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Enhancing Printable Concrete Thixotropy by High Shear Mixing

  • Aileen VandenbergEmail author
  • Hela Bessaies-Bey
  • Kay Wille
  • Nicolas Roussel
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 19)

Abstract

Our results show that the storage elastic modulus as a function of time increases at a higher rate for cement paste mixed at higher vesus lower mixing intensity. Hence, higher mixing appears to be enhancing thixotropy. Using calorimetry analysis we find that higher mixing decreases the setting time and enhances the peak of the heat flow. By analyzing the nanoparticles present in the suspending fluid of the cement paste, we show, in accordance with literature, that an appropriate combination of mixing energy and super-plasticizer dosage promotes hydration by scratching hydrates from the surface of cement particles, stabilizing them in the suspending fluid and hence generating additional nucleation surfaces. These results open the door for the design of printing heads including high-shear micro mixers allowing for a faster liquid-to-solid transition of the printable material.

Keywords

Thixotropy Nanoparticles Mixing Cement Calorimetry DLS 

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Copyright information

© RILEM 2019

Authors and Affiliations

  • Aileen Vandenberg
    • 1
    Email author
  • Hela Bessaies-Bey
    • 2
  • Kay Wille
    • 1
  • Nicolas Roussel
    • 2
  1. 1.University of ConnecticutStorrsUSA
  2. 2.IFSTTARMarne-La-ValléeFrance

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