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Phosphate-based geopolymers evolve from network reconfiguration to localized motions during curing. This aging process involves densification and heterogeneity, influenced by the Al/P ratio and water content.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Phosphate-based geopolymers are advanced materials with tunable properties.
  • Understanding their time-evolution is crucial for controlling microstructure and mechanical response.

Purpose of the Study:

  • To investigate the dynamics, microstructure, and mechanical behavior of phosphate-based geopolymers during curing.
  • To elucidate the aging mechanisms and the influence of composition on geopolymer evolution.

Main Methods:

  • X-ray photon correlation spectroscopy (XPCS) to probe dynamics and structure.
  • Rheological tests to measure mechanical response and viscosity.

Main Results:

  • Fresh geopolymer mixes show q-independent relaxation, indicating network reconfiguration without mass transport.
  • Curing leads to localized motions, hyperdiffusive dynamics, and structural arrest, signifying heterogeneity and internal stresses.
  • Aging involves densification, formation of hydrated aluminophosphate and silica networks, and decreasing correlation length.
  • Higher Al/P ratio correlates with increased viscosity and kinetics; higher water content shows the opposite trend.

Conclusions:

  • Phosphate-based geopolymers exhibit complex aging dynamics driven by network formation and densification.
  • Composition, particularly the Al/P ratio and water content, significantly impacts geopolymer kinetics and final structure.