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Publication Number: FHWA-HRT-06-132
Date: December 2006
The FWD tow vehicle should be warmed to achieve an interior temperature of at least 5 °C (40 °F) before turning on the signal processor or data collection computer.
For testing in ambient temperatures at or below -10 °C (15 °F), the standard hydraulic fluid should be replaced with a lighter-weight synthetic fluid or other oils as recommended by the manufacturer. Some oils may not be appropriate for warm-weather operations.
Topics: research, infrastructure, pavements and materials
Keywords: research, infrastructure, pavements and materials, Deflection measurement, falling weight deflectometer, LTPP
TRT Terms: research, facilities, transportation, highway facilities, roads, parts of roads, pavements