Soil

CBR/MOD MOULDS & ACCESSORIES

CBR (California Bearing Ratio) mould sets are used to prepare soil samples for CBR testing, a standard laboratory test used to assess the strength and bearing capacity of soil subgrades and pavement materials. The mould set allows for the creation of a standardized soil specimen, which is then subjected to penetration testing to determine its CBR value. 

Overview of CBR Mould Set Components and Function:
  • Mould Body:
    A cylindrical, steel mould with a specific diameter (typically 152mm) and height (127mm) to house the soil sample. 

  • Compaction Collar:
    An extension collar that fits on top of the mould to provide extra space for compaction. 

  • Perforated Base Plate:
    A base plate with small holes to allow water to drain during the soaking test. 

  • Other components:
    May include spacer discs, filter papers, and weights to facilitate the testing process. 

How the CBR Mould Set is Used:
  1. 1. Sample Preparation:
    The soil sample is placed in the mould body and compacted using a soil compaction hammer or mechanical compactor. 

  2. 2. Specimen Preparation:
    The compacted soil is then trimmed to the desired height and prepared for the penetration test. 

  3. 3. Penetration Test:
    A plunger is forced into the soil sample at a controlled rate, and the load required for penetration is measured. 

  4. 4. CBR Calculation:
    The CBR value is calculated based on the measured load and a reference standard material. 

Importance of CBR Testing:
  • Pavement Design:
    CBR values are a key factor in determining the thickness and composition of road pavements. 

  • Subgrade Evaluation:
    The CBR test provides valuable information about the bearing capacity of soil subgrades, which is crucial for road construction and foundation design. 

  • Material Quality Control:
    CBR testing helps ensure that pavement materials meet the required strength standards. 

In summary, the CBR mould set is a crucial piece of equipment in the laboratory evaluation of soil and pavement materials, allowing for the standardized preparation of soil specimens and the accurate determination of their bearing capacity, which is essential for various civil engineering applications. 

 

  • C.B.R. mould 152,4mm dia x 152,4mm
  • C.B.R.collar 152,4mm dia x 70mm
  • Split Mould
  • C.B.R. perforated Base Plate
  • Soaking weight with adjustable stem 4,536kg
  • Penetration weight 5,56kg
  • Penetration Needle
  • Straight – edge with bevelled edge
  • Compaction Base Plate with Spacer
  • Compaction Rod 16mm x 600mm
  • C.B.R. Disc

Reliance manufactures according to SANS methods.