Water permeability

Astonishing water permeability (draining ability) that helps against torrential rain and flooding from heavy rains

Astonishing water permeability (draining ability) that helps against torrential rain and flooding from heavy rains.
The water permeability (draining ability) of porous concrete is astonishingly high, so a lot of water poured from a water truck onto it instantaneously and consistently vanishes.

Torrential rainstorms in urban areas, which have been increasing in recent years, have caused serious damage to urban livelihoods. Conventional asphalt, in particular, prevents rainwater from permeating the ground even with torrential or heavy rain, which causes flooding in houses and roads. It’s thought that torrential and heavy rain, which are deeply linked to the environment, will increase further on a global scale. Therefore countermeasures are urgently needed.
In evaluating water permeability (draining ability), the water permeability coefficient is used. To realize high levels of permeability, it’s important to have technology that has both high porosity and the required compression strength.

The astonishing water permeability (draining ability) of porous concrete prevents flooding from torrential and heavy rain in urban areas.

The permeability coefficient of multi-layered porous concrete

The relation of permeability coefficient and total porosity

In evaluating water permeability (draining ability), the water permeability coefficient is used. The excellent water permeability (draining ability) of porous concrete has been proven in results from testing the permeability coefficient and total porosity.
It can be seen that porosity and the permeability coefficient have a proportionate relationship. If the porosity is high, the permeability is also high.
At E-Crete, we’ve achieved a 25 to 30% porosity, 10 to 15 N/mm2 compression strength and a 1 to 3 cm/s permeability coefficient.

Water permeability coefficient (JCI)

This shows how easy water can flow within concrete. The bigger the value, the easier the flow of water.

Part measured	Permeability coefficient
Cylindrical part	2 to 8 cm/s
Core	1 to 3 cm/s
Surface layer	5 to 20 cm/s