In Place Nuclear Density Testing to Determine the % Compaction

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In Place Nuclear Density Testing to Determine the
Compaction
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What to Know?

• Determine that the soil being tested is from the
  same source and soil type for which the proctor
  test was performed.
• For each soil type specific compaction methods
  are required to achieve the required compaction.
• Cohesive Static Sheepsfoot
• Granular Vibratory Smooth Drum
• Most specifications will require that the
  moisture content be maintained at 2 of optimum
  to achieve its maximum density.
• Verify that the thickness of the material placed
  does not exceed the compaction ability of the
  equipment used.

3

• Various compaction methods are available for
  differing soil types.
• Shown
• Sheepsfoot
• Padfoot
• Vibratory Roller
• Grid Roller

4
Radiation Safety

• The Nuclear Density Gauge has three radioactive
  sources located within the unit.
• Cesium, Radium and Amercurium.
• The sources are encapsulated in lead shielding
  the Radioactive waves.

5
Protecting Yourself from Radiation Exposure

• Limit the time of gauge use therefore decreasing
  the amount of exposure.
• Carry the gauge at arms length reducing the
  exposure to the soft internal organs.
• Wear a radiation badge and send it in regularly
  to monitor the level of exposure.
• Never stand directly in front of the gauge when
  the source is exposed during servicing.

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How Does the nuclear density gauge operate in the
Field?

• Calibrate the gauge to the environment
• Input the proctor value
• Drive pin in ground to create hole
• Place gauge over hole and extend rod
• Run test and confirm results

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How Do We Determine Actual Field Density?

• Nuclear Densometer

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Reporting of Findings

• Adequate testing performed to verify that the
  project specifications have been met.
• Accurate recording of locations and elevations
  tested with the test results.
• Overall record of the total quantity of fill
  material placed and conformance to the required
  specifications.