This approach closely simulates actual field conditions. The use of loaded wheel type testing can provide a fast and accurate means of predicting rutting at both the design and production stages of the mix. In order to perform loaded wheel tester research, there was a need to develop an apparatus that could accomplish the testing. In 1985, when the GDOT began considering this approach, Georgia Tech was contacted to assist in the development of a machine that would meet GDOT's needs. During the preparation for this development work, it was decided that the Benedict Slurry Seal Tester, already in use by GDOT, could be modified for this purpose.
Asphalt mix design procedures are concerned only with the volumetric properties of the mix.
These mix design procedures do not make use of proof testers to predict the performance of the mix in the field. There was a need for a device to predict rutting which is a common type of asphalt pavement distress in Georgia. One of the primary aims of this research was to evaluate a modified LWT's capability in predicting rutting tendencies of asphalt mixes. Initial testing concentrated on the three variables thought to be significant in potential rut development, tire pressure, testing temperature, and load. Modifications were made to the Benedict Slurry Seal Tester converting it to a wheel-tracking device.