How to divide the permeability resistance of foam concrete classes?

How to divide the permeability resistance of foam concrete classes?
How to divide the permeability resistance of foam concrete classes?If you have questions, so today we will learn together:
Usually based on permeability test can withstand the water pressure, the permeability resistance of foam concrete can be divided into P4, P6, P8, P10, P12 five grades, etc.
The permeability resistance of concrete with the permeability grade (P) or the coefficient of permeability.USES the permeability grade in China standard.Permeability grade at age 28 d standard specimen, according to the standard test method for testing can withstand the water pressure to determine.GB 50164 "standard of concrete quality control" according to the concrete specimen in the permeability test can withstand the water pressure, the permeability of concrete grade is divided into P4, P6, P8, P10, P12 five grades.Corresponding said concrete impermeability test a group of 6 specimens of four specimens not seeping in the different water pressure.