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Abstract
There are many devices used around the world to measure friction. The majority of Departments of Transportation in the USA currently use locked-wheel trailers for friction measurements. The use of the fixed slip devices has gained popularity in other countries, especially in Europe, and they are starting to be used in the USA. These systems measure the friction under the condition similar to those produced by anti-lock braking system. This paper evaluates the effect of grade, water film thickness and speed on friction measurements of the continuous friction measuring equipment. The data used in this study were collected at the Virginia Smart Road using the GripTester. The experiment showed that grade affects the GripTester measurements suggesting that measuring with GripTester would be more accurate on flat surfaces. It also confirmed previous results that measurements were shown to be sensitive to water film thickness and testing speed.
Acknowledgements
The data used for this paper were collected during the annual rodeo as part of the Pavement Surfaces Properties Consortium. This experiment has been made possible, thanks to the contributions of the Virginia Transportation Research Council (VTRC); the FHWA; the Connecticut, Georgia, Mississippi, Pennsylvania, South Carolina and Virginia DOTs and the Virginia Tech Transportation Institute (VTTI). The authors would like to thank William Hobbs, Kenny Smith, Travis Graham and Stephen Valeri for their contribution in data collection.
Notes
1. Email: [email protected]
2. Email: [email protected]