Influence of mixing sequence and superplasticiser dosage on the rheological response of cement pastes at different temperatures |
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Authors: | Ví ctor Fernà ndez-Altable,Ignasi Casanova |
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Affiliation: | Group of Mechanics and Nanotechnology of Engineering Materials, Universitat Politècnica de Catalunya, Campus Nord, Building B1, 08034 Barcelona, Catalonia, Spain |
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Abstract: | An experimental methodology to study the rheological response of superplasticised cement pastes subjected to temperatures ranging from 5 to 45 °C is presented. The content of a polycarboxylate-based superplasticiser (PC) and moment of its addition to the mix (direct or delayed) are investigated. A loop of shear rate ramps is applied to each sample in order to obtain information about apparent viscosities and yield stresses, as well as a measure of their thixotropic behaviour. Results from the experimental campaigns indicate PC saturation dosages depend only slightly on temperature. The evolution of yield stress and thixotropy with temperature shows inverted trends under some conditions. |
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Keywords: | Rheology Temperature Cement paste High-range water reducers Polycarboxylate |
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