Question

If the load carried by a soil sample at penetration levels of 2.5 mm and 5.0 mm are 64.6 kg and 91.20 kg respectively then the CBR value of the given soil sample is

• A. 6.436%
• B. 4.715%
• C. 4.438%
• D. 5.236 %

Answer 1

The correct option is B 4.715%

For the given soil sample,
At 2.5 mm penetration, CBR
$=\frac{64.6}{1370}\times 100=4.715\%$
At 5.0 mm penetration, CBR
$=\frac{91.20}{2055}\times 100=4.438\%$
$\therefore$ CBR value will be maximum of two, i.e.
$=4.715\%$