Locked-Wheel and Sideway-Force CFME Friction Testing Equipment Comparison and Evaluation Report
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2019-05-01
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Abstract:This report compares network-level friction measurements obtained with a Sideway-force Coefficient Routine Investigation Machine (SCRIM) and traditional locked-wheel skid trailer (LWST). The report also describes the results of two “harmonization” experiments at the two national LWST testing calibration facilities and recommends equations for converting the SCRIM friction measurements to traditional friction measurements. A strong correlation was found between LWST measurements using a ribbed tire and the SCRIM measurements, as both measurements are more sensitive to microtexture than macrotexture. The results show that harmonization is possible with reasonable confidence, as long as it is conducted with significant controls. Field or network-level harmonization resulted in higher variability since the SCRIM and LWST did not test exactly the same surfaces. Since no high-speed friction measurement test can obtain both microand macrotexture, it is important to gather mean profile depth (MPD) data at the same time as the friction measurements. Incorporating equipment to obtain other geometric parameters normally used in safety/friction demand assessments, such as grade, cross-slope, and curvature, is also highly recommended.
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