Viscosity Grading A classification system of asphalt cements based on viscosity ranges at 60°C (140°F). A minimum viscosity at 135°C (275°F) is also usually specified. The purpose is to prescribe limiting values of consistency at these two temperatures. 60°C (140°F) approximates the maximum temperature of an asphalt pavement surface in service in the U.S. 135°C (275°F) approximates the mixing and laydown temperatures for hot mix asphalt pavements.
Viscosity A measure of a liquid's resistance to flow with respect to time.
Well-Graded Aggregate Aggregate graded with relatively uniform proportions, from the maximum size down to filler.
Wet Mixing Period The interval of time between the beginning of application of asphalt material into a pugmill and the opening of the discharge gate.
Whirl Spreaders Spreaders that are attached to or are built onto dump trucks. Aggregate is fed onto the spreader disc through an adjustable opening. The speed of the disc controls the width of spread.
Workability The ease with which paving mixtures may be placed and compacted.
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