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W artykule zaprezentowano metodę wielokrotnych skokowych zmian szybkości ścinania oraz model Kembłowskiego i Petery do ilościowej oceny zjawiska tiksotropii zaczynów cementowych bez i z udziałem superplastyfikatora. Wykazano, że model Kembłowskiego i Petery dobrze odwzorowuje wyniki badań eksperymentalnych. W przypadku zaczynu cementowego bez superplastyfikatora poprawność dopasowania wyników modelu...
The complete designing process of High Performance Concrete was conducted. Complete set of test was carried out including testing of rheological properties of cement pastes, mortars compressive strength, aggregate properties, concrete mixture properties and concrete specimens compressive strength. The concrete characterized by compressive strength over 100 MPa was obtained.
The paper presents results of the rheological properties of cement CEM I 42,5R at 15°C. Rheological properties of cement pastes were calculated from the resulting flow curves using various rheological models. The Bingham, Herchel–Bulkley and Casson models were used to estimate the stress strain relations. It was observed that the rheological properties of cement pastes varied with the change of the...
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