Advanced asphalt slab roller compactor, MASTERCOMP

The advanced slab roller compactor MASTERCOMP can compact asphalt slabs to a target density applying specific loads corresponding to those of pavements rollers used in the highway construction. The produced slabs can be used for: Wheel tracking tests, down to 38 mm thickness Cored to provide specimens for indirect tensile, static and dynamic creep tests. Cut into beams for bending fatigue tests. The machine can be used with moulds 500 x 400 mm, 500 x 300 mm, 400 x 300 mm, 300 x 300 mm and 320 x 260 mm, 195 mm high (to be filled at 155 mm max) by completing it with the suitable accessories. Maximum compacted slab thickness varies with bitumen mixes composition. The horizontal movement of the mould is applied by a brushless motor with user-defined controlled linear speed and adjustable pause at the mould inversion point. The longitudinal (major) mould dimension correspond to the compaction direction so it is possible to obtain specimens of the proper length conforming to Standards. All versions feature a solid high stiffness steel frame, with ergonomic design and safety devices conforming to CE standards. Featuring a compacting system by roller segment head radius 535 mm, the roller segment freely moves by simple friction for better compaction uniformity. A stepper motor moves vertically the roller segment under displacement and load control. The vertical load is applied orthogonally to the axis of the travel motion. The lifting machine cover permits an easy access to the mould area. In the “rest” position, the mould is closed to the operator while the roller segment is lifted and positioned at the back of the machine. The machine features a customized electronic card control with 21'' touchscreen PC.

21'' Touchscreen integrated PC Fully programmable PC software operating in Windows® Set up of customized compaction sequence as free combination of load/displacement controlled cycles Selection, customization and storing of test parameters Customization of the compacting sequence to be saved and recalled from the database Graphic display of displacement / force vs. number of passes or load vs. displacement

As recommended by new EN 12697-33 chapter 7.3, the combined load/displacement compaction procedure provides at the beginning a controlled displacement compaction, which can grant a flat surface of the compacted slab, followed by a load compaction phase, which can replicate the real compaction on the road surface.

Vertical displacement of the roller segment by stepper motor, measured directly by linear transducer to verify in real time the specimen thickness to eliminate the errors due to the deformation of the machine structure Real time measurement and control with a closed loop logic of compaction load by two precision strain gauge load cells. The dual cell system permits to verify possible discrepancies of the compaction due to the wrong distribution of asphalt in the mould and any other unexpected malfunctions, with warning to the operator. The machine is fitted with sensors to confirm the mould in position and for the automatic setup of the horizontal travel. MOULD DIMENSIONS: 500 x 400 mm, 500 x 300 mm, 400 x 300 mm, 300 x 300 mm and 320 x 260 mm, 185 mm high. The longitudinal (major) mould dimensions correspond to the compaction direction, to obtain specimens of the proper length conforming to standards.

Heating system control for sector heads fitted with heating system Base heating system, to maintain the mould and sample temperature Roller segment vibrator, to simulate the on-site vibratory rollers. Adjustable frequency from 10 to 50 Hz An alternative model is available, suitable for low-thickness slab, featuring molds height 155 mm, to be filled at 120 mm max (see model 77-PV40C05 / 77-PV40C06)