SECTION 454 – DIAMOND GRINDING EXISTING CONCRETE PAVEMENT
454.01 Description
This Section describes the requirements for diamond grinding of existing concrete pavements.
454.02 Materials
454.02.01 Materials
(Intentionally Blank)
454.02.02 Equipment
Provide equipment as specified: Grinding Machine ................................ ................................ ................................ ................................ ....... 1006.08 Mechanical Sweeper ................................ ................................ ................................ ................................ ... 1008.03
454.03 Construction
454.03.01 Diamond Grinding Existing Concrete Pavement
Ensure that concrete pavement repairs are performed before diamond grinding. Perform joint sealing after diamond grinding. Perform grinding operations in a longitudinal direction that is parallel to the longitudinal joint. Do not overlap longitudinal passes more than 2 inches. Continuously remove grinding slurry from the pavement surface. Ensure that the surface of the ground pavement has a corduroy texture consisting of grooves between 1/16 and 1/8 of an inch in width. Ensure that the peaks of the ridges are between 1/32 and 1/8 of an inch in width and are approximately 1/16 of an inch higher than the bottoms of the grooves. Do not grind to eliminate minor depressions if it lowers the overall profile of the pavement. Ensure that in any 3 × 100 foot test area at least 95 percent of the surface is ground and textured. Test transverse joints and cracks to ensure that adjacent surfaces are in the same plane. Regrind misaligned joints and cracks in excess of 1/16 inch until the surfaces are flush. Using a mechanical sweeper, clean the area before opening to traffic and before subsequent construction or resurfacing. Remove and dispose of slurry and sweepings as specified in 201.03.01.H.
454.03.02 Ride Quality Requirements
Ensure that the surface, after grinding, meets ride quality requirements. The Department will evaluate the ride qual ity of the diamond grinding on the project using the International Roughness Index (IRI) according to ASTM E 1926. The diamond grinding will be evaluated using the target IRI (T) determined from Table 454.03.02-2. The Department will evaluate the ride quality of the final riding surface of the mainline travel lanes. The Department will use the measured IRI to calculate the pay adjustment (PA) using pay adjustment equation (PAE) type PA1 as specified in Table 454.03.02-1. PA will be based on lots of 0.01 mile length. The PA will be positive for superior quality work or negative for inferior quality work. For diamond grinding on ramps and shoulders, the RE will visually inspect the final riding surface. Based on visual inspection, if the RE determines that the work may not conform to the ride quality requirements, then the Department will evaluate the ride quality of the final riding surface using IRI. Visual inspection by the RE is considered sufficient grounds for such evaluation. The Department will use the measured IRI to calculate the pay adjustment using pay equation type PA2 as specified in Table 454.03.02-1.
1.Smoothness Measurement. The Department will test the longitudinal profile of the final riding surface for ride quality with a Class 1 Inertial Profiling System according to NJDOT R-1. If project conditions preclude the use of the Class 1 Inertial Profiling System, the Department will use a Class 1 Walking Profiler or Lightweight Profiler.
2.Quality Control Testing. Perform quality control testing during lift placement to ensure compliance with the ride quality requirements specified in Table 454.03.02-2.
3.Preparation for IRI Testing. Notify the RE when all diamond grinding is complete and the RE will request IRI testing by Pavement & Drainage Management & Technology (PDMT) unit. Provide traffic control when the Department performs IRI testing. Perform mechanical sweeping of the surface before IRI testing. To facilitate auto triggering on laser profilers, place a single line of temporary pavement marking tape perpendicular to the roadway baseline at the beginning and end of each lane, shoulder, and ramp to be tested or at the direction of the Department. Submit the actual stationing for each temporary pavement marking tape location to the RE.
4.Quality Acceptance. The Department will determine acceptance and provide PA based on the following:
a.Pay Adjustment. The acceptable IRI f or the roadway pavement will be the target IRI (T) from Table 454.03.02-2 for which full payment will be made and will be determined using the latest available existing current average IRI (C) data of the right most travel lane specified in 102.04 or from PDMT. The number of lots for final pay adjustment will be reduced by the number of lots excluded for each segment shown in Table 454.03.02-1. Lots excluded from final PA will be those with the highest recorded IRI numbers for respective roadway and bridge deck segments. A single average IRI value and the corresponding PA for each 0.01 mile lot will be reported. IRI units are in inches per mile. Table 454.03.02-1 Pay Equations for Ride Quality Pay Equation Type Excluded Lots Pay Equation(s) PA1 As shown in the Special Provisions Table 454.03.02-1A IRI < (T – 25) PA1 = $10 (T – 25) ≤ IRI < (T – 5) PA1 = $ (T – IRI – 5) x 0.50 (T – 5) ≤ IRI ≤ (T + 5) PA1 = 0 (T + 5) < IRI ≤ (T + 75) PA1 = –$(IRI – T – 5) x 1.4286 IRI > (T + 75) PA = –$100 PA2 Will include, if tested IRI ≤ 120 PA2 = $0 120 < IRI ≤ 170 PA2 = (IRI − 120) x (−$10.00) IRI > 170 Maximum Negative Pay or Corrective Action Table 454.03.02-2 Target IRI for Diamond Grinding Roadway Type Target IRI (T) Freeways or Limited Access Highway 0.45C1 or 50 whichever is higher Other than Freeways or Limited Access Highways with speed limit ≥ 35 MPH 0.50C1 or 60 whichever is higher Other than Freeways or Limited Access Highways with speed limit < 35 MPH 0.60C1 or 70 whichever is higher
1.Current average IRI (C) is the average of the latest available preconstruction network level IRI data of right most travel lane from PDMT.
b.Corrective Action. If the average IRI is greater than T+75 inches per mile after testing is performed, the Department may require corrective action or assess the maximum negative pay adjustment as computed in Table 454.03.02-1. If the Department requires corrective action, submit a plan for corrective action. If the plan for corrective action is approved and the lot is corrected, the Department will retest and evaluate the corrected area as a new lot that must meet the same requirements as the initial work. If the plan fo r corrective action is not approved, the Department may require removal and replacement. The replacement work is subject to the same requirements as the initial work. When regrinding to correct deficiencies is required, regrind the entire width of the lan e in the area to be corrected.
Referenced in this section
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 241–242 of 651. View official source ↗