00622.41 687 Section 00622 - Grinding Concrete Pavement Description
00622.00 Scope - This Work consists of grinding existi ng portland cement concrete Pavement .
Equipment
00622.20 Grinding Equipment - Provide self -propelled grinding Equipment that:
• Has diamond embedded grinding blades that will produce a smooth textured surface. • Is able to grind a strip at least 4 feet wide. • Can remove slurry and residue during the grinding operation.
00622.21 Smoothness Testing Equipment :
a.Straightedge - Provide one 12-foot straightedge.
b.Profilograph - Provide a California-type profilograph that: • Can determine the profile index of the Pavement according to ODOT TM 770. • Is either computerized or not computerized. • Is equipped with a recording device. • Is calibrated, in good working condition, and ready for operation before concrete Pavement grinding begins.
c.Profi lometer - Provide a profilometer that: • Is capable of generating the equivalent California-type profilograph plot and values according to ODOT TM 770. • Employs an accelerometer established inertial profiling reference and a laser height sensing instrument t o produce a true profile of the Pavement surface. • Is capable of reporting elevations with a resolution of 0.004 inch or finer at an interval of 6 inches or less. • Is able to generate the locations and heights of all bumps and dips. • Is calibrated, in good working condition, and ready for operation before performing smoothness measurements. Before beginning smoothness measurements, have the profilograph or profilometer operators meet with the Engineer at a mutually agreed upon time to discuss all aspects of smoothness measurements on the Project. Labor
00622.30 Smoothness Testing Operators - Provide operators for the profilograph and the
profilometer that are experienced in the operation of the Equipment . Construction
00622.41 Grinding - Taper grind to match the elevation of bridge decks, bridge approach slabs, and
at the ends of the grind area. 00622.42 688 Provide positive lateral drainage by maintaining a constant cross slope between grinding extremities in each lane. Grind transition, auxiliary or ramp lane from the mainline edge as shown. Schedule and proceed with the grinding operation that will produce a uniform finished surface. Grind the Pavement in a longitudinal direction beginning and ending at lines normal to the Pavement centerline. Do not grind Roadway Shoulder s unless shown. Do not encroach on traffic movement outside the work area. Do not damage underlying surfaces, cause fractures, or spall joints. Perform grinding within one of the following Aggregate hardness tolerances: Aggregate Hardness Tolerance Moderately Hard Aggregate Hard Aggregate Abrasion (AASHTO T96) > 20.0 ≤ 20.0 Blade segment thickness 0.100" to 0.125" 0.100" to 0.125" Land area between grooves* 0.100" to 0.135" 0.080" to 0.110" Texture depth** Target of 1/16" with averages between 1/32" to 3/32" * Based on an average of a minimum of 10 measurements across the ground width for one Pass. ** Based on an average of a minimum of 6 measurements across the ground width for one Pass. The Project's Aggregate hardness tolerance will be listed in the Special Provisions.
00622.42 Removal and Disposal of Material - Remove all grinding materials as the grinding
operation is performed. Dispose of all materials according to 00290.20.
00622.43 Surface Finish - Provide a Pavement surface that:
• Meets the Aggregate hardness tolerances of 00622.41. • Is true to grade. • Has a longitudinal line-type texture with corrugations parallel to the outside Pavement edge which present a narrow ridge corduroy type appearance. • Has at least 95 percent of the Pavement surface textured. When approved, depressed Pavement areas and other localized depressed areas will not require texturing. Extra depth grinding is not required where minor depressions are detected in the existing Pavement . Provide at least a 2.0 inch longitudinal overlap when producing multiple Passes but keep overlaps over 2.0 inches to a minimum. Maintenance
00622.60 Correction of Defects - Correct the following deficiencies at no additional cost to the
Agency: • Pavement corrugation due to "out -of-round" wheels on grinding Equipment . • Improper cutting head operations that cause the head to ride in and out of the Pavement when encountering light and heavy cuts. • Depressions created from improper starting and stopping during the cutting operation. • Unground ridges left in the Pavement from defective blades in the grinding head. 00622.70 Regrind the entire lane width in areas that require corrective work. Finishing and Cleaning Up
00622.70 Pavement Smoothness - Perform smoothness testing under the observation of the
Engineer. If the Contractor performs smoothness measurements on a Day other than the Day Pavement grinding is performed, all additional traffic control required for the smoothness testing, but not required for other Work , will be at no additional cost to the Agency.
a.Straightedge Testing and Tolerance - Test the surface with a 12 -foot straightedge perpendicular to the centerline. The Pavement surface shall not vary by more than 1/4 inch. Straightedge testing is not required across longitudinal joints or outside the ground area.
b.Graphic Profile Testing and Tolerance :
1.General - Test the longitudinal surface of textured surfaces for smoothness by the graphic profile testing (GPT) met hod according to ODOT TM 770. Before beginning grinding on the Project, demonstrate the profilograph and profilometer operation by conducting a calibration test according to ODOT TM 770, and running the machine twice over a 0.1 mile section of Pavement with repeating results. The Pavement shall have a profile index of 7.0 inches per mile or less for each wheel path in each 0.1 mile segment or partial segment, and shall have no individual deviation of 0.3 inch or more.
2.Surface Test - Provide a complete graphic profile by running the profilograph or profilometer over the full length of the lanes ground and 50 feet beyond the ends. Provide a profile in each vehicle wheel path by running profiles on the Pavement surface along lines parallel to and appro ximately 3 feet from each edge of the Pavement and 3 feet from each side of longitudinal joints.
3.Determining Profile Index :
a.General - Determine the profile index of Pavement in 0.1 mile segments and partial segments. A segment will end and will be considered a partial segment and a new segment will begin when the segment sequence is interrupted by stage construction or by profiled areas excluded from the GPT smoothness requi rements. The following profiled areas of Pavement are excluded from the GPT smoothness requirements: • Profiles extending beyond the Project ends • Bridge decks and bridge panels • First and last 13 feet at the Project ends and bridge approach slabs • Pavement on horizontal curves with radii less than 1,000 feet Include and analyze separately those areas in the profile charts that are not subject to the GPT smoothness profile index requirements.
b.Method of Analysis - Determine the profile index and individual deviations of 0.3 inch or more by analyzing the profile charts according to ODOT TM 770. Provide the profile charts and results to the Engineer. 00622.80 690 (c) Failure To Meet Graphic Profile Requirements - Correct all segments or partial segments that exceed the requirements of 00622.70(b) in either wheel path by regrinding to the specified limits except correct deviations of 0.3 inch or more at least to the edge of the blanking band. The Engineer will determine and mark the areas to be profiled. Retest all segments requiring corrective work for the entire length according to 00622.70(b) under the observation of the Engineer. All corrective w ork and graphic profiling, including traf fic control, will be at no additional cost to the Agency. Measurement
00622.80 Measurement - The quantities of concrete Pavement grinding will be measured on the
area basis. Payment
00622.90 Payment - The accepted quantities of concrete Pavement grinding will be paid for at the
Contract unit price per square yard for the item "Grind Concrete Pavement". Payment will be payment in full for furnishing all Equipment , labor, and Incidental s necessary to complete the Work as specified.
Grinding Concrete Pavement in other states
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 753–756 of 1,268. View official source ↗