CBR Test Apparatus For The Test of Tube Making and The Bottom Bearing Ratio
The Lab CBR Test Machine is used for test tube making and conducting bottom bearing ratio tests on various soils and road base materials. The mixture maximum size should be controlled within 25mm, with an absolute maximum of 40mm.
- Open the power switch and check instrument working condition. Verify normal rotation of the handle and ensure all systems are operational before testing.
- Prepare test pieces according to "Highway Base Material Test Code" JTJ075-85 bearing ratio test methodology.
- Measurement of saturated swelling amount involves placing moisture-cured specimens on porous boards with appropriate loading plates to simulate pavement stress conditions.
- Conduct penetration tests using the CBR bearing ratio tester, applying controlled loads and recording measurements at specific penetration intervals.
| Model | Lab CBR Test Machine |
|---|---|
| Speed | 1mm/min, Maximum Pressure: 3T |
| Penetration Bar | φ50mm × 100mm |
| Multi-orifice | 2 |
| Dial Gauge | 0-10mm, Three φ |
| Loading Plate | 6 plates (External diameter: φ150mm, Inner diameter: φ52mm, 1.25Kg each) |
| Test Tube | Inner diameter: φ125mm, Height: 170mm, Cushion block: φ151mm, Height: 50mm |
| Capacity | 30kN, 50kN |
| Load Speed | 1.0mm/min |
| Mold | φ152mm × 170mm |
| Platen | φ170mm |
| Platen Travel | 50mm |
| Weight | 100kg |
| Dimensions | 310 × 310 × 930mm |
The CBR test apparatus is suitable for testing soils and mixed materials (with grain size less than 40mm) compacted with CBR mold to determine the bearing loading capacity of pavement roadbed subcrust and material layers of designed roadbeds. The system features a twin column frame, proving ring, penetration bar, loading plate, micrometer, and measuring device for swell increment, ensuring easy operation and reliable performance.
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