The Automatic Drying Unit (ADU) provides a rapid drying method for compacted asphalt road cores that come from the jobsite wet and must be quickly analyzed for density. This equipment is ideal for same-day analysis of road cores to acquire data for correlation purposes, or to know if the asphalt placed that day meets specifications.
The ADU takes the place of drying the core samples in front of a fan or in a low temperature drying oven for several hours. The typical drying time is between 10 and 20 minutes, saving you hours of waiting. The core density can easily be determined within 30 minutes of arriving in the laboratory. The ADU can also dry loose aggregate or asphalt by using the bag provided with the unit.
Pushing the start button activates the vacuum pump, which draws the air out of the sample chamber. After the air is evacuated, the water is then drawn out of the sample. The attached heating mechanism keeps the sample close to room temperature.
User Friendly Interface and Simple One-Button Operation
The ADU is user friendly with a large, easy-to-read display and an audible alert that indicates when sample drying is finished. The menu driven operation provides clear, concise instructions from device setup to sample drying. To operate the ADU, just place the sample into the chamber, press the button, and wait for the beep.
The ADU Model 5151 complies with ASTM standard D7227 and AASHTO R79.