The Pendulum Skid Resistance Tester was originally designed in the 40s in the USA, and further developed in the 1960s at the TRL (Transport Research Laboratory) for the testing of road surfaces.
The device measures the frictional resistance between a rubber slider mounted on the end of a pendulum arm and the surface to be tested. This provides road engineers with a method of checking the resistance of wet and dry surfaces to slipping and skidding, both in the lab and insitu.
It operates by a pendulum rotating about a spindle which is attached to a vertical pillar. At the end of the tubular arm a head of known mass is fitted with a rubber slider. The pendulum is released from a horizontal position so that it strikes the sample surface at a constant speed. The distance travelled by the head after hitting the sample is determined by the friction of the sample surface.
|42-6000/12||3.00” Rubber Mounted TRL (55) Slider||info »|
|42-6000/13||3.00” Rubber Mounted Four S (96) Slider||info »|
|42-6200||Base Plate for Skid Resistance Tester for lab testing||info »|
|42-6000/11||1.25” Rubber Mounted PSV Slider||info »|
|42-6000/14||3.00” Rubber Mounted CEN Slider||info »|
|42-6000/10||Set of 3 Spreader Feet for Skid Resistance Tester for in-situ testing||info »|
|42-6000||Pendulum Skid Resistance Tester||info »|
• Lightweight construction
• Compact, telescopic design
• Direct reading of deflection
• Anti-vibration system
Designed for maximum operator efficiency, the Benkelman Beam is manufactured from a lightweight, durable material which telescopes into a small, compact unit for ease of storage and transport.
|47-1460||Benkelman Beam||info »|
The main purpose of a surface dressing is to prevent weathering, disintegration of the pavement and to increase the resistance to skidding in wet weather. The rate of spread and application of the chippings and binder is specified for most applications. Test methods have been developed to determine the actual rate of spread and are described in British Standards.
The equipment comprises a tray 300 mm square which, when used in conjunction with a specially calibrated spring balance, will determine the rate of spread of coated chippings in terms of kg/m2. The spring loaded balance will accept rates of spread between 4 and 16 kg/m2.
Between 5 and 10 trays are positioned in the path of the spreading machine and after the machine has passed over, each tray is lifted, together with the retained chippings, by means of four chains. The chains are hooked to the spring balance and the rate of spread is read directly from the balance scale.
|47-0011||Calibrated Spring Balance||info »|
|47-0012||Tray and Chains||info »|