Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid Fraction
Rheological characterisation of mortar is complicated by phenomena of slip, the formation of shear bands and depletion. At relatively low solid fractions a typical Couette geometry and a medium-size mixer-type rheometer were used to determine flow curves. At higher solid fractions a large-size coaxi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2009-10-01
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| Series: | Applied Rheology |
| Subjects: | |
| Online Access: | https://doi.org/10.3933/applrheol-19-52550 |
| _version_ | 1818582156950110208 |
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| author | Hendrickx Roel Rezeau Martin Van Balen Koenraad Van Gemert Dionys |
| author_facet | Hendrickx Roel Rezeau Martin Van Balen Koenraad Van Gemert Dionys |
| author_sort | Hendrickx Roel |
| collection | DOAJ |
| description | Rheological characterisation of mortar is complicated by phenomena of slip, the formation of shear bands and depletion. At relatively low solid fractions a typical Couette geometry and a medium-size mixer-type rheometer were used to determine flow curves. At higher solid fractions a large-size coaxial cylinder rheometer with multiple blade vane geometry was used up to the point where slippage occurred. The viscosity as a function of concentration responds to the Krieger-Dougherty law, when a mortar is considered as a suspension of sand in a matrix of binder slurry. The limits of this description corresponds to a critical solid fraction above which air is entrapped during the mixing procedure: air content measurements demonstrate this phenomenon. A clear relationship between mortar and slurries was established, based on the measured properties of both binder and sand particles, and on the Farris model for polydisperse suspensions. Intrinsic viscosity can be used as a tool to evaluate shape characteristics of the binder particles. A procedure for mixture optimisation of mortars using this model is demonstrated for the case of a trimodal mortar. |
| first_indexed | 2024-12-16T07:44:55Z |
| format | Article |
| id | doaj.art-214ec6914f794ecb9bdafeeeac7ee856 |
| institution | Directory Open Access Journal |
| issn | 1617-8106 |
| language | English |
| last_indexed | 2024-12-16T07:44:55Z |
| publishDate | 2009-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Applied Rheology |
| spelling | doaj.art-214ec6914f794ecb9bdafeeeac7ee8562022-12-21T22:39:00ZengDe GruyterApplied Rheology1617-81062009-10-0119552550-152550-1210.3933/applrheol-19-52550Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid FractionHendrickx Roel0Rezeau Martin1Van Balen Koenraad2Van Gemert Dionys3Katholieke Universiteit Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001Heverlee, BelgiumKatholieke Universiteit Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001Heverlee, BelgiumKatholieke Universiteit Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001Heverlee, BelgiumKatholieke Universiteit Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001Heverlee, BelgiumRheological characterisation of mortar is complicated by phenomena of slip, the formation of shear bands and depletion. At relatively low solid fractions a typical Couette geometry and a medium-size mixer-type rheometer were used to determine flow curves. At higher solid fractions a large-size coaxial cylinder rheometer with multiple blade vane geometry was used up to the point where slippage occurred. The viscosity as a function of concentration responds to the Krieger-Dougherty law, when a mortar is considered as a suspension of sand in a matrix of binder slurry. The limits of this description corresponds to a critical solid fraction above which air is entrapped during the mixing procedure: air content measurements demonstrate this phenomenon. A clear relationship between mortar and slurries was established, based on the measured properties of both binder and sand particles, and on the Farris model for polydisperse suspensions. Intrinsic viscosity can be used as a tool to evaluate shape characteristics of the binder particles. A procedure for mixture optimisation of mortars using this model is demonstrated for the case of a trimodal mortar.https://doi.org/10.3933/applrheol-19-52550mortarpasteslurrypolydispersityair entrappmentsolid fraction |
| spellingShingle | Hendrickx Roel Rezeau Martin Van Balen Koenraad Van Gemert Dionys Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid Fraction Applied Rheology mortar paste slurry polydispersity air entrappment solid fraction |
| title | Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid Fraction |
| title_full | Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid Fraction |
| title_fullStr | Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid Fraction |
| title_full_unstemmed | Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid Fraction |
| title_short | Mortar and Paste Rheology: Concentration, Polydispersity and Air Entrapment at High Solid Fraction |
| title_sort | mortar and paste rheology concentration polydispersity and air entrapment at high solid fraction |
| topic | mortar paste slurry polydispersity air entrappment solid fraction |
| url | https://doi.org/10.3933/applrheol-19-52550 |
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