C-Tech EDC-3A, Product Manual, Page: 3 / 7

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I. Description
The Marshall compactor EDC-3A is used to make asphalt mixture specimens by standard compaction
method for testing the physical and mechanical properties of asphalt mixture in the laboratory. It is
suitable for the forming of Φ152.4mm (±0.2mm) × 115mm / Φ101.6mm (±0.2mm) × 63.5mm
cylindrical specimens used in Marshall test and indirect tensile test. EDC-3A has a manual lever
hammer lifting device.
II. Technical specifications
Power supply Three-phase three-wire 380V, 0.3KW
Drop height 457mm±1.5mm
Hammer weight 10210g±10g/4536g±9g
Compaction speed 55±5 times/min
Preset compaction times Maximum 9999 times
Controller form
Digital display
Phase sequence protection: not available
Hammer lifting device: manual lever convenient hammer lifting device,
electric hammer lifting device and die ring automatic pressing device
Specimen size
Φ 152.4mm （ ±0.2mm ） ×115mm/ Φ101.6mm （ ±0.2mm ） ×63.5mm
The Marshall compactor EDC-3A supports both
φ
152.4 mm(±0.2mm) ×115mm and
φ
101.6 mm
(±0.2mm) ×63.5mm cylindrical specimens used in Marshall test and indirect tensile test. EDC-3A
has two size s of hammer weight.
III. Preparation
① . Weigh asphalt mixture prepared evenly for the amount required of a specimen (about
1200g/4050g). When the density of the asphalt mixture is known , it can be calculated according
to the standard size of the specimen and multiplied by 1.03 to obtain the required amount of
the mixture.
② . During the specimen preparing, in order to avoid the mixture temperature drop, should put the