Darmstadt Abrasion Resistance Test Mean?
The Darmstadt Abrasion Resistance Test is a test procedure developed by the Darmstadt Institute of Hydraulic Engineering and Hydrology that is used to evaluate the abrasion resistance of a liner or pipe section. The test consists of repeatedly and alternately tilting a semi-circular pipe section containing a sand/gravel/water mixture in a test jig for a specific number of cycles. The resulting wear is then measured and recorded at regular intervals at the middle section of the test specimen.
The Darmstadt Abrasion Resistance Test is also known as the Darmstadt Method.
Trenchlesspedia Explains Darmstadt Abrasion Resistance Test
Abrasion, primarily in sewer pipes, can be a major cause for concern in urban sanitation systems in long-term operation. This abrasion is caused by the transport of water and solids in the pipe system over time and eventually results in wear of the inner walls of the pipe. The rate and severity of the wear depends on the properties of the abrasive material such as the granulometry, chemical composition, the speed at which the abrasive material passes through the pipe, among others.
The Darmstadt Abrasion Resistance Test attempts to simulate the abrasion and resulting wear of liners and pipes that would occur in actual operating conditions. A specified in the DIN EN 295 (Vitrified clay pipes, fittings and pipe joints for drains and sewers; part 3: test methods), the pipe section being tested should be 1m in length and filled with a mixture of sand, gravel, and water. The specimen is then placed in a testing rig that tilts the subject in alternating axial directions at an angle of 22.5o. This process is carried out for a minimum of 100,000 cycles before readings are taken and recorded.