AASHTO R 43:2013 Standard Practice for Quantifying Roughness of Pavements

AASHTO R 43:2013 Standard Practice for Quantifying Roughness of Pavements.
AASHTO R 43 practice describes a method for estimating roughness for a pavement section. An international Roughness index (iRl) statistic is calculated from a single longitudinal profile measured with a road profiler in both the inside and outside wheel paths of the pavement. The average of these two IRI statistics (Mean Roughness Index, MRI) is reported as the roughness of the pavement section.
This standard practice recognizes the need for a quality assurance (QA) plan and proposes guidelines for the development of a QA plan.
Measurements of profile are made in accordance with ASTM F. 950. If any part of’ this standard practice is in cont’lict with its referenced documents, such as ASTM standards or other AASHTO standards, this standard practice takes precedence fbr its purpose.
3.1.1. roughness—according to ASTM E 867, the deviation of a surface from a true planar surface with characteristic dimensions that affect vehicle dynamics and ride quality. In this standard practice. the term “roughness” is the average of two IRI statistics (MRI) calculated from longitudinal profile measurements, one in each pavement wheel path.
3.1.2. longitudinal profile—a nvo-dimensional slice of the roadway surface taken along the travel direction, such as along the wheel path. It represents the perpendicular deviations of the pavement surface from an established reference plane parallel to the horizontal.
3.1 .3. International Roughness Index (IRI)—a statistic used to estimate the amount of roughness in a measured longitudinal profile. The IRI is computed from a single longitudinal profile using a quarter-car simulation as described in the paper “On the Calculation of IRI from Longitudinal Road Profile” (Sayers 1995). A computer program to calculate the IRI statistic from a longitudinal profile is included in ASTM E 1926.
SIGNIFICANCE AND USE
This standard practice outlines standard procedures for measuring longitudinal profile and calculating the IRI for highway pavement surfaces to help produce consistent estimations of IRI for network-level pavement management.
QUALITY ASSURANCE
Agencies using this standard practice are required to develop a satisfactory quality assurance (QA) plan. At a minimum, the plan shall include the requirements listed in the following sections:
5.1.1. Qualification and training records of individuals conducting the survey;
5.1.2. Accuracy, repeatability, and calibration records of equipment used in the survey: and
5.1.3. Periodic and ongoing quality control program and the content of the program.
Note I -The estimate of roughness of pavements can be used both at network- and project-level pavement management. Guidelines for network level are included in ASTM E 1166, which can be used as a source for the development of a QA plan.
Note 2 The guidelines that can be used for the development of a quality assurance plan are given in Appendix X2.AASHTO R 43 pdf download.