This test is used to determine the permeability of a water-permeable structure in situ. The apparatus consists mainly of two rings (Ø. 50 and 70 cm), a continuous water supply unit and an automatic system to maintain a constant water level.
The Belgian Road Research Centre (BRRC) has been accredited for a great many tests among other things on soils, aggregates, fillers, binders, asphalt, concrete, and interlayer systems, as well as for camera-assisted sewer inspections.
In this method a constant head of 1 m of water is maintained on the soil. By continuously measuring the water to be added over a duration of at least 20 min, it is possible to determine the permeability of the subgrade soil.
The RCAT (Rotating Cylinder Ageing Test) device was developed to simulate the long-termageing of bituminous binders in an accelerated manner. The method is a conditioning procedure and has no result in itself.
In order to collect information on the reproducibility of the procedure,a limited round robin trial with the RCAT method involving five laboratories and three binders was conducted in 2003. Tests were conducted according to the draft of the RCATmethod (prENxxxxx-RCAT) drawn up in the framework of CENcommittee TC336WG1 TG3.
During this RRT, a health and safety risks assessment was also carried out. The five participating laboratories have rated the residual risks as acceptable.