Schwarzachtobler sandstone
The Schwarzachtobler sandstone is mined in a quarry in Bildstein in the Austrian state of Vorarlberg . The sedimentary rock was formed around 30 million years ago in the Tertiary ( Upper Oligocene ). It is part of the sequence of layers of the Lower Sea Molasse .
The quarry is located at Tobelstraße 419 in the municipality of Bildstein. The access goes via the L7 towards Bregenzerwald .
Technical specifications
- Quartz content 57%
- Gross density: 2.65 tons per m³
- True density: 2.77 tons per m³
- Compressive strength: 244.8 N / mm²
- Flexural tension: 15.6N / mm²
- Wear value: 5.89 cm³ / 50 cm²
- Porosity: 4.38%
- Water absorption: 4.26 grams / 0.37%
- Frost resistance: yes
- Resistance to road salt: Yes
Products made from Schwarzachtobler sandstone
- Armourstones
- Slope construction stones
- Facing brick
- Scraping
- Bricks
- Floor and terrace coverings
- Facades
Dismantling in the 21st century
The Schwarzachtobel quarry has 2 storage layers. The first bearing is 2 meters thick and the second bearing is 4 meters thick. The raw blocks are dimensioned in formats of 10 to 25 tons using pneumatic drilling rigs . But larger formats can also be produced. After drilling, the holes are filled with separating cement and the desired breaking point is created. The detached raw block is removed from the rock with a 52-ton excavator and loaded onto a low-loader for further processing.
Schwarzacher whetstones
The Schwarzach whetstone production , the oldest and once flourishing branch of industry, goes back to the 17th century.
Web links
Coordinates: 47 ° 26 '35.3 " N , 9 ° 47' 13.8" E