NACC-4017

STANDARDS: EN 12390-3, 12390-4; BS 1881, ASTM C39

Automatic 600 kN Capacity Compression Testing Machine has been designed for reliable and consistent testing of core and rock samples. Machine confirms all EN, ASTM and BS standards written above. These also meet the requirements of CE norms for the safety and health of the operator.

A compression test determines behavior of materials under crushing loads. The specimen is compressed and deformation at various loads is recorded.

Testing machines are supplied with EN compression platens as standard. Machines also comply with the ASTM C39 standard when used together with suitable platens.

Tests can be performed by either Digital Readout Unit or on a computer with using free Software.

The Automatic Core-Rock Compression Testing Machine allow inexperienced operators to perform the tests. Once the machine has been switched on and the specimen is positioned and centered by the help of centering apparatus. The only required operations are;

Setting test parameters, including pace rate (only required when the specimen type is changed). Pressing the START button on the control unit
The machine automatically starts the rapid approach, when the specimen touches the upper platen the rapid approach is ended and starts loading at the pace rate that selected by user and stops once the specimen fails.

Machines consist of;

Load Frame,
Automatic  Hydraulic  Power  Pack, Digital data acquisition & control system,
Distance Pieces, Ø165x30 mm, Ø165x50 mm and Ø165x80 mm,
Upper Platen (with ball seating assembly) Ø165 mm, Lower Platen Ø165 mm,
Loading Cylinder Assembly & Limit Switch for safety, Front and Rear Protective Doors for safety.


Core-Rock Compression Load Frame

Load Frame is 600 kN Capacity.

The dimensions of the 600 kN Load Frame allow the testing of concrete and rock samples up to its capacity.

The load frame provides the stability needed for accurate and repeatable test results over the years of operation. The machine’s hydraulic power pack, control and read out units are positioned on the right hand side of the load frame for easier accessibility, increased productivity and for safer operations.

Upper Platens/Lower Platens

Upper Platen (with ball seating assembly) Ø 165 mm and Lower Platen Ø 165 mm. The platens enable the testing of a wide variety of cylinder or similar samples.

  • Manufactured from high quality steel, which is then hardened, smoothed and finished.
  • The roughness value for the surface texture of the auxiliary platens is ≤ 3.2 µm.
  • Ø 165 mm Upper Platen (with ball seating assembly) and Lower Platen have centering rings on the lower platens for proper centering of 100 mm and 150 mm cylinder samples.

Distance Pieces

Distance pieces are used to reduce the amount of vertical clearance between the upper platen and the lower platen. Supplied with Ø165x30 mm, Ø165x50 mm and Ø165x80 mm distance pieces.

Loading Cylinder Assembly & Limit Switch

The Load Frame has a single acting up stroking ram. The diameter of piston changes with regard to the capacity.
 
The maximum ram stroke is 50 mm, a limit switch is fitted to prevent over travel of the ram which cuts the power to the pump for safety.
 
At the end of the test process to start a new test the piston returns to default position.
 
There is a low friction coaxial PTFE seal between the cylinder and the piston fitted to the cylinder.
 

HYDRAULIC POWER PACK AND DIGITAL DATA ACQUISITION & CONTROL SYSTEM

Hydraulic Power Pack

Automatic Hydraulic Power Pack, dual stage, controlled by digital readout unit is designed to supply the required oil to the load frames for loading. Controller unit has a simple and compact configuration.
Very silent power pack can load the specimen between 1 kN/sec. to 20 kN/sec, with an accuracy of ±5%. A Rapid approach pump is supplied as standard. Safety valve (maximum pressure valve) is used to avoid machine overloading.
 
Maximum working pressure of the system is 400 bar.
 

Dual Stage Pump

The dual stage pump is formed by two groups;

Low pressure gear pump
High pressure radial piston pump

On the dual stage pump, a high delivery, low pressure gear pump is used for rapid approach, while a low delivery, high pressure radial piston pump is used for test execution. The rapid approach facility shortens the time interval from piston start until the upper platen touches to the specimen. This excellent feature helps to save a lot of time when a large number of specimens are going to be tested.

 

Motor

The motor which drives the dual pumps in an AC motor and it is controlled by motor inverter. The variation in the oil flow is executed with the variation of the rotation speed of the motor.

 

 

Distribution Block

A distribution block is used to control the oil flow direction supplied by the dual stage pump, the following parts are fitted to the distribution block; Solenoid valve, Safety valve (max. pressure valve), High Precision Pressure Transducer, Low pressure gear pump and High pressure radial piston pump.

High Precision Pressure Transducer

The NATEK range of Automatic Machines can be upgraded with option High Precision Pressure Transducer special calibration Class 1 starting from 1% of the full range.
 
This unique performance enables the machines to be used for a considerable number of applications including:
 
  • Early age (2 or 3 days) compression strength tests
  • Flexural and splitting tests by using proper accessories
  • Mortar (Cement) compression tests by using proper accessories
  • Core Testing
 

Load Cell

600 kN Load Cell can be used for load measurements instead of High Precision Pressure Transducer. These property allows high accuracy at very low sample failures. (Class 1 at 6 kN to 600 kN)
The user can choose Load Cell or Transducer in the order stage.

Oil Tank

The tank includes enough oil to fill the mechanism which pushes the ram during the test. The level and oil temperature can be seen on the indicator fitted to the tank. It has 25 L capacity. Hydraulic motor oil, number 46, must be used.

Digital Data Acquisition & Control System

The unit is designed to control the machine and processing of data from load-cells and pressure transducers which are fitted to the machine.

All the operations of the unit is controlled from the front panel consisting of a LCD display and function keys.

The unit has easy to use menu options.

Digital graphic display unit loading rate of the time of Testing and load values can be monitored.

Digital graphic display is able to draw real-time “Load vs. Time”.

Software

Sample, company, laboratory and test values can be entered in the programme. Load-time graphic, test reports and sample reports can be taken.

Software provides test data, results, and the load-time graphs can be seen at LCD screen.

The Automatic Core-Rock Compression machine can be controlled (Start, Stop commands) by a computer with the software free of charge. This software provides data acquisition and management for compression, tensile and splitting tensile test throughout the test execution. The advanced functions for data base management provide an easy navigation of all saved data. The test results certificate includes all descriptive information. Therefore, test parameters can be set and details about the test carried out such as client details, test type, specimen type, user info and other information required can be entered and printed out as well as test report and graph.

Software can be performed in Turkish and English.

Test results, graphics and properties of 24 different specimens can be saved in one folder. Old test folders can be reviewed.

User can highlight all 12 different specimen curves in different colors on the graphics.

Frequently used information like name and location of the laboratory, type and dimensions of mostly used specimens are held in memory and can be written automatically by right clicking on information boxes and selecting frequently used text in menu.

User can access any data of previously completed tests and use in his/ her new report since most of the tests have same structure and properties.

Main Features

  • Pace rate control from 1 kN/sec to 20 kN/sec depending on piston size.
  • Can control 2 frames (optional)
  • Can make test with load control.
  • Real time display of test graph.
  • Analog channels for different frame load cells
  • RS-232 serial port connecting for computer interface
  • LCD display
  • 2 different unit system selection; kN and kgf
  • Multi-language support (English and Turkish)
  • 2 different unit system selection; SI and Metric
  • Real-time clock and date
  • Free of charge PC software for the test control and printout the test report.

Safety Features

  • Maximum pressure valves to avoid machine overloading
  • Piston travel limit switch
  • Emergency stop button
  • Software controlled maximum load value
  • Front and rear transparent durable Plexiglas guards