Digital and Analog Marshall Stability Test Machines

The Marshall Stability Test Equipment is used by contractors, testing laboratories engineers, highway departments, and other government agencies to test the stability of bituminous samples. It is designed for measuring resistance to plastic flow of cylindrical specimens of bituminous paving mixture loaded on the lateral surface.

The machine can deliver measurement data for use with hot mixture consisting of asphalt or tar and aggregate up to 25.4 mm maximum size. The equipment has a bench top loading frame with a screw-driven modifiable crosshead.

The Marshall Stability Test Machines from Tinius Olsen are available in two models: digital, using a loadcell to measure force and an LVDT to measure displacement; and a non-digital version that employs a proving ring to measure force and a micrometer to measure displacement.

Key Features

  • Precise speed
  • Maximum loading capacity of 50 kN
  • Single speed, bench top load frame
  • Geared screw jack and motor drive
  • Limit switch protection for both upward and downward movement

Model TO-550-1 Specifications

. .
Maximum vertical clearance 470 mm
Minimum vertical clearance 250 mm
Platen diameter 133 mm
Horizontal clearance 265 mm
Platen speed 50.8 mm/minute
Platen travel 25 mm
Rated power 375 W
Weight 60 kg
Dimension (LxWxH) 550 x 400 x 870 mm


Supplied as Standard

  • TO-55001 Breaking head assembly
  • TO-274 50 kN proving ring
  • TO-072 Dial gage

Optional Accessories

  • TO-55002 Compaction mold
  • TO-55003 Base plate
  • TO-55004 Extension collar
  • TO-55005 Compaction pedestal suitable for 4” dia specimen
  • TO-55006 Compaction rammer 10 lb
  • TO-55018-1 Sample ejector (hydraulic) for 4” dia specimen

Applicable Standards

  • ASTM D1559, BS 598-107, EN 12697-34, AASHTO T-245

Model TO-550-2 Marshall Stability Test Machine – Digital

Model TO-550-2 Marshall Stability Test Machine – Digital

Supplied as Standard

  • TO-55001 Breaking head assembly
  • TO-55020 Data acquisition system comprising:
    • Load cell 50 kN
    • Digital indicator
    • Displacement transducer 0-20 mm

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