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From page 8...
... 5 2. INTRODUCTION AND RESEARCH APPROACH This report presents the results of NCHRP Project 20-07/Task 361, Hamburg WheelTrack Test Equipment Requirements and Improvements to AASHTO T324.
From page 9...
... 6 the non-uniform wheel speed across the specimen, geometry of the specimen, and air void profile.
From page 10...
... 7 needs to be measured, and the needed accuracy and resolution of the measurements. As these critical points are identified, the work progressed to evaluate the capability of the existing equipment to accurately measure, control, and maintain the desired test conditions.

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