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The National Academies

NCHRP 10-106 [Active]

Update of AASHTO Standard Practice for Certification of Inertial Profiling Systems (R 56)

  Project Data
Funds: 249,984
Staff Responsibility: Amir N. Hanna
Research Agency: Wood Environment & Infrastructure Solutions, Inc.
Principal Investigator: Amy Simpson
Effective Date: 8/3/2020
Completion Date: 2/2/2022

BACKGROUND: Inertial profilers are used by state highway agencies and others to produce a relatively accurate and repeatable measurement of the pavement profile, which can then be analyzed to produce various smoothness statistics (e.g., International Roughness Index—IRI).  AASHTO R 56, Standard Practice for Certification of Inertial Profiling Systems, describes a certification procedure for operators and test equipment used to measure a longitudinal surface elevation profile of a roadway based on an inertial reference system that is mounted on a data collection vehicle.  The practice stipulates minimum requirements intended to address the need for accurate and repeatable profile measurements for construction quality control/quality assurance, acceptance, and network-level data collection.  However, there is a concern that this practice does not adequately address the range of potential applications (e.g., project-level versus network-level data collection and low and high pavement roughness).  Research is needed to identify the shortcomings of R 56, pursue needed work to identify rational modifications, and develop an updated version of R 56 for consideration and adoption by AASHTO.  

 

OBJECTIVE: The objective of this research is to develop an updated version of AASHTO R 56, Standard Practice for Certification of Inertial Profiling Systems, for consideration and adoption by AASHTO.

 

Accomplishment of the project objective will require at least the following tasks.

  

PHASE I: (1) Collect and review relevant domestic and foreign literature, research findings, and information relative to the development of R 56 and profile measurement.  This information may be obtained from published and unpublished reports and contacts with public and private organizations involved in roadway surface profile measurements. (2) Critically review R 56 and identify its strengths and weaknesses, as well as gaps requiring consideration. (3) Based on the review performed in Tasks 1 and 2, identify the items recommended for further consideration/investigation in Phase II to improve R 56. (4) Based on the evaluations performed in Tasks 2 and 3, prepare an updated, detailed work plan for Phase II that includes an approach for developing an updated version of R 56 for consideration and adoption by AASHTO. (5) Prepare an interim report that documents the research performed in Tasks 1 through 4. Following review of the interim report by the NCHRP, the research team will be required to make a presentation to the project panel. Work on Phase II of the project will not begin until the interim report is approved and the Phase II work plan is authorized by the NCHRP. The decision on proceeding with Phase II will be based on the contractor’s documented justification of the updated work plan.

  

PHASE II: (6) Execute the Phase II plan approved in Task 5, and identify the recommended changes to R 56.  Prepare and submit a technical memorandum listing the recommended changes for NCHRP review and approval before proceeding with Task 7. (7) Prepare an updated version of R 56 in AASHTO format. (8) Prepare a final deliverable that documents the entire research effort.  The recommended updated version of R 56 shall be prepared as a stand-alone document.

 

STATUS: Research in progress.

 

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