Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ettringite formation
A crucial step in cement superplasticizer compatibility
AbstractThe rheology of cementitious system containing superplasticizer is the consequence of a physical process due to the electrostatic repulsion between particles, but also of a chemical process linked to the nature of the phases that are formed. Ettringite crystallization play as a key role in this matter and the nature of the sulfate phase added to control cement setting is as important as its dosage. Alkali sulfates, which provide only SO42− ions, do not promote the formation of ettringite for which the presence of large amounts of Ca2+ is necessary. The adsorption of superplasticizer molecules on hydrated cement grains slows down the dissolution rates of the constituents and modifies the nature of the compounds formed. It could result in a modification of the ettringite morphology.
Ettringite formation
A crucial step in cement superplasticizer compatibility
AbstractThe rheology of cementitious system containing superplasticizer is the consequence of a physical process due to the electrostatic repulsion between particles, but also of a chemical process linked to the nature of the phases that are formed. Ettringite crystallization play as a key role in this matter and the nature of the sulfate phase added to control cement setting is as important as its dosage. Alkali sulfates, which provide only SO42− ions, do not promote the formation of ettringite for which the presence of large amounts of Ca2+ is necessary. The adsorption of superplasticizer molecules on hydrated cement grains slows down the dissolution rates of the constituents and modifies the nature of the compounds formed. It could result in a modification of the ettringite morphology.
Ettringite formation
A crucial step in cement superplasticizer compatibility
Prince, W (Autor:in) / Espagne, M (Autor:in) / Aı̈tcin, P.-C (Autor:in)
Cement and Concrete Research ; 33 ; 635-641
21.10.2002
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2003
| Elsevier | 2003
| Online Contents | 2001
| Tema Archiv | 2001
| British Library Online Contents | 2001