Application of an Improved Empirical Model for Rheology Prediction of Cement Pastes Modified with Filler from Manufactured Sand
Autor(en): |
Elisabeth Leite Skare
(M. Sc., Ph.D. candidate, Norwegian University of Science and Technology , Department of Structural Engineering , Richard Birkelands vei 1a, 7491 Trondheim , Norway)
Rolands Cepuritis (M. Sc., Ph.D., Adj. Associate Professor (NTNU), Senior Project Manager , Norcem AS, Lilleakerveien 2A, 0216 Oslo , Norway) Ernst Mørtsell (Ph.D., Adj. Professor (NTNU), R&D Manager , Norbetong AS, Lilleakerveien 2B, 0216 Oslo , Norway) Sverre Smeplass (Chief Adviser, Skanska Norge , Lakkegata 53, 0187 Oslo , Norway) Jon Spangenberg (Ph.D., Associate Professor, Technical University of Denmark , Department of Mechanical Engineering , Building 425, room 224, 2800 Kgs. Lyngby , Denmark) Stefan Jacobsen (Ph.D., Professor, Norwegian University of Science and Technology , Department of Structural Engineering , Richard Birkelands vei 1a, 7491 Trondheim , Norway) |
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Medium: | Fachartikel |
Sprache(n): | Englisch |
Veröffentlicht in: | Nordic Concrete Research, Dezember 2021, n. 2, v. 65 |
Seite(n): | 1-18 |
DOI: | 10.2478/ncr-2021-0005 |
Abstrakt: |
There is a need for simple but precise prediction models for proportioning concrete with manufactured sand, for use in ready-mix concrete production. For the last two decades, the particle_matrix model has been used in Norway for proportioning and prediction of concrete flow based on the properties and proportions of two concrete phases: coarse particles and filler modified cement paste (matrix). This paper presents experimental testing of 117 cement pastes of which 107 contain filler, i.e. particles < 125 microns, from manufactured sand. Based on compositions and properties of ingoing materials in these mixes, an empirical equation is developed that predicts the rheological properties plastic viscosity, yield stress, flow resistance ratio and mini slump flow. Optimization by regression analysis provides a practical microproportioning equation that readily can be used as input in concrete proportioning with the particle_matrix model. The equation provides a coefficient of determination R² = 0.98 for plastic viscosity, R² = 0.95 for mini slump flow, R² = 0.91 for flow resistance ratio and R² = 0.80 for yield stress. |
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10705814 - Veröffentlicht am:
19.02.2023 - Geändert am:
19.02.2023