Frost heave rate test tester

TT-DZL1Frost heave rate test tester

　　Frost heave rate test tester

By studying the soil freezing process, parameters such as frost heave rate and frost heave force can be obtained. Freeze thaw cycle tests under certain stress states (one-dimensional state) can also be studied, and the deformation characteristics of frozen soil during melting can be studied. The thaw settlement coefficient of frozen soil and the compression coefficient of soil can be obtained.

Main parameters:

★ 1. One dimensional soil column structure: using transparent acrylic structure, the sample size is soil sample diameter 100mm, height 100mm, temperature sensors are set at intervals of 10mm, and temperature sensors are installed;

★ 2. Vertical loading system: resolution not less than 240 * 128 LCD display, maximum speed not less than 9.99999mm/min, minimum speed not less than 0.00001mm/min, stepless speed regulation, maximum stroke not less than 100mm, resolution 0.001mm, embedded in the front panel of the host no more than 16 thin film buttons for control (non external connection button controller), maximum axial force not less than 10kN, accuracy not greater than+/-0.1% F.S, built-in no less than 4-channel acquisition instrument (non external acquisition instrument), capable of collecting hole pressure, load LVDT、 Various sensors such as temperature are used to display the working status of the instrument;

3. Axial displacement measurement range: 0-100mm, accuracy+/-0 1%F.S， Resolution 0.001mm;

4. Control method: It can be strain controlled or stress controlled;

5. Strain gauge control: maximum axial displacement not less than 100mm, minimum shear speed not greater than 0.00001mm/min, stepless speed regulation;

6. Stress control: Axial stress 0-1.2MPa, arbitrary and controllable.

★ 7. Head replenishment pressure volume controller: not less than 1MPa, resolution not greater than 1kPa, absolute accuracy not greater than+/-1kPa, maximum volume not less than 265ml, resolution 0.001ml, accuracy+/-0.01ml, equipped with USB interface, embedded with no more than 16 thin film buttons on the front panel of the controller (non external connection button controller), matched with non touch LCD (resolution not greater than 128 * 64); Automatic protection device to prevent exceeding pressure and volume, pressure regulation and display up to 1kPa, volume control and collection up to 0.001ml;

8. Upper temperature control system: Equipped with 2 sets of temperature sensors, one set is used for temperature control of low-temperature water tanks. The temperature control range is adjustable from -5 to 100 ℃, with an accuracy of no more than+/-0.1 ℃. It can control temperature gradients and can perform sine, rectangular, triangular, and linear mixed programming. It is also equipped with a touch screen, which can be controlled by computer software or programmed through the touch screen,

Another set of temperature sensors is used to control the temperature at the upper end of the soil column. The temperature sensor directly contacts the sample to ensure temperature control at the upper end of the sample. The upper end of the instrument must consider temperature uniformity control and sealing. It is equipped with a water replenishment joint, which can be directly connected to the head replenishment pressure volume controller to control and collect the migration of moisture during the freezing process;

★ 9. Lower end temperature control system: Equipped with 2 sets of temperature sensors, one set is used for low-temperature water tank temperature control, with a temperature control range of -40~100 ℃ that can be adjusted arbitrarily and an accuracy of no more than+/-0.1 ℃. It can control the temperature gradient and can be programmed with sine, rectangle, triangle wave, or linear mixed programming. It is also equipped with a touch screen, which can be controlled by computer software or programmed through the touch screen. Another set of temperature sensors is used to control the lower end temperature of the soil column (upper and lower ends, set by the user). The temperature sensor directly contacts the sample to ensure the control of the lower end temperature of the sample. The lower end of the instrument must consider temperature uniform control and sealing. It is equipped with a water replenishment joint, which can be directly connected to the head replenishment pressure volume controller for controlling and collecting water content during the freezing process. Migration;

10. Supporting frost heave test software: It can collect changes in the temperature field of the soil column, and the temperature sensor on the side wall is used to measure the temperature state. According to the test plan, different test stages and end conditions can be set to conduct frost heave amount, frost heave force test, cyclic freeze-thaw test, and melting consolidation test under different temperature differences. It can also measure the changes in the soil temperature field and the water migration during frost heave under different water heads. Each test module can be set with temperature loading gradients (sine, rectangle, triangular wave, linear, etc.).

★ 11. Aluminum alloy shell insulation device: used for sample insulation, with insulation material thickness not less than 50mm, and the shell made of aluminum alloy;

12. Temperature sensor acquisition system: 16 acquisition channels, 16 bit high-precision AD chip.