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Related Experiment Videos

Water transport in concrete

J Link1, J Kaufmann, K Schenker

  • 1Spectrospin AG, Fällanden, Switzerland.

Magnetic Resonance Imaging
|January 1, 1994
PubMed
Summary

This study reveals that chloride transport in concrete is less deep than previously modeled. Using deuterium MRI, researchers found water uptake depends on pre-storage conditions, suggesting a refined concrete deterioration model.

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Geophysics

Background:

  • Chloride contamination significantly contributes to concrete deterioration.
  • Traditional methods for assessing chloride transport rely on weight-vs.-time analysis of immersed samples.
  • Existing models assume capillary flow and a distinct transport front, often overestimating penetration depths.

Purpose of the Study:

  • To investigate the accuracy of current concrete deterioration models.
  • To evaluate water transport mechanisms and penetration depth in concrete.
  • To explore the influence of pre-storage conditions on water uptake.

Main Methods:

  • Utilized Magnetic Resonance Imaging (MRI) for tomographic analysis of water uptake.
  • Employed deuterated water and deuterium MRI to eliminate background signals and enhance imaging.
  • Analyzed water penetration and exchange depth within concrete samples.

Main Results:

  • Empirical evidence indicates a reduced water exchange depth compared to model predictions.
  • Water uptake depth is demonstrably dependent on the concrete's pre-storage conditions.
  • The findings challenge the assumptions of strictly capillary flow and well-defined transport fronts.

Conclusions:

  • Current models for chloride transport in concrete require refinement.
  • The study highlights the importance of considering pre-storage conditions in predicting concrete durability.
  • MRI offers a powerful tool for understanding complex transport phenomena in porous materials like concrete.

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