; Drying shrinkage; Engineered cementitious composites (ECC); Internal curing; Uniaxial tensile test; Flexural test Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : This investigation was carried out to study the effects of using a replacement percentage of saturated lightweight fine aggregate (LWA) as an internal curing agent on the shrinkage and mechanical behavior of Engineered Cementitious Composites (ECC). ECC is a micromechanically-based, designed high-performance, fiber-reinforced cementitious composite with high ductility and improved durability due to tight crack width. Standard ECC mixtures are typically produced with micro-silica sand (200 µm maximum aggregate size). Two replacement levels of silica sand with saturated LWA (fraction 0.59–4.76 mm) were adopted: the investigation used 10 and 20% by weight of total silica sand content, respectively. For each LWA replacement level, two different ECC mixtures with a fly ash-to-Portland cement ratio (FA/PC) of 1.2 and 2.2 were cast. In a control test series, two types of standard ECC mixtures with only silica sand were also studied. To investigate the effect of replacing a portion of the silica sand with saturated LWA on the mechanical properties of ECC, the study compared the results of uniaxial tensile, flexure and compressive strength tests, crack development, autogenous shrinkage and drying shrinkage. The test results showed that the autogenous shrinkage strains of the control ECCs with a low water-to-cementitious material ratio (W/CM) (0.27) and high volume FA developed rapidly, even at early ages. The results also showed that up to a 20% replacement of normal-weight silica sand with saturated LWA was very effective in reducing the autogenous shrinkage and drying shrinkage of ECC. On the other hand, the partial replacement of silica sand with saturated LWA with a nominal maximum aggregate size of 4.76 mm is shown to have a negative effect, especially on the ductility and strength properties of ECC. The test results also confirm that the autogenous shrinkage and drying shrinkage of ECC significantly decreases with increasing FA content. Moreover, increasing FA content is shown to have a positive effect on the ductility of ECC. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001665