• High precision, robust load mechanism combined with an extremely rigid frame assures high accuracy and repeatability
• Load cell fitted directly on the vertical actuator for accurate load measurement and feedback control
• Quick and easy manual/mechanical adjustment of the gyratory angle shown on the display
• User defined axial stress and speed of rotation
• Sliding transparent door with safety interlock
• Catch tray to collect expelled liquids using perforated moulds
• Fresh concrete configuration available
• Easy control using the integrated 7″ colour touchscreen panel or connected PC
• User friendly PC software for data analysis and tests set up. Remote communication is available to receive immediate diagnostics
• Automatic data saving on USB or on Windows PC
• Lightweight yet robust moulds strictly comply with international Standards
• Safe and easy mould insertion and extraction with automatic lifting ensures low effort for the operator and higher productivity
• Simultaneous extraction of last specimen for higher productivity
• Easy specimen extraction with the integrated extruder
• Mounted on swivel caster wheels for easy moving and positioning
• Real-time direct shear and torque resistance measurement. Automatic calculation of the compaction energy (optional)

Operating principle

Standard specify the method for compaction of cylindrical specimens of bituminous mixtures using a gyratory compactor. Such compaction is achieved by combining a rotary shearing action with a vertical static force applied by a mechanical head.

The method can be used for:

• Preparation of specimens of a given height at a predetermined density, for subsequent testing of their mechanical properties;
• Derivation of a curve of density versus number of gyrations;
• Void content for a given number of gyrations.

Standards apply to bituminous mixtures (made either in laboratory or from on-site sampling), with aggregates not larger than 37.5 mm. During operation the bituminous mixture is contained in a cylindrical mould (100 or 150 mm diameter). Compaction is achieved by the simultaneous application of a low-static compression and a shearing action, which results in the motion of the centre-line of the test piece, which generates a conical surface of revolution while the ends of the test piece remain approximately perpendicular to the axis of the conical surface.

Technical Specifications