Marshall Apparatus

The Marshall Apparatus is used to determine the Marshall Stability and Flow value of compacted bituminous mix specimens — key parameters in Marshall Mix Design for asphalt/bituminous pavement layers. The test is intended for the measurement of the resistance to plastic flow of cylindrical specimens of bituminous paving mixture loaded on the lateral surface. For use with hot mixture containing asphalt or tar and aggregate up to 25.4 mm maximum size. A cylindrical bituminous mix specimen (compacted using a Marshall compaction hammer) is placed in a curved breaking head and loaded at a controlled rate until failure; the maximum load resisted (stability) and the corresponding deformation (flow) are recorded. The 4-inch version tests standard-sized specimens as per conventional mix design. Suitable for operation on 220V, 50 Hz, single phase, AC supply.

It consists of:

Marshall Load Frame Cap 50kN speed-50.8mm/min- 1 No.

Breaking Head Stability Mould- 1 No.

Marshall Mould Steel 101.6mmx76mm, cylindrical-3 Nos.

Base Plate -3 Nos.

Extension Collar-3 Nos.

Compaction Pedestal, Manual Operation, comprising a Steel Plate capped on a wooden post. A Mould Clamp is fitted to the top of the plate-1 No.

Compaction Hammer for use with Compaction Pedestal and Mould, weight 4.5 kg with a free fall

of 457 mm-2 Nos.

Load Transfer Bar-1 No.

Sample Eject for 4" dia Sample-1 No.

Dial Gauge 25mm travel, 0.01mm least count 1 No.

Proving Ring capacity 25 kN.-1 No.