Contribution of the coarse aggregates to rheology - effects of flow coefficient, particle size distribution, and volume fraction
- In order to observe the effect of the aggregate phases between 2 mm and 16 mm without overlap with rheological effects induced by the cement hy-dration and without interactions with a threshold fine sand particle size that affects both, paste and aggregates, rheological experiments were conducted on a limestone filler based paste mixed with aggregates up to 16 mm. Vari-ous aggregate fractions were blended and mixed with the replacement paste in different volumetric ratios. The dry aggregates’ flow coefficients were determined and compared to yield stress and plastic viscosity values at different aggregate volume fractions. The results indicated that the flow coefficient is not a suitable parameter to predict the performance of the aggregates in the paste. It was shown that the yield stress of pastes is largely determined by the blend of different aggregate fractions, while the plastic viscosity to large extend depends upon the coars-est aggregate fraction. Based on the results,In order to observe the effect of the aggregate phases between 2 mm and 16 mm without overlap with rheological effects induced by the cement hy-dration and without interactions with a threshold fine sand particle size that affects both, paste and aggregates, rheological experiments were conducted on a limestone filler based paste mixed with aggregates up to 16 mm. Vari-ous aggregate fractions were blended and mixed with the replacement paste in different volumetric ratios. The dry aggregates’ flow coefficients were determined and compared to yield stress and plastic viscosity values at different aggregate volume fractions. The results indicated that the flow coefficient is not a suitable parameter to predict the performance of the aggregates in the paste. It was shown that the yield stress of pastes is largely determined by the blend of different aggregate fractions, while the plastic viscosity to large extend depends upon the coars-est aggregate fraction. Based on the results, ideal aggregate composition ranges for minimised yield stress are presented. For the plastic viscosity no such grading curves to achieve minimum values could be found, but high viscosity curves are identified.…
Autor*innen: | Wolfram SchmidtORCiD, Alejandra Ramirez Caro, Regine Sojref, Berta Mota Gassó |
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Persönliche Herausgeber*innen: | M. Greim, W. Kusterle, O. Teubert |
Dokumenttyp: | Buchkapitel |
Veröffentlichungsform: | Graue Literatur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Rheologische Messungen an Baustoffen 2018 |
Jahr der Erstveröffentlichung: | 2018 |
Organisationseinheit der BAM: | 5 Werkstofftechnik |
5 Werkstofftechnik / 5.6 Glas | |
7 Bauwerkssicherheit | |
7 Bauwerkssicherheit / 7.4 Baustofftechnologie | |
Herausgeber (Institution): | OTH Regensburg |
Verlag: | tredition GmbH |
Verlagsort: | Hamburg |
Erste Seite: | 96 |
Letzte Seite: | 108 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau |
Freie Schlagwörter: | Cement; Concrete; Flow Coefficient; Limestone Filler; Particle Size Distribution; Reference Material; Rheology; Volume Fraction |
Themenfelder/Aktivitätsfelder der BAM: | Infrastruktur |
ISBN: | 978-3-7469-1878-5 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 12.03.2018 |
Referierte Publikation: | Nein |