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In CBR test, the value of CBR is calculated at:-
1. 2.5 mm penetration only
2. 5.0 mm penetration only
3. 2.5 mm and 5.0 mm penetration both
4. 7.5 mm penetration only

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Correct Answer - Option 3 : 2.5 mm and 5.0 mm penetration both

Concept:

CBR test is strength test conducted on the soil by introducing surcharge load at the compaction rate of 1.25 mm per minute on a completely soaked soil sample passing through 20 mm sieve size.

\({\rm{CB}}{{\rm{R}}_{\rm{\delta }}} = \frac{{{{\rm{P}}_{\rm{\delta }}}{\rm{\;of\;soil}}}}{{{{\rm{P}}_{\rm{\delta }}}{\rm{\;of\;standard\;crushed\;aggregate}}}} \times 100\)

δ = displacement in mm

Pδ = Load corresponding to ‘δ’ settlement

Ps = Load for standard crushed aggregate:

 At 5 mm penetration Standard load Ps = 2055 kg

 At 2.5 mm penetration standard load Ps = 1370 kg

It is a type of Penetration test, as at every penetration value we note down the load.

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