California Bearing Ratio [CBR] Test Machines
The California Bearing Ratio (CBR) test is a measure of the strength of subgrade soil and highway sub base and subgrade via a penetration test. It is designed for testing cohesive materials with a particle size less than 19mm.
Laboratory Machines
CBR Test Machine with Load Ring – UTS-0852
This machine includes a load ring and dial gauge and is used to measure force and piston travel. Two travel speeds 1mm/min & 4mm/min. 50 kN capacity
CBR Test Machine with Digital Readout – UTS-0854
This machine includes digital force and a travel readout. Two travel speeds 1mm/min & 4mm/min. 50 kN capacity.
Automatic CBR Test Machine – UTS-0860
- Variable ram speed between 0.5-5 mm/min. Compatible with data acquisition and testing software.
- System will record corrected CBR values at 0.625 1.25 1.875 2.5 3.75 5 7.5 10 12.5 mm, along with the %CBR at 2.5 and 5 mm
- Displacement or load control
- Live test Graph display
- 50 kN capacity
- Excel output
Field Testing Systems – UTS-0865
Onsite evaluation of base and sub base is achievable due to field CBR testing. Sites un-disturbed by construction activity are most preferred when performing the field test. It is also possible to saturate test sites to collect conservative data.
It is also possible to assemble the machine with conversion frame UTS-0867 to create a mechanical CBR test machine.
Accessories
CBR Moulds
CBR Moulds supplied to Australian or International standard, including surcharge weights and other required accessories.
| Product Code | Description |
| UTS-CBR-AUS |
Plated steel mould body with 152.4 dia. x 177.8 mm height, supplied complete with extension collar and perforated base plate |
| UTS-0705 | Spacer Disc with T handle, 150.8 mm dia. x 61.4 mm height |
| UTS-0708 | Annular Surcharge Weight, 2.27 kg |
| UTS-0710 | Slotted Surcharge Weight, 2.27 kg |
| UTS-0712 | CBR Solid Base Plate |
| UTS-0714 | Straightedge 300x30x5 mm |
| UTS-0716 | Filter Paper for CBR Test No:5 x 150 mm dia. (Pack of 100) |
| UTS-0718 | Filter screen, 144 mm dia. 150 μm mesh ASTM |
Automatic Compactor – UTS-0620
Automatic chain drive compactor. The total number of blows and the count of internal and external decreases of mass are determined by a programmable counter.
Supplied with 2.5kg & 4.5 kg hammers suitable for 100 and 150 mm moulds.
Swell Plate and Gauge
Used to observe the swell of a soaking soil sample. As the perforated plate rises a dial gauge displays the swell
Sample Extruders
Extruders are available for CBR, compaction and Proctor moulds along with standard BSP [U4] sample tubes. PCTE offers both manual jack and automated extruders.
Soil Lathe/Trimmer and Extruder - UTS-0160
The UTS-0160 Soil Lathe, Trimmer and Extruder is used to extrude and trim soil samples from 35 mm to 100 mm diameter to reduce samples.
Technical Specifications
Load Ring and Digital Readout System Specification
|
Specification |
|
|
Dimensions (mm) |
650 x 470 x 1150 |
|
Max Vertical Clearance(mm) |
470 |
|
Min Vertical Clearance (mm) |
250 |
|
Horizontal Clearance (mm) |
265 |
|
Basket Diameter (mm) |
133.3 |
|
Basket Stroke (mm) |
25 |
|
Machine Speed (mm/min) |
1.27 |
|
Weight (kg) |
110 |
|
Vertical Stroke (mm) |
80 |
Automatic CBR Test Machine Specifications
| Specification | |
| Model (mm) | UTS-0860 |
| Dimensions L x W x H (mm) | 645 x 470 x 1140 |
|
Weight |
80 |
|
Current Specifications (mm) |
220 V 50 Hz, 1 ph |
| Motor (kW) |
0.75 |
| Test Speed Range (mm/min) |
0.5 > 5 |
| Max Horizontal Clearance (mm) | 260 |
| Max Vertical Clearance(mm) |
690 |
| Min Vertical Clearance (mm) | 260 |
| Max Ram Stroke (mm) | 100 |
Applicable Standards
EN 13286-47
BS 1377:4
ASTM D1883
AS1289.6.1
