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Materials and Structures

, 52:5 | Cite as

Relating early hydration, specific surface and flow loss of cement pastes

  • Sara Mantellato
  • Marta Palacios
  • Robert J. Flatt
50 years of Materials and Structures
  • 171 Downloads
Part of the following topical collections:
  1. 50 years of Materials and Structures

Abstract

Flow loss in superplasticized systems has been mainly explained in qualitative and comparative ways over the past years. This is due to the intrinsic complexity of the underlying mechanism involving a change in the agglomeration degree as a result of cement hydration. The lack of robust and reliable experimental methodologies must have additionally discouraged researchers from attempting to understand the phenomena of flow loss in quantitative terms. Thanks to new analytical methods, it was possible to prove that after the so-called onset point, yield stress increases exponentially with the increase of both heat rate measured by isothermal calorimetry and specific surface. This paper also identifies the existence of a direct proportionality between the increase of heat rate and the increase of specific surface area during the acceleration period, most likely reflecting the nucleation and growth nature at this stage of the cement hydration.

Keywords

Superplasticizers Yield stress Heat rate Isothermal calorimetry BET model 

Notes

Acknowledgements

Funding for Sara Mantellato was provided by the SNSF Project (No. 140615) titled “Mastering flow loss of cementitious systems” and the SNSF National Centre for Competence in Research in Digital Fabrication—Innovative Building Processes in Architecture. The authors wish to thank Lukas Frunz (SIKA AG Schweiz) for providing the polymers and Giulia Gelardi (ETH Zürich) for their characterization.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11527_2018_1304_MOESM1_ESM.pdf (94 kb)
Supplementary material 1 (PDF 95 kb)
11527_2018_1304_MOESM2_ESM.pdf (135 kb)
Supplementary material 2 (PDF 135 kb)
11527_2018_1304_MOESM3_ESM.pdf (139 kb)
Supplementary material 3 (PDF 140 kb)

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Copyright information

© RILEM 2019

Authors and Affiliations

  1. 1.Institute for Building MaterialsETH ZürichZurichSwitzerland
  2. 2.Eduardo Torroja Institute for Construction ScienceMadridSpain

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