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Title:

Ascertaining Parametric Correlations between Locked-Wheel Friction Testing and Fixed-Slip Friction Testing Devices on Louisiana Highways

Accession Number:

01333087

Record Type:

Component

Abstract:

Pavement friction testing originated in the 1950’s and has been studied Internationally. There are four major types of friction testing methods: lock wheel (LWT), fixed slip (FXSL), variable slip, and side force. The Federal Highway Administrator solicited the Louisiana Transportation Research Center (LTRC) to participate in a National study to evaluate fixed slip testers which it had purchased from Dynatest International (FXSLD) and Findlay Irvine (FXSLG). LTRC developed a testing program where the fixed slip testers previously mentioned were correlated to its LWT. Eight roadways were assessed with each device at 50 mph within a 2 hour interval. Approximately 7500 ft. were assessed on each roadway. Testing with the LWT included both the smooth (LWTS) and ribbed tires (LWTR). The regression analysis between fixed slip testers and a lock wheel tester (ribbed and smooth tire) indicated that statistically viable correlations exist for the roadway surfaces and FN ranges assessed in this study. More comprehensive testing should be conducted to validate the trend found in this study prior to establishing equations to be utilized on a Statewide basis. The t-test results indicated that a statistical difference exists between the FXSLD and FXSLG and their variances were unequal. The authors feel that this is a significant issue that must be addressed by the friction testing community and regulation industry. Though both devices were calibrated in accordance with their manufacturer’s recommendations, different FN maximums (μmax) as well as precisions (variances) were discovered. Such a scenario would make it unfeasible to establish investigatory or intervention friction criteria for a roadway network using fixed slip testers.

Monograph Accession #:

01329018

Report/Paper Numbers:

11-2755

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Gaspard, Kevin
Zhang, Zhongjie

Pagination:

19p

Publication Date:

2011

Conference:

Transportation Research Board 90th Annual Meeting

Location: Washington DC, United States
Date: 2011-1-23 to 2011-1-27
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (3) ; References (34) ; Tables (2)

Uncontrolled Terms:

Flow number; Locked wheel testers

Geographic Terms:

Louisiana

Subject Areas:

Highways; Maintenance and Preservation; Pavements; I61: Equipment and Maintenance Methods

Source Data:

Transportation Research Board Annual Meeting 2011 Paper #11-2755

Files:

TRIS, TRB

Created Date:

Feb 17 2011 6:16PM