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MnDOT Pavement Surface Smoothness Specification

This document discusses the key components of the Inertial Profiler (IP) Certification and Operator Certification for smoothness evaluation of pavement surfaces. It covers the objectives, procedures, acceptance criteria, and importance of smoothness and Areas of Localized Roughness (ALR) in pavement construction. The document also includes information on the MnROAD Research Facility and provides links to operator training and certification resources.

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MnDOT Pavement Surface Smoothness Specification

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  1. MnDOT Pavement Surface Smoothness Specification 23rd Annual RPUG Meeting September 29, 2011

  2. Key Components of Spec. • Inertial Profiler (IP) Certification • Operator Certification • Smoothness • Areas of Localized Roughness (ALR)

  3. 1. IP Certification MnROAD Research Facility (≈ 40 miles west of Minneapolis/St. Paul)

  4. Neither reliable, nor valid Reliable, but not valid Both reliable and valid ICC SurPRO IP Certification Objectives • To provide a calibration standard against which all inertial profilers can be tested • To verify the reliability and validity of data collected by inertial profilers

  5. IP Certification Procedure • Calibrate IP (check tire pressure, accelerometers, vertical height sensors, DMI, etc.). • Collect six profiles on each test section (one bituminous, one concrete). • Submit hard copies and ERD files of the five “best” runs for each test section.

  6. Bituminous Test Section

  7. IP Certification Acceptance Criteria • The distance of each contractor run must be within 0.2% of the actual length of the test section. • On each test section, the average contractor IRI must be within 5% of the reference IRI. • On each test section, the coefficient of variation of the five contractor IRI values must be no larger than 3%. • On each test section, the average of the five contractor correlations must be at least 90%.

  8. 2011 IP Certification Decal

  9. 2. Operator Certification • All contractors who operate an IP on a MnDOT project must have completed a training course and passed an operator certification exam (70% correct required). • The training and exam are available on the MnDOT Smoothness Program website: http://www.dot.state.mn.us/materials/profilercertification.html

  10. Operator Training Screenshot #1

  11. Operator Training Screenshot #2

  12. Operator Certificate of Training

  13. 3. Smoothness • “Smoothness” is a single IRI value that represents the overall roughness of an entire 528-ft pavement segment. 57.6 in/mi 53.9 in/mi 55.6 in/mi 49.8 in/mi 528 feet 528 feet 528 feet 528 feet • Smoothness is calculated with ProVAL’s “Ride Quality: Fixed Interval” for both the left and right wheel paths.

  14. Pay Adjustment Equations

  15. 4. ALR • “ALR” are 25-ft continuous IRI values that equal or exceed 125.0 inches/mile • ALR is computed for the right wheel path only. • ALR are determined with ProVAL’s “Smoothness Assurance: Short/Long Continuous Histogram.” • ALR monetary deductions depend on the type of paving and posted vehicle speed on a project.

  16. ALR Graph 125 in/mi ALR

  17. ALR Graph

  18. ALR Monetary Deductions

  19. Thank You!

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