ASTM E3304-22

5.1?Walking speed CFME is used to measure skid resistance on pavements/sidewalks, roads, repaired pavements, horizontal pavement markings, helidecks, and other trafficked surfaces.

5.2?Walking speed CFME is designed for low-speed surface friction surveys.

5.3?Walking speed CFME does not require acceleration or deceleration areas. Friction surveys begin from a standing or rolling start.

5.4?Walking speed CFME can work in very close proximity to people and obstacles.

5.5?The Specification E1844 measure tire is a smooth tire that is mounted on walking speed CFME. A new ASTM tire standard is required for alternate tires designed for use on walking speed CFME. ASTM tire standards shall be entered in the referenced documents section of this standard.

5.6?Walking speed CFME can be specialized to operate in specific areas, such as helidecks, with a specialized software application for a specific surface area. See Fig. 1.

5.7?The field calibration/field test equipment, if required, should be contained within a transport case, readily available for field use. See Fig. 2.

1.1?This test method is used to measure skid resistance on a wide range of trafficked surfaces and for a wide variety of circumstances using a walking speed continuous friction-measuring equipment (CFME) fixed-slip measuring equipment. The fixed-slip ratio is typically 12 to 20 % but may vary between CFME manufacturers.

1.2?Walking speed CFME enables surface friction surveys to be conducted where high-speed CFME is not able to measure because of safety reasons or due to limited operating space. Walking speed CFME is battery operated and pushed forward at a normal walking pace by the operator.

1.3?Walking speed CFME enables friction surveys to be undertaken over short lengths with precise survey lines such as friction (Mu) values for every 100 mm along a survey line.

1.4?Friction surveys can be conducted on dry surfaces, wet surfaces, contaminated surfaces, or with a self-wetting feature.

1.5?UnitsThe values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.

1.6?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.7?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.