Advanced Materials and Technology - Inspectors Job Guide

AMG Muck Excavation

Obtain log-in password(s) for the AMG muck excavation system from the Contractor for use by MnDOT construction staff and the AMT unit (MaterialsTechnology.dot@state.mn.us). The Contractor must provide the Department with access to the Contractor’s AMG excavation system data prior to the start of excavation efforts requiring the AMG excavation system and until 90 days after final acceptance of all work.
Verify that in-place surface models reflect the existing surface elevation shifted down to the in-place surface (i.e., surface immediately below the bottom of the in-place pavement [i.e., concrete, bituminous, stabilized materials, cement stabilized materials], or topsoil, in areas requiring muck excavation).
Verify that Contractor was supplied with the following files as part of the award package: in-place surface model(s) (LandXML), bottom of muck excavation surface model(s) (LandXML), background file(s) (DGN format), and alignment file(s) (LandXML).
Check with MnDOT surveys that permanent and/or temporary control points are available by the Department for use by the Contractor for site calibration. Provide Contractor with the project map (indicating locations of control points) and coordinates for the control points.
Document that Contractor and Engineer agree on the in-place surface model(s) and AMG bottom of muck excavation surface model(s) to use during the AMG excavation efforts (the agreed upon models constitute as the model of record). Document the file name(s) and date and time stamps, associated with the model of record.
The Contractor must provide an AMG excavation system demonstration date and location to the Engineer at least 7-working days in advance of demonstration.

The Engineer will approve demonstration locations at least 3-working days prior to AMG excavation system demonstrations.
The demonstration location must be within the limits of the site-calibration.
Use form AMT-201 to verify the AMG excavation system calibrations.
Use a rover (or robotic total station) to verify a minimum of 10 locations that are at least 2 feet apart – using varying bucket orientations.
Do not pre-mark locations but move the cutting edge of the excavation equipment to the measurement location to allow measurements to start recording by the AMG system and then mark the verification location after the cutting edge of the excavation equipment is placed on the natural ground.
Ensure that the mark is placed on cutting edge location that is recorded by the AMG system (e.g., left, center, or right edge).

Use AMT-202 form to randomly verify the accuracy of the AMG system’s coordinates using the procedure outlined in S-xx.3.E(2)(b) – (c). Notify the Contractor if any individual check differs by 0.33 feet or more of that measured by the AMG excavation system.
Contact district surveys to independently verify Contractor volume calculations.
For individual pay estimates, export excavated volumes from the first day of excavation, for the given area, to the pay estimate cutoff date. Use the running accumulative total volume less that for the previous pay estimate(s) for excavated volume calculations for a given pay estimate time period.

References: Special Provision (2011) Construction Surveying – Automated Machine Guidance Muck Excavation, Advanced Materials and Technology Unit, Uses of Intelligent Construction Technology (ICT) Guide

AMG Milling Using Relative Surface

Obtain log-in password(s) for access to the AMG as-built milled surface model from the Contractor for use by MnDOT construction staff and the AMT unit (MaterialsTechnology.dot@state.mn.us). The Contractor must provide the Department with access to this data prior to the start of milling efforts requiring the relative AMG method and until 90 days after final acceptance of all work.
Verify that Contractor was supplied with the following files as part of the award package: centerline alignment and final profile (LandXML), existing pavement surface model (LandXML), milled surface model (LandXML), overlay report (Excel).
Contractor must demonstrate that the relative AMG system meets requirements no later than 2 weeks prior to production. Demonstration location and date must be provided to Engineer no later than 7-working days in advance to demonstration. A documented, successfully, completed project from Contractor’s current, or a previous construction season will meet requirements of equipment demonstration.
Contractor must submit an automation technology work plan to Engineer no later than 7 days prior to preconstruction meeting. The Contractor must submit automation technology work plan modifications to Engineer (for review and approval) no later than 7 days after preconstruction meeting, or no later than 7 days prior to start operations requiring the relative AMG milling method, whichever comes first.
Document that Contractor and Engineer agree on the milled surface model to be used during milling operations requiring the AMG milling system (this and the associated files constitute the model of record). Document the file name(s) and date and time stamps, associated with the model of record.
The Engineer will verify that the relative AMG milling system is milling to the required model of record milling depths per Table 2232-3. The Engineer will verify that the milling depths are within plus or minus 0.03 feet of the model of record using a flat edge (e.g., level) and tape measure, and verify the slope using a level. Use a Rover to accurately determine the quality assurance location and associated model data.
It is recommended that form AMT-203 is used by the Engineer for use during random verification checks. For ease, populate this form with the stationing and model of record mill depths and slopes in advance to the start of the AMG milling operation. Contact the Advanced Materials and Technology unit for support.
The Engineer will review and verify that the Contractor’s measurements, provided in form AMT-203, are within plus or minus 0.03 feet of the model of record per the schedule outlined in Table 2232-2.
A hold point for the milling operation occurs should:

The milling machine become inoperable, or the milling system does not mill per the requirements of the provision;
5 percent or more of the milling depths in the Contractor’s AMT-203 form exceed the tolerance of plus or minus 0.03 feet for a given daily report; and/or
50 percent or more independent verification measurements completed by the Engineer exceed the tolerance of plus or minus 0.03 feet over 1,000 continuous linear feet of the milling operation, where the Engineer collects independent verification measurements at a linear increment of 100 feet or less.

References: Special Provision (2232) Mill Pavement Surface – Automated Machine Guidance Milling Using Relative Surface, Advanced Materials and Technology Unit, Uses of Intelligent Construction Technology (ICT) Guide

AMG Milling Using Robotic Total Stations (RTS)

Obtain log-in password(s) for access to the AMG as-built milled surface model from the Contractor for use by MnDOT construction staff and the AMT unit (MaterialsTechnology.dot@state.mn.us). The Contractor must provide the Department with access to this data prior to the start of milling efforts requiring the RTS AMG milling method and until 90 days after final acceptance of all work.
Verify that Contractor was supplied with the following files as part of the award package: centerline alignment and final profile (LandXML), existing pavement surface model (LandXML), milled surface model (LandXML), overlay report (Excel).
The Engineer will provide the following existing permanent and temporary 3D control points (within the project limits) information:

Project map indicating locations of control points
File containing the point name, x-y-z coordinates, and point code description
Available Geodetic Data Sheets

Contractor must demonstrate that the relative AMG system meets requirements no later than 2 weeks prior to production. Demonstration location and date must be provided to Engineer no later than 7-working days in advance to demonstration. A documented, successfully, completed project from Contractor’s current, or a previous construction season will meet requirements of equipment demonstration.
Contractor must submit an automation technology work plan to Engineer no later than 7 days prior to preconstruction meeting. The Contractor must submit automation technology work plan modifications to Engineer (for review and approval) no later than 7 days after preconstruction meeting, or no later than 7 days prior to start operations requiring the relative AMG milling method, whichever comes first.
Document that Contractor and Engineer agree on the milled surface model to be used during milling operations requiring the AMG milling system (this and the associated files constitute the model of record). Document the file name(s) and date and time stamps, associated with the model of record.
The Engineer will verify that the AMG milling system is milling to the required model of record milling depths per Table 2232-4. The Engineer will verify that the milling depths are within plus or minus 0.02 feet of the model of record using a RTS.
The Engineer will review and verify that the Contractor’s measurements, provided in form AMT-203, are within plus or minus 0.02 feet of the model of record per the schedule outlined in Table 2232-3.
A hold point for the milling operation occurs should:

The milling machine become inoperable, or the milling system does not mill per the requirements of the provision;
5 percent or more of the milling depths in the Contractor’s AMT-203 form exceed the tolerance of plus or minus 0.02 feet for a given daily report; and/or
50 percent or more independent verification measurements completed by the Engineer exceed the tolerance of plus or minus 0.02 feet over 1,000 continuous linear feet of the milling operation, where the Engineer collects independent verification measurements at a linear increment of 100 feet or less.

References: Special Provision (2232) Mill Pavement Surface – Automated Machine Guidance Milling Using Robotic Total Stations, Advanced Materials and Technology Unit, Uses of Intelligent Construction Technology (ICT) Guide