Lab Test
Standard(s): BS 1377-2:2022
Laboratory California Bearing Ratio CBR

The Laboratory California Bearing Ratio (CBR) Test measures the strength of soil for use in road construction and sub-base design. It assesses the pressure required to penetrate a soil sample with a standard plunger and compares it to the pressure needed for equal penetration in a standard crushed rock material.

The Process

  1. Sample Preparation: A representative soil sample is collected and compacted into a cylindrical mold to simulate in-situ conditions.
  2. Penetration Test: A plunger with a standard area is used to apply pressure to the compacted soil. The penetration depth and corresponding pressure are recorded.
  3. Comparison and Calculation: The measured pressure is then divided by the pressure required to achieve the same penetration in a standard crushed rock. The result is expressed as the California Bearing Ratio (CBR).

Why Is This Test Important?

  • Soil Strength Evaluation: The CBR value provides an indication of the strength and load-bearing capacity of soil, which is essential for designing pavements, road foundations, and sub-bases.
  • Quality Assurance: Ensures that the soil meets the necessary specifications for use in road construction and foundation work.
  • Material Suitability: Helps determine the suitability of the soil for different applications, with higher CBR values indicating stronger, more durable materials.

The Laboratory CBR Test is a vital method for assessing soil suitability for construction projects, particularly in road and foundation engineering. Contact us for reliable and accurate testing.

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Lab Test
Laboratory California Bearing Ratio CBR

The Laboratory California Bearing Ratio (CBR) Test measures the strength of soil for use in road construction and sub-base design. It assesses the pressure required to penetrate a soil sample with a standard plunger and compares it to the pressure needed for equal penetration in a standard crushed rock material.

The Process

  1. Sample Preparation: A representative soil sample is collected and compacted into a cylindrical mold to simulate in-situ conditions.
  2. Penetration Test: A plunger with a standard area is used to apply pressure to the compacted soil. The penetration depth and corresponding pressure are recorded.
  3. Comparison and Calculation: The measured pressure is then divided by the pressure required to achieve the same penetration in a standard crushed rock. The result is expressed as the California Bearing Ratio (CBR).

Why Is This Test Important?

  • Soil Strength Evaluation: The CBR value provides an indication of the strength and load-bearing capacity of soil, which is essential for designing pavements, road foundations, and sub-bases.
  • Quality Assurance: Ensures that the soil meets the necessary specifications for use in road construction and foundation work.
  • Material Suitability: Helps determine the suitability of the soil for different applications, with higher CBR values indicating stronger, more durable materials.

The Laboratory CBR Test is a vital method for assessing soil suitability for construction projects, particularly in road and foundation engineering. Contact us for reliable and accurate testing.

BS 1377-2:2022