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.
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.
426.04 Pressure Grouting Pavement
4.Grout Pump Provide a grout pump with a single action plunger pump with a high -speed backstroke. Provide a pump with precise pressure and capacity control valves, to independently preset maximum pressure and flow. Ensure a pump capacity range from 0 gal/min to 30 gal/min [0 L/min to 110 L/min] and a pressure range from 0 psi to 100 psi [0 kPa to 689 kPa].
5.Discharge Line Provide a discharge line with a positive cut off valve at the nozzle end. Ensure the nozzle remains securely sealed in the cored holes to prevent leaks.
6.Pavement Monitoring Device Provide pavement -monitoring equipment that determines movement, to prevent lifting pavement or overfilling cracks. Use a standard Benkelman Beam, or other equipment approved by the Resident Engineer.
B.Coring Equipment Provide coring equipment capable of cutting 2 in [50 mm] diameter holes through the pavement. Prevent damage to the pavement from excessive down press ure on the core. Use an air compressor and rock drills or other devices capable of drilling the injection holes through the pavement. The Department will not allow air -driven or hydraulic impact drills.
426.04 Construction Methods
A.General Protect the p avement from breaking and cracking. Replace concrete slabs and pavement damaged during pressure grouting operations, at no additional cost to the Department.
B.Weather Limitations Pressure grout when the ambient temperature is at least 35 °F [2 °C] and ri sing. Ensure a pavement temperature of at least 35 °F [2 °C] during pressure grouting.
C.Coring Holes Drill 2 in [50 mm] diameter core holes through the pavement for PCC pavements as indicated. The Resident Engineer may modify the pattern and spacing of the holes. Drill core holes at an angle of 45° towards the bottom of the crack, deep enough to penetrate the cavity for hot mix asphalt pavements. Drill at least two core holes for each 12 ft [3.6 m] wide travel lane, and one hole for every 4 ft [1.2m] o f shoulder width. Drill the core holes from 4 in to 12 in [100 mm to 300 mm] from the crack. Place the holes along one side of the crack or alternate along both sides of the crack. The Resident Engineer may modify the hole pattern and spacing. The Resi dent Engineer will approve the location of the core holes, and determine if additional holes are necessary to fill the cracks. PRESSURE GROUTING PAVEMENT 426.04 Temporarily plug irregular or unsatisfactory holes, or fill them with grout at no additional cost to the Department. Drill core holes and grout in the same day, unless otherwise approved by the Resident Engineer.
D.Clearing Holes Clean the holes of debris to provide a passage for the grout after drilling the core holes to the specified depths, and within 10 min before injecting the grout .
E.Grouting Ensure the flow rate at the pump head does not exceed 7 gal/min [26.5 L/min] while injecting grout. Secure the nozzle of the grout discharge hose in the core hole to provide a seal and maintain the grout pressure. Prevent the nozzle end from extending below the bottom of the concrete for PCC pavement. Continue injecting grout into each core hole until the slab corner lifts from 0.032 in to 0.036 in [0.825 mm to 0.925 mm], or until the pressure at the discharge nozzle exceeds 60 psi [414 kPa]. If no slab lift or no pressure buildup occurs, continue injecting grout until the amount of clear grout flowing up through joints or cracks equals the amount of grout injected. Repeat this procedure in other holes to fill voids. If necessary , temporarily plug adjacent core holes during grout injection operation. Continue injecting grout into the core holes until the cracks are filled for hot mix asphalt pavement. Continue pumping until the amount of clear grout flowing up through joints or c racks equals the amount of grout injected. Repeat this procedure in other holes to fill voids. If necessary, temporarily plug adjacent core holes during grout injection operations. During pumping, watch the pavement monitoring device to prevent excessive lifting of the pavement or rising of the adjacent shoulders. Correct lifted joints as directed by the Resident Engineer. If lifted pavement joints create unsafe conditions for the traveling public, close lanes and make repairs. Complete repairs and joi nt corrections at no additional cost to the Department.
F.Permanently Sealing Holes in Concrete Pavement Remove grout from the core holes and fill the holes with a stiff sand -cement mortar made of one part portland cement to three parts fine aggregate (by volume), or a commercial premixed rapid set mixture, as approved by the Resident Engineer. Repair filled holes that ravel or become damaged at no additional cost to the Department.
G.Regrouting Drill new core holes and regrout slabs as directed by the Re sident Engineer. Drill new core holes and regrout cracks for hot mix asphalt pavement that may require additional filling, as directed by the Resident Engineer. Provide excess grout to hand -finish into cracks to fill the voids as directed by the Resident Engineer.
433.03 Rubblizing Portland Cement Concrete Pavement
H.Clean Up Remove deposits of grout on the pavement or shoulder. Clean the pavement surface before allowing traffic on the completed sections. Remove other debris, bags, and spillage from the right -of-way each day.
I.Opening to Traffic Restri ct traffic from the grouted areas for 3 calendar days, or as directed by the Resident Engineer.
426.05 Method of Measuremen T
The Resident Engineer will not include the weight of water or sand in the measurements of Portland Cement or Fly Ash .
426.06 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:
A.CORED HOLES Each
B.PORTLAND CEMENT Ton [Metric Ton]
C.FLY ASH Ton [Metric Ton] Include the cost of water and sand to be included in the contract unit price for Portland Cement or Fly Ash. SECTION 433 RUBBLIZING PORTLAND CEMENT CONCRETE PAVEMENT
433.01 Description
This work consists of rubblizing and seating existing portland cement concrete pavement (PCCP).
433.02 Materials — Vacant
433.03 Equipment
A.Pavement Breaker Use a self -contained, self -propelled, resonant frequency pavement rubblizing unit capable of fracturin g the pavement. Ensure the unit produces low amplitude blows of 2,000 lb [9 kN] at a rate of at least 44 cycles per second. Equip the unit with a water mist system to suppress dust. Provide a screen to protect vehicles in adjacent lanes from flying chip s, as approved by the Resident Engineer.
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 299–301 of 935.