AZA 0911 CALIFORNIA BEARING RATIO APPARATUS (BS VERSION MOULD)

Description

California Bearing Ratio (CBR) Apparatus – BS Version Mould is a laboratory testing setup designed to determine the bearing capacity and strength of subgrade soil used in the construction of pavements, highways, runways, and other infrastructure. The test is widely accepted as a fundamental method for soil strength classification, particularly for road foundation design.

This apparatus features a mould designed as per the British Standard (BS 1377), ensuring accurate, repeatable results during laboratory testing. It helps engineers assess the penetration resistance of compacted soil samples when subjected to a standardized piston load.California Bearing Ratio, CBR Apparatus, BS Version Mould, Soil Testing.

Applications

The CBR Apparatus (BS Version) is crucial for:

• Road and pavement design

• Subgrade and base course strength evaluation

• Airport runway foundation studies

• Soil compaction quality control

• Research and educational use in geotechnical labs

The test mimics field conditions by applying a load through a piston and measuring resistance. The resulting CBR value reflects the percentage load the soil can bear compared to a standard crushed stone.

Construction & Features

This version includes the CBR mould assembly conforming to BS specifications, typically measuring 152 mm internal diameter and 178 mm height, with a detachable base plate and extension collar. The apparatus also includes:

• A loading frame (hand or motorized)

• Penetration piston with dial gauge or digital display

• Annular and slotted weights

• Spacer disc and perforated plate

• Soaking tank (optional for soaked CBR test)

Materials used are corrosion-resistant, ensuring long operational life and precision under repetitive lab conditions.

Compliance and Standards

The CBR test procedure and apparatus comply with the following standards:

• BS 1377 Part 4 – Methods of Test for Soils for Civil Engineering Purposes

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

• IS 2720 Part 16 – Indian Standard for Laboratory Determination of CBR

You may refer to ASTM D1883 standard for reference on U.S. procedural equivalence.

Key Benefits

• Provides accurate assessment of subgrade soil strength

• Essential for foundation and pavement design

• Durable construction and repeatable results

• Includes all components as per BS configuration

• Supports soaked and unsoaked testing methods

Specifications:

FREQUENTLY ASKED QUESTIONS (FAQ):

Q1: What is the function of a CBR apparatus?
A1: It is used to measure the bearing capacity of soil by evaluating how much resistance it offers to a standard piston, simulating load-bearing scenarios.

Q2: Why use the BS version of the mould?
A2: The BS version ensures compatibility with British Standard test procedures (BS 1377), required for many international infrastructure projects.

Q3: Can this apparatus perform both soaked and unsoaked tests?
A3: Yes, it supports both methods. A soaking tank is required for soaked tests to simulate worst-case water infiltration conditions.

Q4: What types of loading frames are compatible?
A4: Both hand-operated and motorized loading frames with 50–100 kN capacity can be used, depending on lab setup.

Q5: Is it suitable for field testing?
A5: No, this apparatus is designed specifically for controlled laboratory conditions.