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What is the CBR value for sub grade in road construction?

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Asked: July 16, 20202020-07-16T15:24:25-07:00 2020-07-16T15:24:25-07:00In: Construction
fathima
fathima

fathima

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fathima Beginner

What is the CBR value for sub grade in road construction?

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  1. Komal Bhandakkar

    Komal Bhandakkar

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    Komal Bhandakkar AUTHOR
    2020-09-08T23:13:42-07:00Added an answer on September 8, 2020 at 11:13 pm
    What is the CBR value for sub grade in road construction?

    CBR value for subgrade in road construction in India :

    Introduction :

    California bearing ratio(CBR) value is used to decide the thickness of road pavement


    CBR value for subgrade in road construction in India 

    IRC: 37-2012 = 3 – 15%


    CBR value for

    • Clay soil: less than 8
    • Sand: 15 -35
    • Gravel: 25 and more than that

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  2. DevilAVRT

    DevilAVRT

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    DevilAVRT Beginner
    2020-07-16T16:15:19-07:00Added an answer on July 16, 2020 at 4:15 pm

    3% to 15%

    In India IRC: 37–2012 is used for design of flexible pavements. It gives design charts for pavement on the basis of CBR value for subgrade material ranging from 3% to 15%. However for subbase layer, MR (modulus of resilience) value is now considered.

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  3. Vivek Patel

    Vivek Patel

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    Vivek Patel User
    2020-07-17T13:59:48-07:00Added an answer on July 17, 2020 at 1:59 pm

    CBR value for subgrage indicate subgrade material quality

    CBR value is taken at 2.5mm & 5 mm penitration.

    For road construction we use irc37 code

    in subgrade material CBR value should be nearly 15-19% .

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  4. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru
    2020-11-29T16:32:40-08:00Added an answer on November 29, 2020 at 4:32 pm

    A clayey soil generally has a low CBR value (less than 8). Sands are more granular and drain better and will generally have CBR values between 15 and 35. Gravel will have the best CBR values, generally 25 and up. That is why it is suggested to save the best material to cap the subgrade.

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