Which one of the following states of field compaction of sand deposit truly represents the corrected standard penetration test value: N (corrected) = 27?
A
Loose
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B
Medium dense
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C
Dense
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D
very dense
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Solution
The correct option is B Medium dense According to Terzaghi and Peck, the following correlation between correct N value and compactness are useful:
N-value Compactness
0 - 4 Very loose
4 -10 Loose
10 - 30 Medium dense
30 - 50 Dense
> 50 Very dense
N = 27 corresponds to medium dense sands.