California Bearing Ratio
The California Bearing Ratio Test (CBR Test) is a penetration test developed by California State Highway Department (U.S.A.) for evaluating the bearing capacity of sub grade soil for design of flexible pavement.
Tests are carried out on natural or compacted soils in water soaked or un-soaked conditions and the results so obtained are compared with the curves of standard test to have an idea of the soil strength of the sub grade soil.
Laboratory CBR Apparatus meets the essential requirements of IS:2720 (Part XVI) with the mould as per of IS:9669. The field CBR Apparatus meets the requirements of IS:2720 (Part XXXI).
The apparatus consists of :-
- Hand Operated Load Frame, capacity 5000 kg (50 KN).
- CBR Mould 150 mm base plate and collar inner dia x 175 mm high.
- Cutting collar.
- Perforated swell plate.
- Spacer disc.
- Metallic ring made of mild steel.
- Metal tripod aluminum.
- Penetration Piston Assembly.
- Proving ring 10 kN capacity.
- One surcharge weight, 2.5 kg, annular.
- One surcharge weight, 2.5 kg slotted.
- Dial gauge 0.01 x 25mm