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Influence of clays on the rheology of cement pastes / Nathan A. Tregge in Cement and concrete research, Vol. 40 N° 3 (Mars 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 3 (Mars 2010) . - pp. 384–391 Titre : Influence of clays on the rheology of cement pastes Type de document : texte imprimé Auteurs : Nathan A. Tregge, Auteur ; Margaret E. Pakula, Auteur Année de publication : 2012 Article en page(s) : pp. 384–391 Note générale : Bibliogr. Langues : Anglais (eng) Mots-clés : Clay;  Fresh  concrete;  Rheology;  Cement  paste;  Flocculation Résumé : The fresh state of concrete is becoming increasingly important in furthering the types of applications of today's construction world. Processing techniques have resulted in technologies such as self-consolidating concrete and depend on the microstructural changes that take place during and immediately after mixing and placing. These changes to the microstructure reflect the flocculation behavior between the particles in suspension. The ability to modify this behavior allows control over the balance among flowability and shape-stability of concrete. This study investigates how clay admixtures affect the microstructure of cement pastes from a rheological stand point. Shear and compressive rheology techniques are used to measure how the solids volume fraction of suspensions with different admixtures evolves with stress. Based on these relationships, the effectiveness of clays on the balance between flowability and shape-stability is measured. Results are consistent with green strength tests performed on concrete mixes derived from the cement paste mixes. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609003160 [article] Influence of clays on the rheology of cement pastes [texte imprimé] / Nathan A. Tregge, Auteur ; Margaret E. Pakula, Auteur . - 2012 . - pp. 384–391. Bibliogr. Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 3 (Mars 2010) . - pp. 384–391 Mots-clés : Clay;  Fresh  concrete;  Rheology;  Cement  paste;  Flocculation Résumé : The fresh state of concrete is becoming increasingly important in furthering the types of applications of today's construction world. Processing techniques have resulted in technologies such as self-consolidating concrete and depend on the microstructural changes that take place during and immediately after mixing and placing. These changes to the microstructure reflect the flocculation behavior between the particles in suspension. The ability to modify this behavior allows control over the balance among flowability and shape-stability of concrete. This study investigates how clay admixtures affect the microstructure of cement pastes from a rheological stand point. Shear and compressive rheology techniques are used to measure how the solids volume fraction of suspensions with different admixtures evolves with stress. Based on these relationships, the effectiveness of clays on the balance between flowability and shape-stability is measured. Results are consistent with green strength tests performed on concrete mixes derived from the cement paste mixes. En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609003160