Soil

CBR/MARSHALL/ITS/UCS – PRESS

CBR press apparatus is used to perform California Bearing Ratio (CBR) tests, which evaluate the strength of soil and base materials in road construction. This test is crucial for pavement design as the CBR value helps determine the necessary thickness and composition of road layers. 

Here’s a more detailed explanation:

1. Purpose of CBR Testing:
  • Pavement Design:
    CBR tests determine the strength of soil subgrades and base courses, which are essential for designing pavements that can withstand traffic loads. 

  • Material Evaluation:
    The tests provide a standardized measure of the relative strength of materials used in road construction, ensuring that they meet specific performance requirements. 

  • Cost Optimization:
    CBR values help engineers determine the optimal thickness and composition of pavement layers, potentially reducing construction costs by minimizing unnecessary material usage. 

2. How CBR Press Apparatus Works:
  • Sample Preparation:
    Soil samples are compacted into cylindrical molds, simulating the conditions in the roadbed. 

  • Penetration Test:
    A standard penetration piston is used to force a load into the soil sample at a controlled rate. 

  • Load Measurement:
    The pressure required to penetrate the soil is measured and compared to the pressure required to penetrate a standard crushed rock material. 

  • CBR Value Calculation:
    The CBR value is the ratio of the pressure required to penetrate the test sample to the pressure required for the standard crushed rock material. 

3. Types of CBR Press Apparatus:
  • Manual CBR Press:
    These machines use a manual screw jack to apply the load and are often used in laboratories or field settings. 

  • Motorized CBR Press:
    These machines use a motorized system to apply the load at a controlled speed, making them more precise and efficient for automated testing. 

  • Field CBR Test Apparatus:
    These portable devices are designed for conducting CBR tests in the field, allowing for in-situ testing of soil properties. 

4. Key Components of CBR Press Apparatus: 

  • Frame: A sturdy frame provides a stable platform for the test.
  • Piston: A standard penetration piston is used to apply the load.
  • Load Ring: Measures the applied load.
  • Dial Gauge: Measures the penetration depth.
  • Control System: Allows for precise control of the loading rate and penetration depth.

 

5. Benefits of Using CBR Press Apparatus:
  • Standardization: CBR tests are conducted using standardized procedures, ensuring consistent and reliable results. 
  • Efficiency: Automated CBR presses allow for faster and more efficient testing. 
  • Accuracy: Precise measurement of load and penetration depth ensures accurate CBR value determination. 
  • Versatility: CBR presses can be used for various soil types and applications. 

 

Fully automatic sample tester for soils & asphalt.  The machine features a rigid two column frame with upper crossbeam, which can be adjusted in height and locked in position with lock nuts. 

This compression machine can perform California Bearing Ratio (CBR), UCS, ITT and Marshall tests for both TMH & SANS methods.

Supplied with:
* Penetration weight
* Swivel head
* Penetration Piston/Needle
* Instruction Manual
* Verification Certificate

Data Acquisition software – Optional.

SANAS certificate of calibration – Optional – Onsite calibration can be requested once Press is onsite and installed.

 

 

 

Older A – Frames can be upgraded to new SANS specs.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Click Below for Operating Manual:

CBRUCS MANUAL