2–10
PREPARING A SPECIMEN
Lay the mold on its side and slowly insert the lower puck, with the
small face down, into the mold. For the rest of this chapter, the
mold with the puck inserted will be referred to as the mold.
WARNING
Always wear heat-resistant gloves when handling
any hot substance. When moving the mold, firmly
grasp it on either side under the top flange.
Place the asphalt mixture into an oven. Also place the mold
(containing the lower puck) into the oven. Heat the asphalt mixture
and mold to the compaction temperature of the mixture.
CAUTION
Do not heat the mold above 175 C (350 F). Heating
above this temperature may warp the mold and create
errors in the angle of gyration.
NOTE
Do not place the asphalt mixture into the mold while
heating.
Remove the asphalt mixture from the oven, and place it on a work
surface. Remove the heated mold from the oven and place it next to
the hot-mix asphalt.
Place a specimen paper in the heated mold on top of the lower puck
(see Figure 2–3). Load the hot asphalt mixture into the mold.
NOTE
To maintain the specimen temperature and prevent
segregation of the specimen, the asphalt mixture must
be loaded into the mold in one continuous motion. The
paper thickness will affect compactor results; it is
recommended that you use Troxler specimen papers
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