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Measure the roughness of the final surface of Asphalt Mix (SAM) or Portland Cement Concrete (PCC) pavements using an International Roughness Index (IRI) Inertial Profiler to collect Quality Control (QC) data. The IRI Inertial Profiler shall conform to E950 and MSMT 563. The Administration will use an IRI Inertial Profiler to perform all Quality Assurance (QA) testing and acceptance. Measure all traveled roadway surfaces unless otherwise indicated.
Not applicable.
535.03.01 Equipment Standardization. MSMT 563. Perform standardization on Administration specified sites at regular intervals.
(a) Re-standardization may be required for equipment that may be out of conformance between regular intervals.
(b) Submit a copy of the completed standardization results to the Administration’s Office of Materials Technology (OMT) immediately upon completion of the standardization.
(c) QC test data obtained with a profiler that has not been standardized will not be accepted.
535.03.02 Quality Control Testing for Pavement Profile. E950 and MSMT 563.
(a) Measure the pavement profiles in the direction of travel in both wheel paths simultaneously and parallel to the right edge of the lane.
(b) Document a regular schedule of pavement profiling in the Asphalt Pavement Field Quality Control Plan as specified in 504.03 or the Portland Cement Concrete Proposed Paving Plan as specified in 520.03.
(c) Notify the Engineer prior to performing any QC measurements. Submit the results according to the approved QC plan within 72 hours of completion of the paving operations.
535.03.02.01 Data Submittal. Submit all data to the Engineer and OMT (in electronic format) via one of the following:
(a) E-mail: ridespec@mdot.maryland.gov
(b) Delivered:
Office of Materials Technology
7450 Traffic Drive
Hanover, MD 21076
Attention: Paving Quality Assurance Team Leader
535.03.02.02 Profile Measurements. QC profile measurements and data submission that have not been completed for all project sections as specified will not be eligible for incentive payment or for defect exemptions. QC data is required for materials clearance.
535.03.02.03 Quality Control
(a) Measure and report the QC IRI in sections equal to 25 ft in length and one lane in width. Sections measured that are shorter than 25 ft due to exempt areas or the project end are required to be reported but not used in the pay calculation.
(b) Measure a full 25 ft section after each exempt area.
(c) Perform three measurement runs according to MSMT 563. The coefficient of variation of the overall average IRIs shall be less than or equal to 2 percent for three runs.
(d) When the first three runs do not meet the above criteria, perform additional runs until three measured runs meet the criteria. Submit the acceptable three runs to the Administration. Only the median run (based on average IRI) will be considered for the QC IRI data and will be used to compute any pay adjustments.
535.03.02.04 Exempt Areas. The following pavement areas are exempt from profiling and reporting for pay adjustment:
(a) Shoulder areas.
(b) Parking areas of ride sharing facilities or park and ride lots.
(c) Pavements of ramps, side street tie-ins, acceleration lanes, or deceleration lanes less than 1000 ft in length.
(d) Bridge decks, railroad crossings, stop signs, and pavement within 50 ft thereof.
(e) Pavement within 50 ft of transverse joints that separate it from existing pavement. This does not apply when a transverse joint is paved on both sides as part of one contract.
(f) Pavements on projects with less than 1000 center lane ft, after elimination of areas not to be profiled under items (a) through (e).
(g) Ramps greater than 1000 centerline ft with radius less than 2000 ft.
Perform Pavement Surface Checks on areas listed above as specified in 504.03.14.
535.03.02.05 Defects. When any section IRI is greater than or equal to IRIe according to Table 535 B, take one of the following corrective actions as directed and at no additional cost.
(a) Remove and replace the pavement that is greater than or equal to IRIe,
(b) Grind the section to bring the section IRI into conformance, or
(c) Accept the Defect Cost for any defective section where corrective action is not performed. The Defect Cost is determined as specified in 535.04.01.
Perform the above corrective actions to each defective section as determined. Approval to waive (a) or (b) does not constitute a waiver of (c) unless explicitly stated.
535. Re-Profiling
(a) Re-profile all affected pavement sections after any corrective work, including any additional transverse paving joints created, to determine if the sections are within specification.
(b) The re-profiled data shall include the section prior to the corrected sections and the four sections after the corrected sections.
(c) The re-profiled data shall be used for final pay calculations; however, the minimum IRI value for any corrected section shall be limited to IRIc.
535.03.02.06 Defects Not Due to Workmanship. When it is determined that a defect is not the result of substandard workmanship, a written justification for removing the defect from final pay calculations will be provided to the District. The matter will be discussed with OMT before the final pay adjustment is determined.
535.03.03 Paving Quality Assurance Testing for Pavement Profile (IRI). The Administration may measure sections of the pavement to verify the QC data.
(a) The QC data will be used for any pay adjustments on the project if the QA measurements have not been performed within 14 calendar days from the date that the completed QC data was submitted.
(b) Perform QA testing as specified in 535.03. The initial QA test will consist of one run on all 25 ft sections. The initial QA run and the median QC run will be compared to determine QC data acceptance.
(c) The average IRI, the number of defects, and the number of tested sections will be compared as follows:

Average IRI in./mile ± (2% + 2)
Number of Defects Sections ± (10% + 2)
Number of Tested Sections Sections ± (1% + 1)
The QC data will be used for all pay adjustments when it falls within the above tolerances.
535.03.03.01 QA Runs
(a) Perform a minimum of two additional QA runs when the QC data does not agree with the initial QA data and a cause cannot be determined.
(b) The initial and two additional QA runs will then be evaluated to determine if the coefficient of variation of the overall average IRIs is less than or equal to 2 percent for the three runs.
(c) When the three QA runs do not meet the above criteria, additional runs will be performed until three measured QA runs meet the criteria.
(d) The median run (based on average IRI) of the three QA runs will then be re-compared with the QC data in conformance with Table 535 A.
535.03.03.02 Profiler Quality Corrective Actions. If the QC and QA data are still not within the tolerances described in Table 535 A for Average IRI or Number of Defects, retest both profilers according to MSMT 563 to determine their conformance and recalibrate or repair as necessary.
(a) If the QC profiler is not brought into compliance within three paving days, cease paving operation or use another standardized profiler to collect QC data.
(b) Once the QC profiler is brought into compliance, previously tested sections may be retested for comparison with the QA data or the QA data can be accepted as the basis for any pay adjustment on all sections.
(c) If the QA profiler is out of compliance, then the QC data for all sections tested will be accepted.
(d) If both profilers are found to be in noncompliance, repair or recalibrate as necessary and repeat all QC and QA testing since the previous comparison.
When the QC and QA data for Number of Tested Sections are not within tolerance, recalibrate the respective Distance Measuring Instruments (DMIs) and perform additional QC testing until the QC data meets the tolerance criteria.
Pavement surface profile testing costs will be incidental to the SAM surface material or PCC material as specified. Payment will be full compensation for all set up, technicians, traffic control, any type of corrective work to bring the pavement into conformance, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
535.04.01 Pay Limit and Pay Adjustment Determination. The pay limits and pay adjustment will be determined according to MSMT 736 as provided on the MDOT SHA Ride Specification webpage (https://www.roads.maryland.gov/mdotsha/pages/index.aspx?PageId=32) and based on the factors shown in Table 535 B.
TABLE 535 B + The ride specification limits for Pmax, Pmin, IRIa, IRIb, IRIc, IRId, and IRIe will be determined by the Administration according to MSMT 736.
Pmax Maximum Incentive for Overall IRI + Dollars per lane-mile
Pmin Maximum Disincentive for Overall IRI + Dollars per lane-mile
IRIa IRI for Maximum Incentive + Inches per mile
IRIb Minimum IRI for Full Pay + Inches per mile
IRIc Maximum IRI for Full Pay + Inches per mile
IRId IRI for Maximum Disincentive + Inches per mile
IRIe IRI threshold for Defects + Inches per mile