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Influence of bleed water reabsorption on cement paste autogenous deformation / B.J. Mohr in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 220-225 Titre : Influence of bleed water reabsorption on cement paste autogenous deformation Type de document : texte imprimé Auteurs : B.J. Mohr, Auteur ; K.L. Hood, Auteur Année de publication : 2010 Article en page(s) : pp. 220-225 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Shrinkage  Expansion  Stability  Bleeding  Admixture Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The effects of bleed water reabsorption and subsequent early age expansion on observed autogenous deformation are investigated in this research. Bleeding was induced by varying superplasticizer and shrinkage-reducing admixture dosages and by increasing the water-to-cement ratio. This research revealed that significant early age expansion occurs with increasing chemical admixture dosages and higher water-to-cement ratios, as expected, due to increasing bleeding of those samples. When samples were rotated, negligible early age expansion was observed. Thus, bleed water reabsorption is shown to be the primary mechanism causing initial expansion in sealed autogenous deformation samples. Thermal dilation and ettringite growth appear to have a minimal influence on the observed expansion. Rotating the samples during setting eliminates the potential for bleed water reabsorption and is recommended for all autogenous deformation testing. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XMC05Y-2&_user=6 [...] [article] Influence of bleed water reabsorption on cement paste autogenous deformation [texte imprimé] / B.J. Mohr, Auteur ; K.L. Hood, Auteur . - 2010 . - pp. 220-225. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 220-225 Mots-clés : Shrinkage  Expansion  Stability  Bleeding  Admixture Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The effects of bleed water reabsorption and subsequent early age expansion on observed autogenous deformation are investigated in this research. Bleeding was induced by varying superplasticizer and shrinkage-reducing admixture dosages and by increasing the water-to-cement ratio. This research revealed that significant early age expansion occurs with increasing chemical admixture dosages and higher water-to-cement ratios, as expected, due to increasing bleeding of those samples. When samples were rotated, negligible early age expansion was observed. Thus, bleed water reabsorption is shown to be the primary mechanism causing initial expansion in sealed autogenous deformation samples. Thermal dilation and ettringite growth appear to have a minimal influence on the observed expansion. Rotating the samples during setting eliminates the potential for bleed water reabsorption and is recommended for all autogenous deformation testing. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XMC05Y-2&_user=6 [...]