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Application of an Improved Empirical Model for Rheology Prediction of Cement Pastes Modified with Filler from Manufactured Sand

Auteur(s): (M. Sc., Ph.D. candidate, Norwegian University of Science and Technology , Department of Structural Engineering , Richard Birkelands vei 1a, 7491 Trondheim , Norway)
(M. Sc., Ph.D., Adj. Associate Professor (NTNU), Senior Project Manager , Norcem AS, Lilleakerveien 2A, 0216 Oslo , Norway)
(Ph.D., Adj. Professor (NTNU), R&D Manager , Norbetong AS, Lilleakerveien 2B, 0216 Oslo , Norway)
(Chief Adviser, Skanska Norge , Lakkegata 53, 0187 Oslo , Norway)
(Ph.D., Associate Professor, Technical University of Denmark , Department of Mechanical Engineering , Building 425, room 224, 2800 Kgs. Lyngby , Denmark)
(Ph.D., Professor, Norwegian University of Science and Technology , Department of Structural Engineering , Richard Birkelands vei 1a, 7491 Trondheim , Norway)
Médium: article de revue
Langue(s): anglais
Publié dans: Nordic Concrete Research, , n. 2, v. 65
Page(s): 1-18
DOI: 10.2478/ncr-2021-0005
Abstrait:

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 = 0.98 for plastic viscosity, = 0.95 for mini slump flow, = 0.91 for flow resistance ratio and = 0.80 for yield stress.

Structurae ne peut pas vous offrir cette publication en texte intégral pour l'instant. Le texte intégral est accessible chez l'éditeur. DOI: 10.2478/ncr-2021-0005.
  • Informations
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  • Reference-ID
    10705814
  • Publié(e) le:
    19.02.2023
  • Modifié(e) le:
    19.02.2023
 
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