Water Permeability
Standard(s): EN 12390-8
Lab Test
The Water Permeability test measures the depth of water penetration into hardened concrete when subjected to water pressure. Conducted in accordance with EN 12390-8, the test evaluates the ability of concrete to resist water ingress. This property is an important indicator of durability, particularly for structures exposed to groundwater, water-retaining environments, or harsh weather conditions.

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The Process

A concrete specimen, typically a cube or cylinder, is placed into a specialised test apparatus where water pressure is applied to one face of the sample for a specified period. After the test is complete, the specimen is split open to measure the maximum depth of water penetration. This depth is recorded as the test result and provides an indication of the concrete’s permeability.

The Reason

Concrete that allows water to penetrate too easily may be more susceptible to durability issues such as reinforcement corrosion, freeze–thaw damage, and chemical attack. Measuring water permeability helps assess the quality and density of the concrete and ensures it meets durability requirements for the intended environment.

The Application

Water permeability testing is commonly used for structures where resistance to water ingress is critical, including basements, tunnels, water-retaining structures, foundations, and marine infrastructure. The results help engineers confirm that the concrete mix provides the required level of watertightness and durability.

Frequently Asked Questions

Why is water permeability testing important for concrete structures?

Testing helps determine how resistant concrete is to water ingress, which can affect long-term durability. Amtest testing helps verify that concrete meets the required performance for water-exposed environments.

What type of concrete samples are required for the test?

Water permeability testing is typically carried out on standard concrete cubes or cylinders prepared according to relevant testing standards.

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Water Permeability

The Water Permeability Apparatus is used to assess the depth of water penetration under pressure in concrete specimens. This test is essential for evaluating the concrete’s resistance to water ingress, which can affect the durability and long-term performance of structures.

Testing Procedure

  1. Specimen Preparation: Concrete specimens, typically cubic, cylindrical, or prismatic with a minimum dimension of 150 mm, are prepared and placed between two flanges with special circular gaskets.
  2. Water Application: The specimen is clamped in place, and water is applied to the surface under a controlled pressure.
  3. Measurement of Penetration: After the testing period, the specimen is broken to measure the depth of water penetration. The distance the water has travelled into the concrete indicates its permeability.

Applications

  • Durability Testing: Evaluates concrete’s ability to resist water penetration, essential for structures exposed to wet environments or harsh weather.
  • Quality Control: Helps ensure concrete mixes meet required standards for water resistance.

Conclusion

Water permeability testing is a critical measure of concrete’s resistance to water ingress, helping ensure the longevity and performance of concrete structures exposed to moisture.

EN 12390-8