DIAMOND GRINDING CONCRETE PAVEMENT 425.04
425.01 Description
This work consists of grinding portland cement concrete (PCC) pavement to restore drainage and riding characteristics to the pavement surface.
425.02 Materials — Vacant
425.03 Equipment
Provide power -driven, self -propelled grinding equipment designed to smooth and texture PCC pavement with diamond blades. Provide a machine with an effective wheel base of at least 12 ft [3.6 m]. Ensure the front of the machine has a set of pivoting tandem bogey wheels, and the rear wheels travel in the track of the cut pavement. Place the center of the grinding head no more than 3 ft [0.9 m] ahead of the center of the back wheels. Provide equipment that can cut or plane at least 4 ft [1.2 m] wide to avoid a seam in the wheel path of a travel lane. Ensure the machine’s shape and dimension do not encroach on traffic movement outside the work area. Do not use equipment that causes excessive ravels, aggregate fractures, spalls, or cracks, or disturbs transverse and longitu dinal joints.
425.04 Construction Methods
A.Grinding Pavement Grind the surface of pavement areas shown on the Plans. Grind longitudinally, beginning and ending at lines transverse to the pavement centerline. Ensure the ground pavement surfaces of adjac ent sides of transverse joints and cracks are on the same plane. The Department will allow less than 100 percent grinding within specified areas if minor depressions occur in the pavement. Make multiple passes as necessary to achieve acceptable results. Ensure the pavement surface grinding produces a uniform, finished surface. Eliminate joint and crack faults. Maintain a constant cross -slope between the edges of grinding operations to provide positive lateral drainage. Transition the grinding of auxilia ry or ramp lanes from the mainline edge to provide positive drainage and a smooth riding surface. Feather -grind adjacent lanes or paved shoulders to maintain motorist safety and proper drainage for pavement grinding deeper than ¼ in [6 mm].
1.Surface Tex ture and Grooving Grind the pavement surface until it has a uniform appearance, with a texture composed of longitudinal ridges and grooves. Create surface grooves from 0.09 in to 0.15 in [2 mm to 4 mm] wide, spaced up to ⅛ in [3 mm] apart. Ensure the rid ge peaks are at least 1/16 in [1.5 mm] higher than the bottom of the grooves.
425.05 Diamond Grinding Concrete Pavement
2.Slurry Removal Remove and collect grinding slurry or residue by vacuum or other continuous methods. Dispose of the grinding slurry and residue in accordance with applicable laws, rules, and regulations. Do not distribute the slurry evenly on the side -slopes unless the Resident Engineer approves of the disposal method. Ensure that slurry does not enter drainage inlets and watercourses . Prevent the slurry from flowing across lanes used by traffic, or into gutters or other drainage facilities. Conduct a final sweeping before opening the pavement to traffic.
3.Pavement Smoothness
a.Profiling Pavement Surface Profile ground surfaces in accordance with ASTM E 1274. Provide a profilograph with wheels variably spaced. Ensure a pavement with a profile index of 5 in [125 mm] or less per mile using a 0.2 in [5 mm] blanking width. Profile ground surfaces in two passes; one at 3 ft [0.9 m] and one at 9 ft [2.7 m] from the edge of each driving lane. Average the profilograph readings from the two passes to obtain the profile index for each lane. If the profile index exceeds 5 in [125 mm] per mile, grind individual high points in excess of 0.3 in [8 mm] across the entire lane width. Perform additional grinding along lines parallel to the pavement edge to reduce the profile index to the specified values after grinding individual high points. Grind in neat, rectangular sections with uniform surfaces.
b.Straight Edge Tolerance Use a 10 ft [3 m] straightedge to measure surface smoothness. Ensure the maximum distance from the bottom edge of the straightedge does not exceed ⅛ in in 10 ft [3 mm in 3 m]. Perform additional grinding at locations in excess of ⅛ in in 10 ft [3 mm in 3 m]. Ensure that the elevation difference between passes does not exceed ⅛ in [3 mm].
B.Concrete Joints Saw and seal joints in accordance with Section 415, “Concrete Joint Sealing.” after completing diamond grinding.
425.05 Method of Measurement
The Resident Engineer will measure the diamond grinding of PCC pavement by the final approved textured surface area regardless of the number of passes necessary to achieve acceptable results, including minor areas of un -textured pavement withi n this area. If the Resident Engineer determines the need for feathering is not caused by the Contractor, the Resident Engineer may measure the area of feathering as Diamond Grinding Concrete Pavement . PRESSURE GROUTING PAVEMENT 426.03
425.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: DIAMOND GRINDING CONCRETE PAVEMENT Square Yard [Square Meter] The Department will pay for sawing and sealing joints in accordance with Section 415, “Concrete Joint Sealing.” Include the cost of feathering in the contract unit price for Diamond Grinding Concrete Pavement . The Department will not separately measure Diamond Grinding Concrete Pavement for pavement un less otherwise specified. SECTION 426 PRESSURE GROUTING PAVEMENT
426.01 Description
This work consists of pumping a fly ash cement grout under portland cement concrete (PCC) pavement or asphalt pavement to fill the voids beneath the pavement and form a hard, insoluble mass.
426.02 Materials
Provide materials in accordance with Subsection 733.09, “Slurry Grout.”
426.03 Equipment
A.Grouting Equipment
1.Measuring and P roportioning Equipment Provide equipment capable of measuring and proportioning grout components by weight. Use prepackaged materials as approved by the Resident Engineer.
2.Batch Mixing Tank Provide a watertight batch mixing tank with a high speed mix er to blend the materials into a homogenous mixture. Ensure the mixer includes a rotor operating in close proximity to a stator, creating a high shearing action with a mixing speed from 800 rpm to 2,000 rpm. Ensure the mixing pump continuously circulates the materials through the mixer and the mixing tank.
3.Holding Tank Provide a holding tank with a paddle -type agitator placed between the batch mixing tank and the grout pump for continuous operation. Ensure the agitator maintains complete circulation of the grout to keep it in suspension and remove air bubbles from the mix.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 297–298 of 935.