The traditional procedure for a CBR Test involved penetrating a plunger of diameter into a soil sample using a Load Frame (usually controlled by some mechanical device) using a Load Ring for measuring Vertical Load and the Displacement quantified utilizing Mechanical Dial Gauges. This required the lab technician to be on hand with a clipboard and datasheet(s) to record the information when required during the Evaluation.
The VJ Tech Triplex Load Frame required the CBR Exam to a new degree. An inbuilt microprocessor allowed a stepper motor to correctly control the movement with an easy to use control panel and a massive LCD screen. Adjustable comparison on the Load Frame enabled the lab technician to set the adjusted CBR speeds and rates of travel demanded (stress rates of 0.00001 – 50.8000mm/min), with big keys for UP, DOWN, STOP, quick UP and FAST DOWN control platen alteration rate if required.
Furthermore, new hardware has been developed that helped the lab technician in many ways. A Load Cell substituted the Load Ring (for Horizontal Load) and LSCT or Potentiometric Transducers substituted Mechanical Dial Gauges for the Vertical Displacement dimension.
The improvements in computing power meant that applications could be developed to control the different stages of this CBR evaluation, representing a huge step ahead. You can also check out cbr testing
The famous Clisp Studio csCBR software module running on the computer managed to:
- Conform to all major international geotechnical standards.
- Setup and Control the Instruments and Transducers used at the CBR Test.
- Calibrate the Transducers if demanded.
- Set default starting states, data logging parameters, and halting conditions for both the Soaking and Evaluation stages.
- Display live views of detector readings and standing.
- Display reside data views, tables, and graphs as the test progresses.
- Provide complete results information that could be exported to external information processing packages for additional manipulation if required.
- Even though the CBR test was automated, the test still required an additional Data Logger.
When VJ Tech introduced the Triplex II Advanced into the market, it obviated the need for a Data Logger because the Instrument contains 4 analog input channels on the rear panel. This allowed Load and Displacement data to be logged (with 2 additional channels for other Load abilities to be installed should they be required) and then forwarded directly to the pc. It also lets the User pick fixed rates for BS (1.2 mm/min) or ASTM (1.27 mm/min) and included an on-screen display of both transducer channels along with a Peak hold display.