Characterisation of rendering mortars by squeeze-flow and rotational rheometry

Fabio Cardoso, Vanderley John, Rafael Pileggi, Phillip Frank Gower Banfill

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    This paper reports the first experimental comparison between squeeze-flow at controlled displacement rate and rotational shear at controlled speed for evaluating the rheological behaviour of mortars. Several Brazilian and European rendering products showed a wide range of workability behaviour in both testing modes. The flow curves and hysteresis effects during the shear cycle varied significantly, since the mortar’s composition affects structural breakdown, interfacial slip and phase segregation. The latter plays a critical role during squeeze-flow and is the main reason for the higher loads required to deform the samples at lower rates. A gravimetric-based methodology was developed to assess phase segregation induced by rotational tests. Encouraging agreement between the methods was observed, with yield stress in the structured (unsheared) state showing a good linear correlation. For some mortars showing low segregation it was possible to compare shear viscosity and extensional viscosity and Trouton ratios between 20 and 40 were obtained.
    Original languageEnglish
    Pages (from-to)79-87
    Number of pages9
    JournalCement and Concrete Research
    Early online date1 Jan 2014
    Publication statusPublished - Mar 2014


    • rheology
    • mortar
    • squeeze flow


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