AZA 0910 CALIFORNIA BEARING RATIO APPARATUS(ASTM VERSION MOULD)

Description

The California Bearing Ratio (CBR) Apparatus – ASTM Version Mould is an essential piece of geotechnical lab equipment used to determine the bearing strength of subgrade soils and base materials. This ASTM-compliant version features moulds and components designed specifically to meet the requirements of ASTM D1883, ensuring accurate and standardized results during laboratory testing.

Primarily used in the design of roads, airfields, and pavement foundations, the CBR test evaluates how well the soil resists penetration by a piston under controlled moisture and compaction conditions. The resulting CBR value helps engineers classify soil quality and suitability for foundation layers.California Bearing Ratio, CBR Apparatus, ASTM Version Mould, Soil Strength Test.

Applications

This apparatus is vital for:

• Evaluating subgrade strength for highways and runways

• Designing base and sub-base layers in road construction

• Comparing different soil types under compaction

• Soil stabilization and improvement studies

• Laboratory soil quality control in infrastructure projects

Both soaked and unsoaked CBR tests can be performed using this equipment, simulating worst-case conditions such as heavy rainfall or waterlogging.

Construction & Features

The ASTM version mould differs slightly from BS designs, typically featuring:

• Mould diameter: 6 inches (152 mm)

• Height: 7 inches (177.8 mm)

• Detachable base plate

• Removable extension collar

The full set includes:

• CBR mould with base and collar

• Penetration piston (50 mm dia.) with adjustable loading stem

• Dial gauge or digital displacement indicator

• Annular and slotted surcharge weights (typically 2.5 kg each)

• Spacer disc and perforated plate

• Optional soaking tank for wet CBR testing

• Loading frame (manual or motorized)

All parts are manufactured using corrosion-resistant steel and precision-machined for long service life and testing accuracy.

Compliance and Standards

This equipment fully complies with:

• ASTM D1883 – Standard Test Method for CBR of Laboratory-Compacted Soils

• AASHTO T193 – CBR of Laboratory-Compacted Soils

• Compatible with ASTM D698 and ASTM D1557 compaction tests

For reference, see the ASTM D1883 standard detailing CBR procedures.

Key Benefits

• Precision-engineered components for ASTM-compliant testing

• Suitable for use with motorised or manual load frames

• Durable design for long-term laboratory use

• Supports soaked/unsoaked testing configurations

• Clear CBR value output for pavement design decisions

Specifications:

FREQUENTLY ASKED QUESTIONS (FAQ):

Q1: What is the difference between ASTM and BS CBR moulds?
A1: ASTM moulds are generally 6 inches (152 mm) in diameter and 7 inches tall, whereas BS moulds have slightly different dimensions. ASTM designs comply with U.S. standards for road design.

Q2: Can this be used for both soaked and unsoaked CBR tests?
A2: Yes, with the addition of a soaking tank and appropriate surcharge weights, both types of tests can be conducted.

Q3: Is the apparatus suitable for field use?
A3: No, this version is specifically designed for controlled laboratory testing.

Q4: Can it be paired with a motorised load frame?
A4: Absolutely. It works with both motorised and hand-operated frames that offer the required load capacity.

Q5: What is the CBR value used for?
A5: It’s used to assess the strength of subgrade soils and base layers for designing pavements and roadways.