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1.
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2.
Standard Test :
BS EN 10978: 2000 and ASTM E
303
3.
TRRL(Transport Road Research Laboratory)
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This
outstanding contribution to road safety is the result of over 10 years'
intensive development by the Transport Road Research Laboratory (TRRL) of the
Department of Scientific and Industrial Research - a British Government
organization concerned with studying problems that arise in designing,
building, maintaining and using public highways.
The
New Model '
S885' version of the instrument has
been specially strengthened to meet the demands of countries like Germany, who
prefer a more rugged design. Model ' S885¡± also includes an additional scale for use in the
laboratory at no extra cost.
The
instrument which is direct reading, gives a measure of the friction between a
skidding tyre and wet road surface. It provides the Highway Engineer with a
practical means of obtaining reliable scientific evidence on which to take the
appropriate measures to reduce skidding.
To
ensure consistency and maintenance of standard all instruments are submitted to
the British Standards Institute for calibration and approval before supply to
customers.
SPECIFICATION
PORTABLE
SKID RESISTANCE TESTER
Portable
Skid Resistance Tester Outfit comprising Tester, 6 rubber sliders, thermometer,
perspex setting gauge, sale for use in laboratory, 2 spanners, water bottle,
collapsible stool with tool tray, tools and translucent plastic cover, complete
with aluminium transport case. Cat No S885
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Width
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72
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Cms
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Depth
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73
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Cms
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Height
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22
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Cms
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Volume
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0.75
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Cu: metres
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Weight
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29
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Kg
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Aluminium Case
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11
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Kg
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ROADSTONE POLISHING
Studies of accident sites have revealed
that the polishing of roadstone is a major factor in skidding. An important
application of the Skid Tester is in the laboratory determination of the
resistance of roadstone to polishing.
Scale for roadstone polishing is built into
the machine. 6 special small rubber sliders can be supplied for this test:
S886/5
Base Plate for laboratory use of skid
tester with specimen mounting block S885/9
RUBBER SLIDERS
As the nature of the rubber used for
sliders has a critical bearing on the performance for the Tester, and as no
rubber properties can be guaranteed for longer than two years, the date of
issue is marked on each slider.
Spare mounted rubber sliders for use with
Main Tester: S886/6
Spare mounted rubber sliders for Stone
Polishing Tests S886/5
The resistance of wet road surfaces to skidding can be
checked by means of a Portable Skid-resistance Tester (Portable Pendulum
Tester). This apparatus is used to measure the frictional resistance between a
rubber slider (mounted on the end of a pendulum arm) and the road surface. This
method provide a measure of frictional property, microtexture of surfaces,
either in the field or in the laboratory

The quantity measured with the portable tester has
been termed "Skid-resistance" and this correlates with the
performance of a vehicle with patterned tyres braking with locked wheels on a
wet road at 50 km/h.
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