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What the SPT N-Value Measures

Easysite investigationSPT
The standard penetration test (SPT) N-value is based primarily on which measurement?
  1. ASoil pH
  2. BHammer blows
  3. CWater content
  4. DAtterberg limit
Show solution

Answer: B. Hammer blows

The field N-value counts hammer blows required to drive the sampler through the final 300 mm (12 in.) of the standard penetration interval, after the initial seating drive. Corrections may then be applied for interpretation.
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