Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Proceq SRT 5800
Summary of Contents for Proceq SRT 5800
- Page 1 SRT 5800 Portable Skid Resistance Tester...
-
Page 3: Table Of Contents
Nevertheless, errors can not entirely be eliminated. The manufacturer shall not be liable for errors contained herein or for incidental or consequential damages resulting from possible errors. We would therefore welcome any suggestions and references to errors. © Proceq SA page 3... -
Page 4: Introduction
1. Introduction A portable tester, shown in Plate 1, was developed at the Road Research Laboratory (now TRRL) some years ago to provide highway engineers with a routine method of checking the resistance of wet road surfaces to skidding. The apparatus measures the frictional resistance between a rubber slider (mounted on the end of a pendulum arm) and the road surface. - Page 5 is then brought round to its stop in line with the pendulum arm. The pendulum arm is released by pressing button C. The pointer is carried with the pendulum arm on the forward swing only. Catch the pendulum arm on its return swing, and note the pointer reading.
- Page 6 Operation of tester (wet conditions) Wet the road surface and slider, ensuring that the road surface is free from loose grit. (ii) Bring the pointer round to its stop. Release the pendulum arm by pressing button C and catch it on the return swing, before the slider strikes the road surface.
-
Page 7: Factors Affecting Results
3. Factors affecting results Like all skidding machines, the portable tester can only be used to the best advantage with a full knowledge of the factors influencing skidding resistance, and results must be interpreted with due consideration for all conditions obtaining at the time of the tests. - Page 8 Because the portable tester indicates the performance of patterned tyres at relatively low speeds, it is important to record the surface texture or appearance of each road surface tested. On roads where speeds are low it is sufficient to classify the texture from visual inspection. Plate 2 shows typical surfaces classified as follows: Plate 2 (a) and (b): rough-textured surfaces where tyre tread pattern would have a negligible effect;...
- Page 9 mainly because of the changes in road surface texture. As a rough guide, however, an average temperature correction evaluated for a range of surface textures is given in Fig. 1. From this it is apparent that a correction for the effect of temperature only becomes important for tests made at temperatures below 10°C, and then its main use is to give a more accurate assessment of the skidding...
- Page 10 To help in interpreting results, therefore, the temperature of the water lying on the road immediately after test should be recorded. It must be stressed, however, that the change in state of polish of road surfaces throughout the year is a much bigger factor determining changes in 'skid-resistance' than is the change in temperature;...
-
Page 11: Plate 1: Portable Skid-Resistance Tester
4. Plate 1: Portable skid-resistance tester page 11... -
Page 12: Plate 2: Typical Surfaces
5. Plate 2: Typical surfaces Rough-textured surfaces Medium-textured surfaces Smooth-textured surfaces Typical surfaces having rough-, medium-, smooth-textured appearance (Approx ½ size) -
Page 13: Plate 3: Tester Supported On A Small Carrying Board
6. Plate 3: Tester supported on a small carrying board page 13... -
Page 14: Plate 4: Camera Unit For Photographing Road Surfaces
7. Plate 4: Camera unit for photographing road surfaces... - Page 15 Maintenance of tester The testers have been designed so that the minimum amount of maintenance is required. One or two parts, however, need some attention. Sliders should be renewed when the sliding edge becomes burred or rounded. One slider edge can normally be used for at least 100 different settings (500 swings).
-
Page 17: Transporting The Apparatus
8. Transporting the apparatus In transporting the apparatus it may sometimes be convenient to remove the swinging arm from the head; this may be done quite easily by undoing nut G. In a similar way, to reduce the width of the apparatus (for example, when packing it in a case), the rear leg of the base may be swung sideways by removing the fixing nut H and loosening the pivot nut J. - Page 18 10. Appendix 1 The measurement of texture depth by the sand patch method Apparatus and material This consists of: A pair of dividers capable of measuring radii up to 20 cm. A rule marked off in mm. A cylinder 8 cm high with an internal diameter of 2 cm.* A flat wooden disc of 6½-cm diameter with a hard rubber disc of the same diameter stuck to one face;...
- Page 19 With the dividers measure the radius of the patch formed by the sand and record to the nearest mm. Carry out a number of tests at intervals along a line parallel to the kerb as required. *Suitable only for texture depths greater than 0-25 mm; a smaller cylinder and finer sand are recommended for measurements on smoother surfaces.
- Page 20 Appendix A simple camera unit for photographing road surfaces Requirements Methods of photographing road surfaces have been described elsewhere but the camera units used are not suitable for use by a skidding team. Such a team requires a relatively small unit which can be carried in one piece in a car or light van, is easily transportable from one section to an adjacent section of road, and is.
- Page 21 quick and easy to operate. The unit described in this Appendix fulfils these requirements and, although some of the high-quality finish of the photographs produced by the more elaborate apparatus is lost, the reproduction obtained is quite satisfactory for record purposes. Description of apparatus The camera unit, which is shown in Plate 4, consists of a camera with a 120 roll-film back mounted vertically with its focusing plate 55 cm...
- Page 24 Subject to change. Copyright © 2017 by Proceq SA, Schwerzenbach. All rights reserved. www.proceq.com Version 1.2...