Humboldt -Testing Equipment for Construction Materials

Portable Skid Resistance Tester— H-3204

Measures friction (skid resistance) on flat, cambered, or gradient road surfaces. Originally developed by the Transport and Road Research Laboratory of Great Britain.

• Compact, easily transported & used in the field
• Can be used in remote locations, independent of any vehicle
• Enclosed bearings & working parts for protection against wear and contamination
• Heavy-duty frame construction<
• Adjustable feet on base

A pendulum arm, having a spring-loaded rubber slider on the pendulum foot. Device is placed on the portion of the road surface to be tested. It is then leveled, and the height of the center of suspension of the pendulum is adjusted to a fixed value which is read on a special gauge.

The pendulum is then released from its horizontal position, to swing down freely until the rubber slider contacts the test surface. As the slider travels across the surface for a fixed distance, the pendulum is slowed and a frictionally-constrained pointer affixed to the pendulum arm measures the highest point in the pendulum arc. The position of the pointer is then read on a measuring arc graduated from 0 to 150. Pointer readings indicate the resistance to skidding of the test surface.
Dimensions (include carrying case): 31" x 25.5" x 9" (787 x 648 x 229mm).
Meets ASTM E303.
Shipping wt. 75 lbs. (34.0kg)

Portable Skid Resistance Tester— H-3204

$7848.00 Add to Order

Portable Skid Resistance, Rubber slider, 1-1/4"—H-3207

Rubber slider, 1-1/4", for lab use

Portable Skid Resistance, Rubber slider, 1-1/4"—H-3207

$43.00 Add to Order

Portable Skid Resistance, Rubber slider, 3"—H-3208

Rubber slider, 3", for field use

Portable Skid Resistance, Rubber slider, 3"—H-3208

$88.00 Add to Order

Portable Skid Resistance, Laboratory base plate—H-3206

Laboratory base plate

Portable Skid Resistance, Laboratory base plate—H-3206

$972.00 Add to Order

Accelerated Polishing Machine— H-3205

The Accelerated Polishing Machine polishes samples of aggregates, simulating actual road conditions, and is used in conjunction with the Portable Skid Resistance Tester to determine the Polished Stone Value for aggregates used in road surfaces, and gives a measure of the resistance to skidding. Fourteen specimens are clamped around the “road wheel” of the polishing machine, and subjected to two stages of polishing by a loaded rubber tire. First by corn emery, and secondly by emery flour. Use of the Accelerated Polishing Machine and the Skid Resistance Tester in road construction has had a major influence in reduction of accidents.


The H-3205 features:

• Heavy welded steel mainframe, standing in adjustable pads
• Digitial display preset timer and revolution counter.
• Specimens are easily affixed and removed from testing wheel
• Water gravity fed from high level tank through calibrated flowmeter.
• Used abrasive and water collected in removable tray.
• Loaded tire raised and lowered to the running surface by machanical lifting device.
• Easily removed covers and guards protect operator during testing and safety switch ensures removable saftey covers are in place.

Accelerated Polishing Machine— H-3205

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