A procedure that involves the determination of one-dimensional consolidation and swelling properties of soils is presented by Wykeham Farrance/ CONTROLS Group. The Automatic Computerized Oedometer (ACE EmS) that comes loaded with the new environmentally friendly Electromechanical Servoactuation (EmS) technology is used.
During the consolidation test, the specimen is restrained laterally and drained axially (from the top and the bottom) while subjected to incrementally applied controlled-stress loading. The vertical deformation is measured for each step. To perform the consolidation test with the ACE EmS the cables of the main power, the LAN to PC, the Load cell and the displacement transducer, and the compressed air have to be connected properly to the rare panel.
According to the test standards (ASTM D 2435/D3877/D4546, BS 1377:5), the inside diameter of the specimen ring shall be at least 5 mm (0.25 in.) and the minimum specimen diameter-to-height ratio shall be 2.5. Use the cylindrical cutting ring to cut the soil to the proper diameter. After the specimen is inserted into the consolidation ring, place it in the cell that consists of the base, the lower porous disc, and the wall. Put a wet filter paper and a porous disk on top of the prepared sample. Insert the clamping ring and put the cell on the machine. Place the load pad and then adjust the beam height.
Automatic Consolidation Test
After the unit is turned on, open the Wykeham Farrance software and connect to your device. Use the software to enter the test settings and to zero the load reading. Start the test by applying the pre-load. Adjust the displacement transducer reference and zero the displacement value. Deformation readings are recorded at constant time intervals (pre-set by the user). The system compares the actual deformation reading with the zero reading. If the difference is negative (i.e. swelling occurs) and is higher than the limit value pre-set by the user, the system automatically applies the next step of pressure. By pressing the next button the 1st step begins: the load increases while the displacement is being measured. The load will increase automatically at pre-set by user time.
The ability to preset all test conditions and let each oedometer unit perform the entire test independently and automatically gives you consistency across testing procedures and the flexibility to perform other tasks while the test is still running. Numerical and graphical display of the readings are presented clearly in real-time and data is recorded during the consolidation test. Results are then processed using Wykeham Farrance (WF)’s easy-to-use Geo-Analysis templates, written by experts around international standards. Consolidation curves are automatically plotted and common consolidations parameters such as t50, t90 and Csec can be also calculated using the template tools.
Watch the video below that demonstrates the automatic consolidation test.
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