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In CBR test the value of CBR is calculated at
  • a)
    2.5 mm penetration only
  • b)
    5.0 mm penetration only 
  • c)
    7.5 mm penetration only
  • d)
    Both 2.5 mm and 5.0 mm penetrations
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
In CBR test the value of CBR is calculated ata)2.5 mm penetration only...
In CBR test the value of CBR is calculated at both 2.5 mm and 5.0 mm penetration, Normally the CBR value at 2.5 mm penetration which is higher than that at 5.0 mm is reported as the CBR value of the material.
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In CBR test the value of CBR is calculated ata)2.5 mm penetration only...
CBR Test and Calculation

What is CBR Test?
CBR (California Bearing Ratio) test is a penetration test to determine the bearing capacity of subgrade, subbase and base course materials. The test is performed by measuring the pressure required to penetrate a soil sample with a plunger of standard area. The measured pressure is then used to calculate the CBR (California Bearing Ratio) of the soil.

How is CBR value calculated?
The CBR value is calculated as the ratio of the pressure required to penetrate a standard soil sample with the plunger of standard area at a depth of 2.5 mm or 5.0 mm to the pressure required to penetrate the same soil sample with the plunger of standard area at the same depth.

At what penetration depths is CBR value calculated?
The CBR value is calculated at both 2.5 mm and 5.0 mm penetration depths. The pressure required to penetrate the soil at these depths is measured and the CBR value is calculated using the above formula for both depths.

Why is CBR value calculated at multiple depths?
The CBR value is calculated at both 2.5 mm and 5.0 mm depths to determine the strength of the soil at different depths. The soil strength varies with depth and the CBR value at different depths is used to determine the thickness of the subgrade, subbase and base course materials required for a given pavement structure.

Therefore, the correct answer is option 'D' which states that the CBR value is calculated at both 2.5 mm and 5.0 mm penetration depths.
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In CBR test the value of CBR is calculated ata)2.5 mm penetration onlyb)5.0 mm penetration onlyc)7.5 mm penetration onlyd)Both 2.5 mm and 5.0 mm penetrationsCorrect answer is option 'D'. Can you explain this answer?
Question Description
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