Rheological Properties of Very High-Strength Portland Cement Pastes : Influence of Very Effective Superplasticizers

The influence of the addition of very effective superplasticizers, that are commercially available, employed for maximising the solid loading of very high-strength Portland cement pastes, has been investigated. Cement pastes were prepared from deionized water and a commercially manufactured Portland...

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Bibliographic Details
Published in:International Journal of Chemical Engineering 2010-01, Vol.2010 (2010), p.1-7
Main Authors: Papo, Adriano, Piani, Luciano, Ricceri, Riccardo
Format: Article
Language:English
Subjects:
Atoms & subatomic particles
Cement
Cements
Chemical engineering
Cylinders
Measuring instruments
Melamine resins
Pastes
Physical properties
Portland cements
Rheological properties
Rheology
Superplasticizers
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Summary:The influence of the addition of very effective superplasticizers, that are commercially available, employed for maximising the solid loading of very high-strength Portland cement pastes, has been investigated. Cement pastes were prepared from deionized water and a commercially manufactured Portland cement (Ultracem 52.5 R). Cement and water were mixed with a vane stirrer according to ASTM Standard C305. The 0.38 to 0.44 water/cement ratio range was investigated. Three commercial superplasticizing agents produced by Ruredil S.p.a. were used. They are based on a melamine resin (Fluiment 33 M), on a modified lignosulphonate (Concretan 200 L), and on a modified polyacrylate (Ergomix 1000). Rheological tests were performed at 25°C by using the rate controlled coaxial cylinder viscometer Rotovisko-Haake 20, system M5-osc., measuring device MV2P with serrated surfaces. The tests were carried out under continuous flow conditions. The results of this study were compared with those obtained in a previous article for an ordinary Portland cement paste.
ISSN:1687-806X
1687-8078
DOI:10.1155/2010/682914