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CBR Method

In CBR test, ...

Question

In CBR test, surcharge weights are used to

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Solution

Simulate the effect of overlying pavement

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Q. A subgrade soil sample was tested using standard CBR apparatus and the observations are given below

\begin{matrix} Load, kg & Penetration, mm 55 & 2.5 75 & 5.0 \end{matrix}

Assuming that the load-penetration curve is convex throughout, the CBR value (in %) of the sample is

Q. A subgrade soil sample was tested using standard CBR apparatus and the observations are given below

\begin{matrix} Load (kg) & Penetration (mm) 60.5 & 2.5 80.5 & 5.0 \end{matrix}

Assuming that the load-penetration curve is convex throughout, the CBR value(%) of the sample is

Q. A subgrade soil sample was tested using standard CBR apparatus and the observations are given below :

\begin{matrix} Load, kg & Penetration, mm 60 & 2.5 80 & 5 \end{matrix}

Assuming that the load-penetration curve is convex throughout, the CBR value (%) of the sample is

Q. The initial concavity in the load- penetration curve of a CBR test is NOT due to

Q. Which of the following corresponds to the recommendations of IRC for pavement thickness determination by CBR method?

1. CBR tests are to be conducted in-situ
2. Static compression is best adopted
3. The top 50 cm of subgrade should be compacted to as near the proctor density as possible

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