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Tests

Testing Bending test: specimen measuring 5 x 0.5 x 0.25 m loaded to fracture in three point bending (photo 6605: setup, photo form 6611 failure). Bearings  Length: 4.49 m Fracture Last: 456 kN. Fraction Shape: local Upsetting the top skin, outwardly directed (see photo). The sample shows a large post-failure load: there are hardly any fiber breakages. Repair of this damage is also possible. With the breaking load of 456 kN, the bending strength margin in surge direction  is  proven for the bridge Oosterwolde, almost with a factor of 10. The pressure test in the thickness direction provides spectacular results: the test failed at the equivalent of just over 20,000 kN / m ^ 2 (!!!; 971 kN on an area of 19.2 x 24.8 cm)). In comparison, bicycle-pedestrian bridge: 5 kN / m ^ 2 and with point load of 700 kN / m ^ 2, Class 600 bridge: max approximately 950 kN / m ^ 2. After the initial failure, the specimen remains absorbing energy at a stress level about 10,000 kN / m ^ 2. After removing the load, the consruction comes back in its originally designed form and skins appear undamaged, the damage is concentrated in the core.