Earthwork Construction Inspection Flashcards

What action should an inspector take if a nuclear gauge reading shows compaction below the required density?

Answer: Reject the lift and require the contractor to re-compact and retest

If a density test fails, the inspector must reject the lift, require additional compaction, and retest before any overlying material is placed.

What is the purpose of moisture-density relationship testing (Proctor test) in earthwork?

Answer: To establish the target density and optimum moisture for field compaction

The Proctor test establishes the maximum dry density and optimum moisture content of a soil, providing the target values that field compaction must achieve.

What is 'select material' in FDOT embankment specifications?

Answer: Higher-quality material meeting specific gradation and bearing requirements used in upper embankment zones

Select material meets more stringent quality requirements and is used in the upper portion of the embankment (typically top 12 inches) to provide a stable platform for pavement.

When should an earthwork inspector verify grades and cross-sections?

Answer: Before and after earthwork operations at each station

Inspectors should verify grades and cross-sections both before earthwork begins (existing ground) and after completion of each earthwork operation to ensure specification compliance.

What is the purpose of a 'toe of fill' in embankment construction?

Answer: The bottom edge of a fill slope where it meets existing ground

The toe of fill is the bottom boundary where the embankment slope meets the existing natural ground surface, and its location must be controlled to match plan dimensions.

What is a 'settlement monument' used for in earthwork inspection?

Answer: A device installed to monitor vertical movement of embankments over time

Settlement monuments are installed in embankments over soft subgrades to measure post-construction settlement and determine when it is safe to place pavement.