Hollow punch, diameter 150 mm
Hollow Punch to stabilize and to mature the sample, 150 mm diameter.
Used to maintain the core in the right shape and store cohesive asphalt samples after compaction.
Some asphalt mixes can be very unstable due to their high void ratio and large particle size. Wrapping the sample around the hollow punch will prevent it from crumbling down or receiving physical deformations once it is ejected from the mould.
The material will then settle down and assume its stiff properties once it cools down after compaction.