The jobsite was located 1600 m above sea level and all of the rock excavation material was recovered from greywacke shale, crushed with the R900 and reused for different areas on the site. For crushing the virgin stone, the company Hinteregger hired a Rockster impact crusher R900 from Rockster’s Austrian distributor Haberl Construction Ltd in Seekirchen. The R900 crushed material from 0-700 mm in diameter and produced gravel 0/32 and 32/70 (Fig. 2). 0/8-material was separated by another screen and used for rock slopes below the drainage mats, the grain size 8/32 was used for drainage and the grain size 32/70 was required to overfill the lining foil. In total, about 8000 m³ of rock material was crushed at this alpine site (Fig. 3).
Georg Fuchsberger of Haberl Construction reports: “In particular, the continuous control of the crusher speed and the two independently adjustable swing beams are great advantages of Rockster crushers and guarantee our customers an easy and high quality final grain production.“