Universal Multispeed Cbr, Marshall And Unconfined Test Machine

The Universal multispeed test machines are used to make CBR, Marshall and Uniaxial Unconfined Compressive Tests.

The Machine load frame provides compression/extension testing for a number of geotechnical tests that must have accurate control of the rate of displacement during loading.

The device is composed of a robust and compact two column frame with adjustable upper cross beam driven by an electromechanical ram. Two models are available as 50 kN and 100 kN capacity.

The testing speed can be set between 0,001 mm/min to 51mm/min. The speed setting of the loading plate is controlled from the digital readout unit. For safety, the up and down travel of the lower platen is limited the use of limit switches.

The measuring system consists of a 20 kN, 50 kN or 100 kN capacity load cell according to capacity of frame fitted to the upper cross beam to read stability values and the 25 x 0.01 mm Linear potentiometric displacement transducer fitted to the column.

Applicable Test Standards
• Unconfined Compression Testing of Soils
• Compressive Strength of Molded Soil-Cement Cylinders
• Standard Method for CBR
• Standard Method for Marshall Stability

S4630/50 Model is supplied complete with;
• 50 kN capacity Load Cell
• 25 x 0.01 mm Linear potentiometric displacement transducer
• Cbr Penetration Piston
• Compression Platens for with ball seating assembly
• Breaking Head Stability Mould for 4"(101.6) Marshall Samples
• Breaking Head Stability Mould for 6"(152.4) Marshall Samples
• TCM304 Touch Screen LCD Data Acquisition Control Unit
• CBR & Marshall & Uniaxial Software and USB Connection Cable.

S4630/100 Model is supplied complete with;
• 100 kN capacity Load Cell
• 25 x 0.01 mm Linear potentiometric displacement transducer
• Cbr Penetration Piston
• Compression Platens for with ball seating assembly
• Breaking Head Stability Mould for 4"(101.6) Marshall Samples
• Breaking Head Stability Mould for 6"(152.4) Marshall Samples
• TCM304 Touch Screen LCD Data Acquisition Control Unit
• CBR & Marshall & Uniaxial Software and USB Connection Cable.

TCM304 LCD Graphic Display Data Acquisition and Control Unit
The LCD Graphic Display is able to draw real-time "Load and Time", or "Flow and Time" graphics. Can save 500 test results in its internal memory. At the end of the test cycle, the results can be stored in the large memory or downloaded to a PC in TCM304 software xls format.

Main Features
• Calculates corrected CBR value at 2.5 and 5 mm in CBR Tests.
• The digital unit saves the load value at user defined displacement values such as 0.625, 1.25, 1.875, 2.5, 3.75, 5, 7.5,10, 13 mm in CBR Tests.
• The % CBR at 2.5 mm and % CBR at 5 mm is also automatically calculated and saved in CBR Tests.
• Flow and stability values are automatically calculated and saved in Marshall Tests,
• The unconfined compressive strength (qu) value and the undrained shear strength (cu) value of cohesive soils are obtained.
• Ability to perform displacement-controlled tests.

Hardware for Data acquisition and processing: by TCM304 readout unit
• 800x480 pixel and 65535 color resolution TFT-LCD touchscreen
• 3 pcs universal analog input sockets (ADC)
• Each analog input with 18 bit precision (1/256000)
• 1 replacement analog input
• Total of 4 analog high-precision measuring capacities
• 2 analog output sockets (DAC)
• PULSE / DIR outputs (PULSE / DIR / ENA) to control the servo and stepper motor drives.
• Digital outputs for general purpose (can pull relays and control different electrical units)
• Digital inputs for general purpose (receives and evaluates input signals like limit contacts from the environment)
• Potentiometer input (reference signal input for calibration and remote control)
• USB communication signal output (communicates with computers)
• Connects to local networks and the Internet with Ethernet 10/100 network connection output (optional)
• Connects to portable devices via Bluetooth wireless connection (optional)
• 500 test results can be stored in internal memory
• Due to the SD (memory) card connection, a large number of test results can be stored in the device memory (40,000 test results).
• In addition, the results can be taken from the device memory and transferred to the computer as an Excel table. (Optional)
• Resistive touch screen allows easy operation of device functions by touching the screen
• Sensor modules are compatible with loadcell (load cell), pressure sensor (4-20 / 0-20 mA), potentiometric distance sensors, strain washers, thermocouples and all kinds of mV output sensors.
• Provides precise calibration with multi-point calibration (up to 10 points)
• Setting and calibration menus are password protected and prevent unauthorized use
• Allows testing with a computer, tablet, smartphone or on the touch screen panel.
• There are many test sample information screens and test methods in the device memory and tests can be performed easily
• Different menu languages can be selected via the device via language support (Turkish, English, French, Spanish and Russian)
• Speed control algorithm is closed loop PID control and all parameters can be adjusted on user side.
• The device can switch between one-touch load and deformation control modes.
• The graphical field that visualizes the test results on the screen has the ability to change the scale automatically and automatically adjusts the optimal scale as the values change
• Firmware updates can be made via USB input. In addition, via the computer allows remote or internet update.
Optional software running in Windows® completely automates the test, reducing the data and preparing test results.

Data Acquisition & PC Software

The Software includes control of machine, acquisition of load and displacement data, saving them and reports. The Software accepts specimen diameter and height as an input parameter. It automatically calculates correction factor coming from the standarts respect to specimen size. The stability value is calculated regarding to this factor. The software continously updates load and displacement until the end of test.



When the test is completed, the sharpest slope of the graph is calculated. The point that this line crosses displacement axis is commented as an offset. This offset is subtracted from the displacement value at peak point and called as flow. Graphical outputs and reports can be saved as a MS Excel worksheet.