The GWT measures the permeation of water into the test surface under an applied pressure. A pressure chamber containing a watertight gasket is secured tightly to the surface by two anchored clamping pliers or by means of a suction plate.
The chamber is filled with water and the top cap of the chamber is turned until a desired water pressure is displayed on the gauge. As water permeates into the concrete, the selected pressure is maintained by means of a micrometer gauge pushing a piston into the chamber. The piston movement compensates for the volume of water penetrating into the material.
The travel of the piston as a function time is recorded and the speed the piston travel in µm/s is used to characterize the permeation of the test surface in different ways.

Water Permeability Test.

Evaluation of:

• Water permeation of the skin-concrete in finished structure
• Water permeation of masonry panels
• Water tightness of construction joints and sealed control joints
• Effectiveness of waterproofing admixtures, additives, membranes, coatings or other surface applied compounds
• Approximate estimation of the coefficient of water permeability of concrete or other material alike by the penetration method.

Water Permeability Test.

• Lightweight, handheld equipment, easy to operate in the lab and in-situ
• Strong aluminum/stainless steel chamber
• Kit includes 2 pressure gauges
• 5 bar (500 kPa) maximum pressure
• High precision micrometer for registering water volume
• 2 types of watertight gaskets for different surface conditions.

Water Permeability Test.

GWT-4000 Kit

Includes:

To be ordered separately

Item	Order #
Laboratory Kit (a). Set of extension rods, clamps and bench for testing on 150 x 300 mm or 100 x 200 mm cylinders, and on 150 mm cubes	GWT-4260
Suction plate & vacuum pump (b) for testing without anchoring	GWT-4230
Hammer drill machine	GWT-4240

• Technical data-sheet 
• Publications

More documentation is available upon request.

No standards available for this system.