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A platform for research: civil engineering, architecture and urbanism
Ettringite formation: A crucial step in cement superplasticizer compatibility
The 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 Ca 2+ 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
The 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 Ca 2+ 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. (author) / Espagne, M. (author) / Aitcin, P.C. (author)
Cement and Concrete Research ; 33 ; 635-641
2003
7 Seiten, 18 Quellen
Article (Journal)
English
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