BS EN 13036-3:2002 – Road and airfield surface characteristics — Test methods — Part 3: Measurement of pavement surface horizontal drainability

1 Scope
This European Standard describes a method for determining the horizontal drainability of a road surface as an indicator of relatively low surface texture using the outflow meter as a stationary device. The method provides a measure of the drainability in the road/tyre contact area for use on all smooth non porous road surfaces (less than 0,4 mm mean profile depth) either in the field or in the laboratory.
As the method measures the horizontal drainability of a small area of the surface only the selection of the test area should be assessed carefully so that it is representative of the general area on which the measurements are to be made.
2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore hardness).
3 Terms and definitions
For the purposes of this European Standard, the following term and definition apply.
3.1
horizontal drainability
capacity of the road surface texture to provide interconnecting voids through which water can be squeezed out by a moving tyre
4 Safety
When carrying out the test on a jobsite, adequate safety measures shall be in place to maintain a safe working area as the equipment and operator form a stationary obstructive.
5 Principle
The horizontal drainability of relatively smooth surfaces simulates the drainage of water from the contact area beneath a moving vehicle tyre. The outflow meter is placed on the test surface and filled with water. The time required for the water level to fall from an upper to a lower mark is recorded.
6 Apparatus
6.1 Outflow meter
6.1.1 Description of the outflow meter
The outflow meter consists of a cylinder of a solid transparent plastic height (400 ± 1) mm, internal diameter (50 ± 0,5) mm, which is glued to a brass weighting ring (see Figure 1). A brass carrier ring with a precision rubber ring bonded to it (see Figure 2) shall be screwed to the underside of the weighting ring. The total mass of the outflow-meter shall be (3 500 ± 10) g. The mass of the carrier ring shall be (138 ± 3) g. The rubber ring is vulcanised onto the carrier ring. The property of the vulcanised rubber ring shall be as follows:
hardness 48 ± 1, Shore A, in accordance with ISO 868.
The carrier ring shall carry the mark of the manufacturer together with a serial number and the expiry date (month,year) (see Figure 2).
A carrying box with holding devices shall be used for the transport and storage of the apparatus without damage.
The holding devices shall secure that:
the cylinder of the apparatus is not in contact with the inner surface of the top of the carrying box;
the brass weighting ring is laid on a holding device, so that the cylinder is without loading;
the adhesive joint between cylinder and brass weighting ring does not touch any holding device;
the rubber ring does not touch any holding device;
the outflow meter is stored in a vertical position.
BS EN 13036-3:2002 – Road and airfield surface characteristics — Test methods — Part 3: Measurement of pavement surface horizontal drainability