Question

During CBR test, the load sustained by a re-moulded soil specimen at \(5\,\mathrm{mm}\) penetration is \(50\,\mathrm{kg}\). The CBR value of the soil will be

• A. \(10\%\)
• B. \(5\%\)
• C. \(3.6\%\)
• D. \(2.4\%\)

Hint:

Standard CBR loads: \[ \boxed{ \begin{aligned} 2.5~\mathrm{mm} &: 1370~\mathrm{kg} 5~\mathrm{mm} &: 2055~\mathrm{kg} \end{aligned} } \]

Answer 1

The Correct Option is D

Step 1: Use the CBR formula. \[ \mathrm{CBR} = \frac{\text{Test Load}}{\text{Standard Load}} \times100 \] At \(5\,\mathrm{mm}\) penetration, \[ \text{Standard Load}=2055~\mathrm{kg}. \]

Step 2: Substitute the values. \[ \mathrm{CBR} = \frac{50}{2055}\times100 = 2.43\% \approx 2.4\%. \] Hence, \[ \boxed{(D)} \] is the correct answer.