AASHTO R 54-2014 Standard Practice for Accepting Pavement Ride Quality When Measured Using Inertial Profiling Systems.pdf
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1、Standard Practice for Accepting Pavement Ride Quality When Measured Using Inertial Profiling Systems AASHTO Designation: R 54-141American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS 5a R 54-1 AASHTO Standard Practice fo
2、r Accepting Pavement Ride Quality When Measured Using Inertial Profiling Systems AASHTO Designation: R 54-1411. SCOPE 1.1. This practice provides guidance and example specification language intended for use by Owner-Agencies in the development of specific contract language when requiring the measure
3、ment and evaluation of ride quality and compliance using inertial profiling systems (IPS) and the International Roughness Index (IRI) as the quality measure. 1.2. If any part of this practice is in conflict with references made, such as ASTM or AASHTO Standards, this practice takes precedence for it
4、s purposes. 1.3. The values stated are in U.S. Customary units and are to be regarded as the standard. 1.4. This specification does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this specification to establish appropriate
5、safety and health practices and determine the applicability of regulatory limitations related to and prior to its use. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 328, Inertial Profiler R 56, Certification of Inertial Profiling Systems R 57, Operating Inertial Profiling Systems 2.2. ASTM Standa
6、rds: E867, Standard Terminology Relating to Vehicle-Pavement Systems E1926, Standard Practice for Computing International Roughness Index of Roads from Longitudinal Profile Measurements 2.3. Other Document: Sayers, M. W. “On the Calculation of International Roughness Index from Longitudinal Road Pro
7、file.” Transportation Research Record 1501. Transportation Research Board, National Research Council, Washington, DC, 1995, pp. 112. 3. TERMINOLOGY 3.1. Definitions: 3.1.1. Inertial Profiling System (IPS)an inertial profiler that meets the requirements of M 328 when combined with an operator. 2016 b
8、y the American Association of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS 5a R 54-2 AASHTO 3.1.2. International Roughness Index (IRI)a statistic used to determine the amount of roughness in a measured longitudinal profile. The IRI
9、is computed from a single longitudinal profile using a quarter-car simulation at 50 mph (Sayers 1995). Computer programs to calculate the IRI from a longitudinal profile are referenced in ASTM E1926. 3.1.3. line lasera line laser obtains a series of data points along a line, which is typically perpe
10、ndicular to the travel direction, with the line typically being 4 in. long. A single, bridged elevation value is computed from this data. 3.1.4. localized roughnessany 25-ft segment of roadway that contributes disproportionately to the overall roughness index value. Areas of localized roughness are
11、identified using a report of continuous IRI with a base length of 25 ft. This yields the IRI of every possible 25-ft segment. Any segment for which the continuous report exceeds a threshold IRI value is considered a defective segment requiring correction. Note 1The threshold IRI value in inches per
12、mile should be determined by each Owner-Agency. A typical range of values for various highway types is shown in Table 1. Table 1Typical Threshold Values for Localized Roughness Roadway Type IRI (in./mile) Interstate 140 to 160 State primary 150 to 170 State secondary 160 to 190 3.1.5. longitudinal p
13、rofilethe vertical deviations of the pavement surface taken along a line in the direction of travel referenced to a horizontal datum. 3.1.6. report intervalthe longitudinal distance between the outputs of a profile index value. 3.1.7. roughness according to ASTM E867, the deviation of a surface from
14、 a true planar surface with characteristic dimensions that affects vehicle dynamics, ride quality, dynamic loads, and drainage. 3.1.8. Type A Roughness Measurementa test procedure to measure the longitudinal profile of a surface using an inertial profiler and to compute the profile index known as th
15、e International Roughness Index (IRI). 3.1.9. Type B Roughness Measurementa test procedure to measure surface profile deviations using a straightedge. 4. SIGNIFICANCE AND USE 4.1. This example provides specification language for measuring and accepting ride quality on newly constructed paving projec
16、ts using an IPS and the IRI quality measure. If an Owner-Agency elects to use some other ride quality index, the fundamental methodology described herein remains valid, but not the individual settings. Note 2The IPS should be verified on the same pavement surface type and texture as that being measu
17、red. When profiling pavements with rough macrotexture, a height sensor with a large footprint is needed. A line laser that utilizes a bridging algorithm is an example of a sensor with a large footprint. The consequence of not using a large footprint sensor may be an upward bias in the IRI as measure
18、d by an IPS with a single-point (dot) laser. An IPS with a single-point laser can also collect inaccurate data on longitudinally tined, longitudinally grooved, or diamond ground pavements. A line laser that utilizes a bridging algorithm is recommended for such pavements. 2016 by the American Associa
19、tion of State Highway and Transportation Officials. All rights reserved. Duplication is a violation of applicable law.TS 5a R 54-3 AASHTO 5. EQUIPMENT AND OPERATOR 5.1. Provide an approved 10-ft straightedge. 5.2. Provide an inertial profiler meeting all requirements and specifications found in M 32
20、8 and currently certified in accordance with R 56. Operate the equipment in accordance with R 57. 5.3. Provide the Owner-Agency a copy of the equipment certification. Display a current decal on the equipment indicating the expiration date of certification. Note 3An equipment certification or decal w
21、ould be required only if the Owner-Agency had a certification program that issued them, or where it recognizes another agencys certification program in which certifications, decals, or both are issued. 5.4. Provide a qualified profiler operator. Provide the Owner-Agency a copy of the operators quali
22、fications or current certification. 6. WORK METHODS 6.1. Quality Control (QC) Testing (nondirected)Perform QC tests on a daily basis throughout the duration of the project. Use an approved straightedge, inertial profiler, profilograph, or any other appropriate means. 6.2. Quality Control Testing (di
23、rected)Use Type A Roughness Measurement. Use Type B Roughness Measurement only when Type A Roughness Measurement cannot be used or when specified by the Owner-Agency. Measure the finished surface of the completed project or at the completion of a major stage of construction as approved by the Owner-
24、Agency. Coordinate with and receive authorization from the Owner-Agency before starting testing. Obtain roughness measurements within 7 days after receiving authorization and submit results to the Owner-Agency within 24 h of data collection. 6.2.1. Operate the profiler in accordance with R 57 and pr
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