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Section 3: Investigation Process

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3.1 Overview

Responsibilities for MNT – Pavement Asset Management and the requesting district/division will be determined during the preliminary project meeting. Table 12-1 describes the investigation process.

Anchor: #i1000960Table 12-1: Investigation Process


Required Action


Conduct preliminary project meeting and perform on-site investigation. The district should provide the following information:

  • District/division contact(s),
  • Pavement history (such as date of initial construction, overlays, and widening),
  • Pavement structure and materials information used in design and any modifications made during construction,
  • Traffic information,
  • Description of the predominant distress or failure modes,
  • Construction records relevant to the problem (including acceptance testing, construction inspection findings, weather conditions, etc.), and
  • Soil and geologic information.


Formulate action plan for detailed investigation based on background information, the preliminary meeting, and on-site investigation. Detailed condition survey may include:

  • Surface distress condition,
  • Ground Penetrating Radar,
  • Dynamic Cone Penetration,
  • Falling Weight Deflectometer (FWD),
  • Total Pavement Analysis Device (TPAD),
  • Core Rig,
  • Materials sampling and testing, and
  • Other testing as required.


Coordinate the following activities:

  • Review and analysis of relevant project records. Sampling and laboratory testing of materials.
  • Traffic control.
  • Equipment and personnel to acquire material samples.
  • Equipment and personnel for repair of cored or trenched sections.


  • MNT – Pavement Asset Management will analyze data and identify most likely causes of problem.


MNT – Pavement Asset Management will present findings/recommendations to the district through a technical report and a presentation. The report will consist of the following:

  • Project history and background,
  • Review of project records,
  • Traffic history and projections,
  • Description of pavement structure, soil conditions, material types, pavement condition, and distress types,
  • Summary of evaluation/testing strategies employed, and the determined distress mechanism, and
  • Project recommendations prioritizing corrective strategies and necessary changes to process and procedures.


  • Monitor project subsequent to corrective measures to assess effectiveness, and
  • Provide periodic feedback to MNT – Pavement Asset Management regarding the effectiveness of the repair strategy.

If you have any questions, need additional information, or copies of investigation reports, contact the director of MNT – Pavement Asset Management.

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