Description

Short technical description: Freezing tests The equipment was designed to allow a minimum distance of 50 cm between the frost front and the ground water. The equipment consists of two Perspex tubes, the suction tube, and the cap. Water can be taken up freely by the sample trough the suction tube. Undisturbed soil sample is pressed into the suction tube so it reaches 11 cm above the top of the tube. The cap is places on the sample and the lid rests on the top of the sample. This design is intended to allow the sample to freeze within the cap, which will be lifted without any resistance from adfreezing. The frost front always remains within the cap. The freezing test itself is performed in a cooled room with a temperature of 46C. Before starting the test, a cooling element is placed on the lid of the cap, the cap is insulated and the freezing tube is placed in a bowl of water. Weights are placed on top of the cooling element to simulate a certain ground pressure and a position transmitter is placed on the weights to record frost heave. The bowl of water is provided with a device to ensure the water level is kept constant during testing and water uptake is recorded. Thermometers are placed along th cap. A very thin layer of the wall of the cap separates the thermometers from the sample. Immediately after completing the freezing test, the unfrozen portion of the sample is pressed out of the suction tube and sliced in 50 mm slices. The water content in each slice is measured. In the frozen portion of the samples the water content is also determined. Construction date: 1998 Last upgrade: 0

Keywords

Freeze-thaw

Comment

Transfered by script test/facilities at 2010-07-29 08:30:49 / other info: >> name_last_updator: Sigvard Tim | validator_name: Alain Maldonado <<