Practice question

Per NMDOT 2019 606.3.7, embankment material at guardrail shall be compacted to what density?

  1. 90% of AASHTO T 99 Standard Proctor, Method A
  2. 100% relative density by ASTM D 4253 only
  3. No compaction is required behind metal barrier
  4. 95% of maximum density per AASHTO T 180 (Modified Proctor), Method D (TTCP Modified)

Answer: D — 95% of maximum density per AASHTO T 180 (Modified Proctor), Method D (TTCP Modified)

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