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GAM – Gyratory Internal Angle Measurer

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Code: B041-28
EN 12697-31 ASTM D7115 AASHTO T344

The GAM by Matest is a precision device designed to validate and calibrate the internal angle of gyratory compactors. It simulates an HMA specimen, generating equivalent tilting moments and shear forces to reproduce real compaction conditions.

Suitable for angles required by EN 12697-31 and ASTM/AASHTO Standards, the GAM performs TOP and BOTTOM angle measurements, with the average considered as the “internal angle of the machine.” Data acquisition and processing are simplified through the included Excel spreadsheet, which calculates the internal angle, plots graphs, and provides indexes assessing measurement quality.

This device ensures accurate calibration for gyratory compactors used in asphalt mix research, quality control, and advanced laboratory testing.

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  • High accuracy of the measured data.
  • Connection to PC through RS232 cable.
  • Three modes of data acquisition: Single, Partial or Complete.
  • Accuracy: more than 0.01°, as requested by the Standards.
  • Data processing is carried out by a specific spreadsheet, which also allows to creation of the final calibration certificate.
  • No need for a power supply since the device is battery-operated. Also, it has an energy-saving feature which automatically switches off the device if it is not being used for a while.
  • Final calibration certificate.
  • Stand-alone device (battery operated).
  • Energy saving with integrated automatic switch-off function.

The device is supplied complete with:

  • Two different rings to perform tests either with M=240Nm or M=425Nm
  • Upper and lower base plate
  • RS232 cable
  • Strong practical suitcase
  • Calibration certificate

Data are read by GAM and then downloaded (via RS232 cable) all together at the end of the measurements, with no need to connect the device to the PC after each measurement.

Possibility to repeat even just one of the measurements, and lately include it in the calculation spreadsheet.

Power supply: n°2 batteries 1.5V type AA
Dimensions: Diameter 150 mm, Height 115 mm
Weight: 5.6 kg