In many ways, triaxial equipment suitable for cyclic triaxial modulus and damping test is similar to equipment used for the consolidated - undrained triaxial compression test.
However, there are special features that are required to perform acceptable cyclic triaxial test.
Cyclic loading equipment used for load controlled cyclic triaxial test is capable of applying a uniform sine, square, triangle load at a frequency within the range of : 0,001 Hz to 100 Hz.

Special fully electronic pneumatic valves equipped with a separate digital display are provided for this purpose; these valves also exercise a safety function independent of the process computer.

A fully electronic burette is used to measure the water volume during a triaxial test. The water level in the burette can be read optically at any time.

The built in micro-vacuum pump with its digital display shows the existing underpressure when the entire system is deaederater.

A special Pw. transducer is used to measure pore-water tension. This transducer is connected directly to the soil sample by a drainage line.

Special stainless steel fast release couplings are provided for the connection between triaxial cell water container, pneumatic valves and vacuum.