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NMR in porous materials

F Milia¹, M Fardis, G Papavassiliou

¹Institute of Materials Science, National Centre for Scientific Research, Demokritos, Athens, Greece. fmilia@artemis.ims.ariadnet.gr

Magnetic Resonance Imaging

|November 6, 1998

Summary

Nuclear magnetic resonance (NMR) probes cement microstructure by measuring water freezing point depression. This technique reveals the pore size distribution within hardened Portland cement pastes, offering insights into cement gel properties.

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Area of Science:

Materials Science
Physical Chemistry
Civil Engineering

Background:

Hardened Portland cement paste microstructure influences durability and performance.
Understanding pore size distribution is crucial for characterizing cementitious materials.
The cement gel, a primary hydration product, significantly impacts material properties.

Purpose of the Study:

To determine the pore size distribution of hardened Portland cement pastes.
To apply nuclear magnetic resonance (NMR) techniques to cementitious materials.
To investigate the microstructure of cement gel using NMR.

Main Methods:

Utilized nuclear magnetic resonance (NMR) spectroscopy.
Employed the principle of freezing point depression of confined water.

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Analyzed the pore size distribution within the cement paste matrix.

Main Results:

Successfully determined the pore size distribution of hardened Portland cement pastes.
Demonstrated the applicability of NMR-based freezing point depression in cementitious systems.
Provided insights into the pore structure of the cement gel.

Conclusions:

NMR-based freezing point depression is a viable method for characterizing cement paste microstructure.
The technique offers a novel approach to probe the pore network of cement hydration products.
This method enhances the understanding of cement gel morphology and its impact on material properties.