Cbr & Marshall & Unaxial Testing Machine (Touch Screen)

CBR & Marshall & Uniaxial Testing Machine is used to make CBR, Marshall and Uniaxial Unconfined Compressive Tests.
The device is composed of a robust and compact two column frame with adjustable upper cross beam driven by an electromechanical ram.

Models

Two models are available as 50 kN and 100 kN capacity.

CBR & Marshall & Uniaxial Control Unit

CBR & Marshall & Uniaxial Control Unit is designed to control of data from displacement transducers which are fitted to the machine.
All the operations of CBR & Marshall & Uniaxial Control Unit are controlled from the front panel color resistive of TFT-LCD touchscreen display and function keys.
The unit can perform CBR & Marshall & Uniaxial tests as a stand-alone without the use of a PC or with the H-GUI CBR & Marshall & Uniaxial Software and a PC. Control of machine, acquisition of load and displacement data in real time are provided by the unit.
The unit has easy to use menu options.
It displays all menu option listings simultaneously, allowing the operator to access the required option in a seamless manner to activate the option or enter a numeric value to set the test parameters and see all the data while the test running.

Main Features of CBR & Marshall & Uniaxial Control Unit

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 value at 2.5 mm and 5.0 mm are 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.
• Real time display of test graph
• 2 analog channels for load cell and displacement sensors
• Multi-language support (English, French, Spanish, Turkish)
• Real-time data display
• Test results display and memory management interface
• Calibration function for channels
• Programmable digital gain adjustment for load-cell and potentiometric sensors
• Closed loop PID for steady pace rate
• Connection and control feature via Ethernet
• Free computer software for test control and enhanced report output

Hardware Features

• Permanent storage capacity up to 10 000 test results
• 1/256000 dot resolution for each channel
• 10 data acquisition per second (at sample rate) on each channel
• 2 fully customizable analog channels with 24-bit ADC and PGA-FPGA circuit
• Ethernet port for computer connection
• 800x480 pixel and 65535 color resolution TFT-LCD touchscreen
• 32 Bit, 120 MHz ARM CORTEX M3 micro-Processor (CPU) for data acquisition
• 32 Bit, 400 MHz ARM CORTEX M3 micro-Processor (CPU) for data display
• Choice of the unit systems: kN, ton or lb
• Additional memory support up to 32 GB via external USB flash drive
• Support for optionally supplied integrated thermal printer
• LAN connection for instantaneous transfer of test data to PC
• USB port support for transfer of test data to a flash drive

Software

CBR & Marshall & Uniaxial Software has been designed for CBR & Marshall & Uniaxial Tests.
The software includes control of machine, acquisition of load and displacement data, generating and saving reports.

For CBR Tests

The software prepares a summary result for the user that will only need some specific loads such as at 0.625, 1.25, 1.875, 2.5, 3.125, 3.75, 4.375, 5, 7.5, 10 and 13 mm.
The software continuously updates load, stress and displacement till the end of test. Software can automatically draw the best tangent line and perform the upward concave correction as suggested by ASTM D1883. The corrected stresses values are then calculated with respect to this offset.
The CBR value at 2.5 mm and 5.0 mm are calculated by using the standard load values at those penetrations.

For Marshall Tests

Test type is selected in the software and then the sample height is entered as the test parameter. It automatically calculates correction factor coming from the standards with respect to specimen thickness. The stability value is calculated regarding this factor.
The software continuously updates load and displacement until the end of test. When the test is completed, the sharpest slope of the graph is calculated. The sharpest slope is shifted 1.5 mm to the right side of the graph and the intersection between 2nd slope and original test data is recorded as the stability value for the test. The horizontal distance between the intersection of first slope and X axis and intersection of test data with 2nd slope is recorded as flow value.
The report includes all results for 4 samples. The user can see 4 of the results on the same screen for easy comparison.

Test Speed :

• CBR & Marshall & Uniaxial Testing Machine 50kn - 0.001 - 51 mm/min
• CBR & Marshall & Uniaxial Testing Machine 100 kn - 0.001 - 51 mm/min

Dimensions (cm) :

• CBR & Marshall & Uniaxial Testing Machine 50kn - 47x70x110
• CBR & Marshall & Uniaxial Testing Machine 100 kn - 52x72x110

Weight (kg) :

• CBR & Marshall & Uniaxial Testing Machine 50kn - 100
• CBR & Marshall & Uniaxial Testing Machine 100 kn - 110

Power Supply :

• CBR & Marshall & Uniaxial Testing Machine 50kn - 220 V, 50-60 Hz, 1 ph
• CBR & Marshall & Uniaxial Testing Machine 100 kn - 220 V, 50-60 Hz, 1 ph

Spare Parts & Accessories :

• CBR & Marshall & Uniaxial Frame, 50 kN
• CBR & Marshall & Uniaxial Frame, 100 kN
• Load Cell, 50 kN capacity
• Load Cell, 100 kN capacity
• Displacement Sensor, 25 x 0.01 mm
• CBR & Marshall & Uniaxial Control Unit
• CBR & Marshall & Uniaxial Software

• The testing speed can be set between 0,001 mm/min to 51 mm/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 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 mm Displacement Sensor fitted to the column.