SECTION 514—DIAMOND GRINDING OF CONCRETE PAVEMENT
514.1 DESCRIPTION—This work is the diamond grinding of existing cement concrete surfaces as indicated or directed.
514.3 CONSTRUCTION—
(a) Equipment. Use a power driven, self-propelled machine having diamond blades and capable of grinding the surface of the pavement to the specified smoothness tolerances and texture. Do not use equipment that causes spalls at joints or cracks, or fractures the aggregate at the surface.
(b) Grinding. Grind the entire pavement surface in the longitudinal direction beginning and ending at lines normal to the pavement centerline, unless otherwise specified. Grind in either direction unless it is otherwise determined by the Representative that traffic safety considerations mandate grinding with traffic flow. Provide a uniform finished surface and eliminate joint or crack faults. Operate the grinding machine parallel to centerline. Texture the entire pavement surface; however, do not perform extra depth grinding to eliminate minor depressions. Do not exceed 2 inches of overlap. Do not grind within 2 feet of existing curb, bridge barrier, and roadway barrier. Newly sealed longitudinal or transverse joints that are damaged due to the diamond grinding operation will be resealed as specified in Section 512 and Section 521 at no additional cost to the Department. A newly sealed joint will be defined as a joint sealed under the current contract.
Remove slurry or residue resulting from the diamond grinding in a continuous operation. Do not allow grinding slurry to flow across lanes occupied by traffic or to flow into gutters or other drainage facilities. Satisfactorily clean the pavement surface after diamond grinding and prior to opening to traffic. Do not waste slurry within the Department’s Right-of-Way. Dispose of all slurry as specified in Section 105.14514.3 (f)unless approved by the Departments Representative..
(c) Texture. Provide a surface texture consisting of parallel grooves between 0.09 inch and 0.13 inch wide with a “land area” between grooves of 0.060 inch to 0.110 inch and a difference between the peaks of the ridges and the bottom of the grooves of approximately 1/16 inch.
(d) Tolerance.
1. Transverse Tolerance. Restore original pavement cross slope. Maintain a uniform cross slope. Check the uniformity of cross slope at 100-foot intervals longitudinally.
Correct any areas with deviations greater than 1/4 inch in 12 feet. Provide a positive cross slope such that the pavement drains.
Provide the Representative with documentation recording each cross slope test location and the maximum depth of depression or slope misalignment at that location.
2. Longitudinal Tolerance. Supply and operate equipment as specified in Section 507.3(a), for all longitudinal roughness tests. Test the pavement surface roughness in the longitudinal direction and submit the record of the information to the Inspector-in-Charge before beginning any diamond grinding work. Following grinding of the pavement surface, test the longitudinal roughness as specified in Section 507.3(c)1.
Regrind pavement segments as specified in Section 507.3(d). The cost of ride testing shall be considered incidental.
(e) Concrete Pavement Rehabilitation. Concrete pavement repairs including concrete pavement patching, concrete spall repair, dowel retrofit, slab stabilization, and slab jacking must be completed before the start of any diamond grinding operations.
After completing the concrete rehabilitation operation, determine the ride quality of the existing pavement in accordance with Section 507.3(a) and Section 507.3(b), before performing any diamond grinding. After completing the diamond grinding operations, reevaluate the ride quality of the pavement surface according to Section 507.3(a) and Section 507.3(b). Use the same pavement surface profile measuring equipment to perform all ride quality evaluations on the project.
After diamond grinding the pavement surface, provide a maximum IRI of 70 in/mile for facilities where posted speed limits are greater than 45 miles per hour, and a maximum IRI of 90 in/mile for facilities where posted speed limits are less than or equal to 45 miles per hour. Meet these requirements in all IRI lots where diamond grinding of the pavement was performed to receive payment.
1. Lots. A full lot is 528 feet of a single lane. The Representative will designate lots starting at the beginning ride quality limit and continuing to the ending ride quality limit for each pavement lane and ramp that is 12 feet or wider. Do not include the length of excluded areas in the 528 feet. Excluded areas will consist of; bridge decks, ramps less than 1,500 feet,in length, tapered pavements less than 12 feet wide, partial lots less than 100 feet in length, shoulders, medians, and other pavement surfaces as indicated.
(f) Slurry Management Plan. The contractor is responsible for the development of a Slurry Management Plan. Within fourteen (14) days after the actual notice to proceed, the Contractor shall submit their proposed Slurry Management Plan for approval to the Department of Environmental Protection (DEP) or the County Conservation District (CCD) should the CCD have delegated authority from DEP. Grinding operations shall not begin without an approved plan and discharges of untreated slurry to the environment are not permitted. The Slurry Management Plan shall include the following at a minimum:
1. General Summary. Provide a general summary outlining the project scope including means and methods for slurry management, a site map for the project, and a list of permits required for Slurry Management Plan (e.g., NPDES, Beneficial Use Permit, Erosion and Sedimentation Control Plan approval, etc.)
2. Slurry Volume. Provide an estimate of the expected volume of slurry that will be generated from the project.
3. Slurry Hauling. Describe the method to collect and transport slurry in water-tight haul units to prevent spills.
4. Water Management. Describe management of the water. Examples include: Allowing the water to evaporate, re-using the water in the grinding operation, disposing of the water via sanitary sewer (provide proper permits), hauling the water to a treatment facility (provide the name of the treating facility), or other commercially useful application.
5. Solids Management. Describe management of the precipitated solids. Examples include: Evaporation basins, using solids as a component in recycled aggregate or other commercially useful application. Evaporation basins must meet requirements specified in 105.14 and 514.3(f)8.
6. Stop Work Plan. Stop Work Plan must define conditions that will require work stoppage. At a minimum, stop operations and perform the necessary corrective actions before proceeding if any of the following conditions occur. Notify the Department immediately if condition 7.f or 7.g occurs.
6.aRaining during operations resulting in discharge of slurry into buffer areas,
6.bEquipment failing to contain or remove slurry,
6.cDefined quality control requirements are not followed,
6.dThe slurry is discharged into areas not approved in the Slurry Management Plan,
6.eThe slurry discharges into waters of the commonwealth, or
6.fA spill.
7. Evaporation Basin. When an evaporation basin is proposed, provide design detail for evaporation basin including the following:
7.aOwnership and location of the temporary or permanent containment basin(s), including any required permitting.
7.bIndicate whether basins will be temporary or permanent.
7.cNumber of basins proposed.
7.dBasin sizing including oversizing to account for rainwater.
7.eMethod used to line the evaporation basin including material type and thickness.
7.fPlan showing all dimensions of basin and distances to environmentally sensitive areas such as Waters of the Commonwealth, including jurisdictional wetlands
7.gDescribe restoration of the evaporation basin area. Include fill material, topsoil, seed mixtures, temporary covers, and schedule for restoration at a minimum.
514.4 MEASUREMENT AND PAYMENT—Square Yard
Price includes the removal and disposal of all slurry.
No ride quality incentive will be paid for diamond grinding on concrete pavement rehabilitation projects.