 
GYRATORY COMPACTOR CRT-GC1
SHRP - CEN
CRT-GC1 (GYROCOMP2)
<title>CRT-GC1 (GYROCOMP2)
Gyratory compaction is considered to be the best method of making moulded specimens which are representative of the material laid and compacted in the road.
While a vertical compaction stress is applied, a gyratory action generates horizontal shear stresses in the material simulating the action of a road roller.
NEW FEATURES 
Highly accurate closed loop angle control
Shear measurement
Integral mould extractor
User friendly software
Software for compacting to target density, number of gyrations, height, or change in height
100mm and 150mm moulds
Moulds for the compaction of emulsion-aggregate mixes
High speed 16 bit data acquisition and control system
Gyratory compaction can be used to:
Manufacture test specimens
Determine target site density.
Assess compatibility
Test method number:
CEN PrEN 13108/12697-31
The standard CRT-GC1 is designed to compact bituminous materials under the conditions which have been adopted by SHRP in the USA and CEN in Europe.
The CRT-GC1 makes gyratory compaction simple and safe for the operator. The required quantity of mix is placed in the mould. The mould is then placed in the CRT-GC1 and the compaction process started.
The software, which runs under Windows, automatically applies the compaction stress, adjusts the angle, and starts the compactor gyrating. As the compaction process proceeds, the number of gyrations and vertical deformation and shear is recorded after the completion of each gyration. The relationship between number of gyrations and mix density (if the mass of material is known) is plotted on screen in real time.
The compaction stress is removed and the gyratory action stopped automatically when:
A selected number of gyrations has been completed or
A target density has been achieved or
The rate of density change has reached a selected level
Emulsion-aggregate mixtures can be compacted using slotted moulds. During compaction, water in the mix drains through slots in the walls of the mould and past the lower platen. The water is collected in the grooved base plate and surplus liquid can be drained through a tube to a suitable container. Moulds are available in both 100mm and 150mm diameter versions.
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