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GYROTRONIC WITH SHEAR STRESS – RESEARCH GYRATORY COMPACTOR

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This model is basically structured as mod. B041 and B041EN, but, in addition, it includes the shear stress measurement device and therefore
it is recommended for both design and research purposes.
The device provides the most important parameters required to determine the main properties of asphalt mixes, and to predict their suitability for
practical uses. This integrated measurement allows user to perform tests without any additional operation. The system comes already calibrated
from the factory.

MAIN FEATURES
Integrated shear stress measurement.
A dedicated group of load cells measures all the involved forces acting on the specimen and through our software the
effective shear stress value is calculated.
Real time display of the instant shear stress value along with the entire compaction process.
Calculation of the resultant load eccentricity and consequently the effective tilting moment.
Results exportable into an Excel data report, which can be easily edited by the user.

GYROTRONIC EXCEEDS THE STANDARDS
The R&D department is continuosly committed to improve the performance of SGC compactors. Matest aims to meet any type of need and
purpose, from academics to researchers and routine testing laboratories, through a constant attention to quality.
The annual revisions have led to the development of a high performance electro-compaction system that exceeds the standard indications.
Applies constant stress regardless the specimen response
No rigid reaction to specimen behaviour
Easy to control
Inherently good stress/load control
Cost competitive with low maintenance
Reliable and precise
The following table clearly shows the reasons why Gyrotronic goes beyond the acknowledge figures.

GYROTRONIC AND ACCURACY
Gyrotronic strictly mantains the compaction angle, exceeding the EN and ASTMs standards. In fact, the angle IEA240 is precisely defined
within an accuracy of ±0.003°.
Also, all specifications defined in the EN 12697-31 Annex C are complied and exceded. The maximum difference between the four individual
measurements, that gives an idea about the planarity of top and bottom faces, is completely under the standards limit.
Another aspect is the parallelism between top and bottom faces: the difference between the Internal Top Angle, ITA, and the Internal Bottom
Angle, IBA, also indicated as δTB meets and exceeds the standard.
The compacted specimens will be perfect for mechanical analysis: parallelism between top and bottom plane, associated with right planarity,
and perpendicularity between vertical walls and each plane are the fully guaranteed.

AVAILABLE MODELS
B041-01
RESEARCH GYRATORY COMPACTOR – ASTM
STANDARDS: ASTM D6925 | AASHTO T312 7 SHRP M-002
The machine is calibrated at Matest factory and supplied with
the internal angle set to 1.16° as requested by ASTM, AASHTO
Specifications.
B041-01 EN
RESEARCH GYRATORY COMPACTOR – EN
STANDARDS: EN 12697-10, EN 12697-31
The machine is calibrated at Matest factory and supplied with the
internal angle set to 0.82° as requested by EN Specifications.

 

ACCESSORIES to perform the test: (for all Gyrotronic models)
B041-05 HARDENED SPECIMEN CYLINDER Ø 100 mm complete
with bottom plate
B041-06 HARDENED SPECIMEN CYLINDER Ø 150 mm complete
with bottom plate
B041-08 HARDENED SPECIMEN CYLINDER Ø 100 mm with holes
for cold mix compaction, complete with bottom plate
B041-09 HARDENED SPECIMEN CYLINDER Ø 150 mm with holes
for cold mix compaction, complete with bottom plate
B041-11 TOP PENETRATION PISTON Ø 100 mm
B041-12 TOP PENETRATION PISTON Ø 150 mm
Metallic discs, to make easier the handling of specimens after the
test, strongly recommended accessory for low-cohesion mixtures,
such as draining asphalts:
B041-13 METALLIC DISC for Ø 100 mm moulds. Pack of 2
B041-14 METALLIC DISC for Ø 150 mm moulds. Pack of 2
Paper discs, to prevent asphalt from sticking to the piston and the
mould’s base plate, and to absorb bitumen in excess:
B041-15 FILTER PAPER for Ø 100 mm moulds. Pack of 100
B041-16 FILTER PAPER for Ø 150 mm moulds. Pack of 100

Hollow Punches for Gyratory Compactor:
Used to maintain the core in the right shape and store cohesive
asphalt samples after compaction.
Some asphalt mixes can be very unstable due to their high void
ratio and large particle size. Wrapping the sample around the hollow
punch will prevent it from crumbling down or receiving physical
deformations once it is ejected from the mould.
The material will then settle down and assume its stiff properties
once it cools down after compaction:
B041-17
HOLLOW PUNCH to stabilize and to mature the sample Ø 100 mm
B041-18
HOLLOW PUNCH to stabilize and to mature the sample Ø 150 mm

ACCESSORIES for the Gyratory Compactor:
B041-20 WORKTOP for B041 and B041EN, it can also accept
the pneumatic specimen extruder (B041-23) and the
integrated balance (B041-26)
or:
B041-19 WORKTOP for B041-01 and B041-01 EN, it can also
accept the pneumatic specimen extruder (B041-23) and
the integrated balance (B041-26)
B041-23 PNEUMATIC AUTOMATIC SPECIMEN EXTRUDER, it can
be fixed to the worktop B041-19, B041-20, or to any
bench.
V207 AIR COMPRESSOR, pressure 10 bar.
Technical details: see p. 598
B041-35 FILTER GROUP for condensed water removal from the
compressed air. (needed accessory).
B041-21 WHEELS (kit of 4) with brake, for an easy displacement
of the Compactor in the laboratory.
B041-30 VERTICAL FORCE TESTING DEVICE with load ring.
As alternative:
B041-31 VERTICAL FORCE TESTING DEVICE with digital dynamometer.
B041-33 KIT OF 2 DISTANCE PIECES of 105 and 115 mm high for
the control of the height values measured by the linear
transducer.
B041-34 ACCREDIA official vertical load calibration certificate.

WEIGHTING SOLUTIONS

B041-26
BALANCE, INTEGRATED into the worktop, to facilitate the
sample and the mould weightings, by avoiding the stress of lifting
them.
The weighting reading values are directly and automatically displayed
on the control panel of the Compactor.
Capacity: 30 kg
Accuracy: ± 6 g

or

B041-27
BENCH for lateral bearing of a weighting balance.
Suggested balance:
V075-13 Capacity 30 kg div. 0.5 g
or:
B041-24 Capacity 30 kg div. 0.1g as requested by EN
(or a balance of the customer)

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