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CALIFORNIA BEARING RATIO APPARATUS (BS VERSION MOULD) AZA0911
The AZA0911 California Bearing Ratio (CBR) Apparatus – BS Version Mould from Azalab is a laboratory-grade testing system designed to determine the bearing capacity and strength of subgrade soils used in pavement, highway, runway, and foundation construction. The CBR test is a globally recognized method for soil strength classification and is especially critical for road and pavement design.
This apparatus is manufactured in accordance with BS 1377, featuring a British Standard mould configuration that ensures accurate, repeatable, and internationally acceptable test results. The AZA0911 evaluates soil resistance to penetration under controlled compaction and loading conditions, closely simulating field performance.
Description
Applications
The AZA0911 CBR Apparatus is widely used for:
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Road and pavement foundation design
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Subgrade and base course strength evaluation
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Airport runway and heavy-duty pavement studies
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Soil compaction quality control
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Research, teaching, and training in geotechnical laboratories
The test determines the CBR value, which represents the percentage resistance of the soil compared to a standard crushed stone, forming the basis for pavement thickness design.
Construction & Features
The BS version mould assembly is designed strictly as per British Standard specifications.
BS Standard Mould Construction:
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Internal diameter: 152 mm
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Height: 178 mm (with collar)
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Detachable base plate
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Removable extension collar
Standard Supply Includes:
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BS-standard CBR mould with base plate and collar
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Penetration piston (50 mm diameter)
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Dial gauge or optional digital displacement indicator
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Annular and slotted surcharge weights
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Spacer disc and perforated plate
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Optional soaking tank for soaked CBR testing
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Compatible with manual or motorised loading frames
All components are manufactured from corrosion-resistant mild steel or cast iron, ensuring dimensional stability, long service life, and consistent testing accuracy.
Standards & Compliance
The AZA0911 apparatus complies with the following standards:
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BS 1377 (Part 4) – Methods of Test for Soils for Civil Engineering Purposes
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ASTM D1883 – CBR of Laboratory-Compacted Soils
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IS 2720 (Part 16) – Laboratory Determination of CBR
This allows the apparatus to be used confidently across international projects requiring BS, ASTM, or IS compliance.
Key Benefits
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Accurate determination of subgrade soil bearing strength
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Fully compliant with British Standard CBR requirements
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Suitable for soaked and unsoaked testing methods
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Compatible with manual and motorised loading frames
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Rugged laboratory construction for repeatable results
Specifications
| Feature | Specification |
|---|---|
| Model | AZA0911 |
| Product Type | CBR Apparatus – BS Version Mould |
| Mould Internal Diameter | 152 mm (BS Standard) |
| Mould Height | 178 mm (with collar) |
| Mould Material | Mild Steel / Cast Iron |
| Penetration Piston Diameter | 50 mm |
| Penetration Measurement | Dial Gauge / Digital (0.01 mm resolution) |
| Loading Frame Capacity | 50 kN or 100 kN (manual or motorised) |
| Surcharge Weights | Annular / Slotted – 2.5 kg & 5 kg |
| Testing Type | Soaked and Unsoaked CBR |
| Standards Compliance | BS 1377, ASTM D1883, IS 2720 (Part 16) |
| Application | Laboratory soil testing for CBR |
Frequently Asked Questions (FAQ)
Q1: What is the function of a CBR apparatus?
It measures the bearing capacity of soil by evaluating its resistance to penetration under standardized loading conditions.
Q2: Why use the BS version mould?
The BS version is required for projects and laboratories that follow BS 1377 procedures, particularly in UK-based and international infrastructure projects.
Q3: Can both soaked and unsoaked tests be performed?
Yes. With the addition of a soaking tank, soaked CBR tests can be carried out to simulate worst-case moisture conditions.
Q4: What loading frames are compatible?
Both hand-operated and motorised loading frames with 50–100 kN capacity are suitable.
Q5: Is this apparatus suitable for field testing?
No. AZA0911 is designed exclusively for controlled laboratory environments.
Additional information
| Mould Diameter |
152 mm (BS Standard) |
|---|---|
| Mould Height |
178 mm (with collar) |
| Material |
Mild Steel / Cast Iron |
| Loading Frame Capacity |
50 kN or 100 kN (Manual/Motorized) |
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