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Definitions & History

What are Gel pores?

Gel pores: These are interconnected interstitial spaces between the gel particles. The gel pores occupy about 28% of the total volume of gel. 

Gel pores are much smaller in size than capillary pores with Size normally between 0.5 and 2.5 nm

Have Little impact on strength and permeability

Can influence shrinkage and creep

Total volume of gel pores increases alongwith the volume of gel as the hydration proceeds. However, the volume of capillary pores decreases with the progress of hydration.

Schematic diagram of concrete paste microstructure at the boundary of an air void:

The solid portion of the hydrated cement gel is depicted as small black spheres. The interstitial spaces between the spheres are the gel pores. The capillary pores are denoted with a “C.”

 

 

 

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