Inertial Profiler Certification for Evaluation of International Roughness Index (2018) / Chapter Skim
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Pages 49-52
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From page 49... ...
49 This chapter indicates the states that use IRI as the smoothness index for construction acceptance and the policy the states use to specify the IRI for construction acceptance, based on the information that was obtained from the 44 states that responded to the survey. Smoothness Specification A smoothness specification indicates the level of smoothness that is required on the final paved surface of a pavement.
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From page 50... ...
50 Inertial Profiler Certification for Evaluation of International Roughness Index Out of the six states that do not use IRI or HRI-based smoothness specifications, four states use a PI-based smoothness specification for AC, as well as PCC pavements; one state uses a PI-based smoothness specification for PCC pavements and a Ride Number–based smoothness specification for AC pavements; and one state -- where there are no PCC pavements in the highway network -- uses a smoothness specification based on the Ride Number for AC pavements. Figure 12 shows the number of state DOTs that responded to the survey and that use an IRIbased smoothness specification categorized according to the following: • Used only on AC pavements, • Used only on AC pavements and PCC pavements, • Used only on AC pavements and bridge decks, and • Used on AC pavements, PCC pavements, and bridge decks.
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From page 51... ...
Use of IRI for Construction Acceptance 51 extend the IRI-based smoothness specification to PCC pavements after it is implemented for AC pavements. Illinois DOT, which does not use an IRI-based smoothness specification, indicated that it has stipulated IRI-based specifications on pilot projects to introduce such specifications to contractors.
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From page 52... ...
52 Inertial Profiler Certification for Evaluation of International Roughness Index on a project. The four state DOTs that indicated that they use a different policy provided the following responses: • The assignment of the smoothness specification to a project is decided during the design phase.
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