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Proof rolling check list for subgrade

1. Preparation

Verify project specifications and requirements for proof rolling.

Review contract documents and engineering plans.
Identify specific materials and subgrade thickness.
Check for any special testing or monitoring requirements.
Confirm compliance with local regulations and standards.

Ensure the proof rolling equipment is calibrated and in good working condition.

Inspect equipment for mechanical issues or wear.
Calibrate pressure gauges and measurement devices.
Verify tire pressures and operational fluid levels.
Conduct a test run to ensure proper functionality.

Coordinate with site personnel and stakeholders regarding the schedule for proof rolling.

Meet with site supervisors to discuss timelines.
Share the planned proof rolling dates with all parties.
Ensure availability of necessary personnel and equipment.
Confirm communication channels for updates or changes.

2. Site Conditions

Check weather conditions to ensure they are suitable for proof rolling.

Confirm that the subgrade has been properly excavated and graded.

Ensure that the subgrade is free of debris, vegetation, and standing water.

Here are some additional steps that could be included in the "Site Conditions" section of a proof rolling checklist

Verify that the subgrade is adequately compacted to the specified density

Assess the moisture content of the subgrade soil to ensure it is within acceptable limits

Check for any signs of soil instability, such as excessive settlement or heaving

Ensure that the subgrade is properly crowned or sloped to facilitate drainage

Confirm that any required geotechnical testing has been conducted prior to proof rolling

Inspect the surrounding area to ensure that no construction activities could interfere with the proof rolling process

Evaluate the accessibility of the site for the proof rolling equipment

Verify that any necessary permits or approvals for proof rolling are in place

Ensure that there are no overhead or underground utilities that may be affected during the proof rolling process

3. Equipment Setup

Select appropriate proof rolling equipment (e.g., heavy tandem axle truck or vibratory roller).

Ensure that the proof rolling equipment has the correct tire pressure or operating parameters as per project specifications.

Conduct a pre-operation inspection of the equipment.

4. Execution of Proof Rolling

Begin proof rolling in designated areas as per the project plan.

Maintain a consistent speed during proof rolling to ensure uniform compaction.

Monitor the number of passes over each area as per specifications.

5. Observation and Documentation

Observe the subgrade for any signs of distress, such as pumping, cracking, or excessive deflection.

Document the locations and extent of any observed failures or issues.

Record the number of passes and the weight of the proof rolling equipment.

6. Assessment of Results

Evaluate the performance of the subgrade based on observations during proof rolling.

Determine if any areas require additional compaction or remediation.

Prepare a summary report of findings, including recommendations for any necessary corrective actions.

Here are some additional steps that could be included in the "Assessment of Results" section of the checklist

Analyze the consistency of the subgrade across the entire area to identify any variations in strength or compaction

Compare the observed performance with project specifications and design criteria to ensure compliance

Document any visible signs of distress, such as cracking, deformation, or excessive yielding, and their locations

Conduct moisture content testing in areas of concern to determine if moisture levels are affecting performance

Review the proof rolling results in conjunction with previous geotechnical reports to assess potential issues

Identify any patterns or trends in the performance data that may indicate underlying problems with the subgrade

Consult with geotechnical engineers or design professionals regarding areas that need further analysis or remediation

Create a prioritized list of areas needing attention, categorizing them by severity and required action

Discuss findings with the construction team to ensure understanding and agreement on the assessment results

Establish a follow-up schedule for re-evaluation of any areas that underwent corrective actions after initial assessment

7. Follow-Up Actions

Schedule re-proof rolling for any areas that exhibited distress or failure.

Implement recommended remedial actions and verify completion before proceeding with further construction.

Conduct a final review with stakeholders to confirm acceptance of the subgrade.

8. Final Documentation

Compile all documentation, including observations, measurements, and reports.

Include photographs as needed to support findings.

Submit final proof rolling report to project stakeholders for review and approval.

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