Steady viscous flow of some commercial Andean volcanic Portland cement pastes
| Autor: | J. F. Velázquez-Navarro, N.M. Páez-Flor, Francisco Jose Rubio-Hernandez |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Cement
geography Materials science geography.geographical_feature_category Viscoplasticity 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Building and Construction Clinker (cement) 0201 civil engineering law.invention Suspension (chemistry) Portland cement Volcano law Pumice 021105 building & construction General Materials Science Composite material Volcanic ash |
| Zdroj: | Advances in Cement Research. 29:438-449 |
| ISSN: | 1751-7605 0951-7197 |
| Popis: | Three commercial Ecuadorian cements, obtained from crushing a mix of clinker and a mixture of pumice powder and volcanic ash, were selected to perform studies on steady viscous flow behaviour. Steady flow curves were obtained during the dormant period. All pastes showed non-linear viscoplastic behaviour. A modified Bingham model was fitted to the experimental data. The yield stress was found to increase and plastic viscosity decreased with clinker substitution. These results were justified by using a model that considers fresh volcanic cement paste as a suspension of particles (cement and volcanic powder) dispersed in a liquid phase, formed by water, and a gel part, formed from the cement–water chemical reaction. |
| Databáze: | OpenAIRE |
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