Marshall Compactors

Marshall Compactors are used to mold hot mix asphalt test specimens for Marshall load testing. Under ASTM and AASHTO test methods, the compacted specimens are loaded to failure to determine their resistance to plastic flow. Gilson Marshall Compactors with options for manual or automatic and standard or indexing operation are available in a wide range of models.


Specimen diameter is determined by maximum aggregate size.  4in (102mm) diameter specimens are suitable for mixes containing aggregates up to 1in (25.4mm), and 6in (152mm) diameter specimens are used for aggregate sizes up to 1-1/2in (38.1mm).
  • Manual Marshall Compactor uses a manually operated drop hammer for compaction of a single 4in Marshall asphalt specimen in a stationary mold.
  • Automatic Standard-Duty 4in Compactor compacts Marshall specimens into a stationary 4in (102mm) mold. An automatic counter is set to control the number of blows.
  • Double or Triple Automatic Standard-Duty Compactors compact two or three Marshall asphalt specimens simultaneously into indexing 4in molds.
  • Automatic Heavy-Duty Indexing 4in Compactor compacts one 4in Marshall specimen in an indexing mold and has a heavy-duty frame to reduce mechanical wear during operation.
  • Automatic Heavy-Duty Indexing 6in Compactor compacts one 6in Marshall specimen in an indexing mold and features the same heavy-duty structure as the Indexing 4in Compactor.