PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 of concrete covering approximately half of the distributing augers to be desirable. The contractor may use spreaders in advance of the paver to control the concrete supplied to the paver.
pre-paving meeting submittal.
opening along the edges of the existing concrete using duct tape, caulk, or other approved material to prevent stones or grout from entering the saw cut.
of the paver tracks over the previously constructed pavement with no overhang across the pavement edge to prevent breaking. Use rubber facing, wood, or other approved protection if the paver tracks contact the existing pavement surface. Concrete in the completed lane must achieve a compressive strength of at least 2,000 pounds per square inch before placing adjoining pavement.
vibrators taking care not to dislodge previously placed dowel bars, tie bars, or tie bolts or to contact the forms.
a damp burlap drag longitudinally along the placement area. Texture and cure in accordance with Sections 501.3. 5 and 501.3. 6.
concrete compressive strength reaches 2,000 pounds per square inch. If stripping forms sooner than 5 -days following concrete placement, apply curing compound or extend other curing methods immediately.
modify the paver screed to provide a chamfer at the end of the PCC pavement that forms a wedge -shaped pavement edge.
pavement cross slope and width.
assist in the surface finish of small, irregular areas inaccessible to the paver. The Department will not allow steel trowels for finishing surfaces.
retardant through the use of a previously approved misting or fogging device. The Department will not allow application of water shaken from brushes or applied thro ugh a hose. PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 142 5. Finish the final pavement surface before texturing by pulling a wet burlap drag in the longitudinal direction. Keep the burlap in a moist condition throughout the paving operation to prevent surface tearing.
501.3.2 Slip -Form Paving.
an advance concrete spreader, will do the following:
the contract documents;
rounding, when checked using a 10 -foot straightedge;
concrete consolidation throughout the entire slab;
finishing; and
do not contact dowel bars, tie bars, tie bolts, other embedded hardware, or forms. Equip with a dowel bar inserter (DBI) if approved in advance by the engineer.
Provide mechanical saws capable of producing joints in accordance with the Standard Construction Details. Determine the number of saws needed based on weather, temperature, and amount of pavement placed. Provide backup equipment and lighting, if necessary, on site before beginning concrete placement.
Provide platforms spanning the full width of the paving pull for workers to finish, texture, and cure the concrete. Provide bridges that do not come in direct contact with the pavement surface.
Provide independently powered, self -propelled texturing equipment capable of adjusting the depth of tine penetration to produce the specified pavement surface texture.
Provide mechanically powered equipment to place curing compound at the specified rate on the pavement surface and on all exposed edges. Use a fully atomized mechanical sprayer equipped with a tank agitator and wind guard. Obtain the engineer’s approval for the use of alternate curing methods.
PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 143 1. Provide self -propelled machines equipped with gang -mounted diamond blades having a minimum cutting head width of 3 -feet with 50 to 60 diamond blades per foot of cutting head.
consisting of parallel grooves between 3/32 -inch and 5/32 -inch wide and 1/16 -inch deep. 501.3.3 Fixed Form Paving.
Use straight, metal forms a minimum of 10 -feet long having adequate strength to support the equipment. Use solid forms without horizontal joints with a depth equal to or greater than the prescribed edge thickness of the concrete and a base width at least equal to the depth of the forms. The base w idth is not required to exceed 8 -inches for deeper forms . Use flexible or curved forms for curves of 150 -foot radius or less. The contractor may use approved straight forms of 5 - foot lengths for curves of a radius from 75 to 150 -feet. Obtain the engineer’s approval for flexible or curved forms. The engineer may approve the use of wood forms in areas requiring hand finishing in accordance with Section 501.3.1.E.9.a. Secure the forms in place to withstand the impact and vibration of consolidating and finishing equipment without visible spring or settlement. Extend flange braces outward on the base a minimum of two thirds the height of the form. Remove forms with battered top surfaces or bent, twisted, or broken forms. Use repaired forms only after inspection and approval by the engineer. Use buildup forms only where the total area of pavement of any specified thickness on the project is less than 2,000 square yards. Ensure that the top face of the form does not v ary from a true plane more than 1/8 -inch in 10 -feet and that the vertical face of the form does not vary by more than 1/4 -inch. Make provisions for locking the ends of abutting form sections together tightly, and for secure setting.
track that enables spreading, finishing, and curing equipment to back over the end of the previous day’s run.
out of the way. Provide rails of sufficient height that all wheels and flanges of wheels clear the previously placed concrete by at least 1/2 -inch.
Provide a foundation under the forms so that the length and width of the form is firmly in contact with the grade.
Stake forms into place with a minimum of 3 pins for each 10 -foot section. Place a pin at each side of every joint. Lock form sections tightly to prevent play or movement in any direction. Do not deviate the form from true line by more than 1/4 -inch at any point. The Department will not allow excessive settlement or springing of forms from the finishing machine’s weight. Clean and oil forms before placing concrete.
Check the form alignment and grade elevations immediately before placing the concrete. Reset and recheck disturbed forms or areas of unstable grade.
The contractor may remove forms when the concrete is self -supporting. PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 144 501.3.4 Equipment.
Replace Section 501.3.2.A.2 with the following for fixed form paving:
previously set forms and can work independently, or in conjunction with, an advance concrete spreader. Provide a finishing machine containing or capable of:
the contract; and
finishing.
equipment or mount on a separate carriage. Only operate the vibrators during forward motion of the machine. Operate hand vibrators no more than 10 -seconds and no less than 5 -seconds in any 1 location unless approved otherwise by the engineer. Place vibrators in the concrete and withdraw slowly in a vertical direction. To obtain concrete consolidation near the joint assemblies, the engineer may require hand v ibration with an immersion spud vibrator. Prevent vibrators from contacting dowel bars, tie bars, tie bolts, other embedded hardware, or forms. Use the number and frequency settings of the vibrators to achieve uniform consolidation of the concrete throughout the entire slab thickness and width.
type vibrators with a frequency of no less than 5,000 impulses per minute for tube vibrators and no less than 7,000 impulses per minute for spud vibrators. Wh en using either hand -operated spud type internal vibrators, or spud -type internal vibrators attached to spreaders or finishing machines adjacent to forms, ensure that these vibrators have a frequency of no less than 3,500 impulses per minute. Always provid e an impulse calibrator for verification of vibrator impulses. When using the existing pavement to support the finishing machine instead of a form, adjust the wheels of finishing machines to provide full bearing on the pavement and extended to prevent brea king the pavement edge.
designed for this purpose and approved by the engineer or use an approved machine that concurrently trims the subgrade or subbase to grade.
placed concrete, ensure that the wheels or tracks bearing on the concrete stay at least 3 inches from the previously placed pavement edge. The contractor may double flange the wheels when opera ting with 1 side of the machine on pavement and the other side on forms. Use flangeless, rubber -faced wheels on the pavement. When operating over the edge of concrete less than 2 months old, support the ends of the finis hing machine screeds with an approved device to provide a clearance of 1/16 to 1/8 -inch between the screed and previously placed pavement. PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 145 501.3.5 Texturing.
Provide a tining device with flat steel wire tines 3/32 -inch wide and 5 to 6 -inches in length, unless otherwise approved, having a 3/4 -inch spacing between the tines. The tines shall form rectangular shaped grooves from 1/16 to 3/16 -inch deep. Do not texture portions of the pavement that will receive permanent pavement markings. In these areas, maintain a 10-inch -wide flat surface to accommodate striping or raise d pavement markers. The Department will accept the burlap drag finish for these areas.
without dragging or tearing the mortar.
fail to penetrate the surface by the minimum 1/16 -inch. The contractor shall decide when to begin tining.
above, for areas inaccessible to the mechanical tining device.
texture instead of tining. If the contractor cho oses the diamond grinding method, grind only after the concrete obtains a compressive strength of at least 3,500 pounds per square inch. Submit information on similar types of work performed with the proposed grinding equipment, including references if requ ested by the engineer. 501.3.6 Curing Methods.
the texturing operation.
following the tining operation and apply the second coat no more than 30 -minutes after the first coat.
the pavement until the compressive strength reaches at least 2,000 pounds per square inch.
pavement thickness. Add weight to secure the material against wind and weather.
strength reaches at least 2,000 pounds per square inch. At sawed joint locations, remove as little polyethylene as possible just before the sawing operatio n. Replace the polyethylene over the sawed joint immediately upon completion of the sawing operation and maintain for the remainder of the curing period. 501.3.7 Quality Control Plan. PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 146 Develop and submit a quality control plan in accordance with Section 610.3.A and following the weather limitations in accordance with Section 501.3.8. 501.3.8 Weather Limitations.
curing period of 3 -days following placement. Provide all necessary monitoring devices such as high -low thermometers or other tools and a plan for monitoring the temperature during the 3 - day period. Address use of insulating blankets, straw, polyethylene, or other protection, in the quality control plan.
advance of the concrete placement. Perform finishing, texturing, and curing operations as soon as possible. Suspend paving if the pavement surface dries to the extent that the contractor cannot finish the concrete without application of surface water.
concrete exceeds 90 degrees F. 501.3.9 Joints.
in accordance with Section 504, if no overlay is planned.
the pavement surface.
cracking does not occur.
judgment. Center the saw cuts over the dowel bars or tie bars . Following saw cutting, provide crack -free pavement except for the cracks under the designed saw cut joints.
resulting in a non -planned paving stoppage exceeding 30 -minutes.
resulting joint must create a vertical face perpendicular to the pavement conforming to the designed cross slope. Drilling and grouting procedures and related mat erials must accompany the submission, if applicable. Provide a grout retainer ring if installing dowels by drilling and epoxy grouting. PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 147 4. When placing concrete pavement abutting existing concrete, provide a sealant reservoir in accordance with the Standard Construction Details.
501.3.10 Opening the Road to Traffic. Open the road to traffic when the concrete compressive strength reaches at least 3,500 pounds per square inch. 501.3.11 Performance Measures.
following:
no less than that specified.
testing as determined by the engineer.
approval.
measured using a 10 -foot straight edge.
devices.
devices.
PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 148 501.3.12 Tolerance in Pavement Thickness.
case, the Department will consider these irregular lots a complete lot when evaluating the pavement thickness, regardless of the actual size.
pavement thickness, the Department will take 2 additional randomly selected cores within the same lot. The Department will consider cores measuring 0.20 -inches or more in excess of the plan pavement thickness to measure exactly 0.20 -inches greater than the planned thickness when computing the average of the 3 cores. The Department will consider the average thickness of the 3 cores as the pavement thickness for th e lot the Department is evaluating. The Department will use this lot thickness to determine payment for the entire lot in accordance with Table 501.5 -1.
is deficient by more than 1 -inch when compared to the plan pavement thickness. The engineer will provide the limits of the lot in question. 501.3.13 Pavement Smoothness.
Test finished surfaces of concrete pavements, bridge decks, approach slabs, and transition slabs in accordance with the contract using an inertial profiler or 10 -foot straight edge. The maximum allowable longitudinal and transverse deviation is 1/4 -inch in any 10-feet. Provide a 10 -foot straight edge for testing smoothness.
Use diamond grinding to remove deviations exceeding 1/4 -inch in 10 -feet. Submit information on similar types of work performed with the proposed grinding equipment, including references if requested by the engineer.
501.4Method of Measurement.
measure the longitudinal dimension along the centerline of pavement.
meet other performance measures until the contractor makes repairs. In these cases, the Department will withhold the actual repair area quantity from payment.
501.5Basis of Payment.
PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 149 A. Payment includes placing, finishing, texturing, and curing concrete pavement meeting the performance measures outlined in Section 501.3.11. The Department will consider the following items incidental to the work and will not pay for the items separately :
before concrete placement;
event or other emergency;
providing verification of their location and alignment using non -destructive testing devices; and
control. 501.5.1 Pavement Thickness Adjustments.
schedule provided in Table 501.5 -1. Table 501.5 -1. Price Adjustments for Concrete Pavement Thickness Deficiency Deficiency in Average Pavement Thickness Determined by Cores Proportional Part of Contract Unit Bid Price (%) 0.00 to 0.20 -inches 100 0.21 to 0.30 -inches 80 0.31 to 0.40 -inches 72 0.41 to 0.50 -inches 68 0.51 to 0.75 -inches 57 0.76 to 1.00 -inches 50 Greater than 1.00 inch Remove and Replace
with an average thickness in excess of that shown in the contract. The Department will consider PORTLAND AND CEMENT CONCRETE PAVEMENT SECTION 501 150 the plan pavement thickness as the maximum pavement thickness value used in this chart for a 1,000 square yard lot. 501.5.2 Pavement Smoothness Adjustments. The Department will apply incentive or disincentive pay adjustments as established by this specification and in accordance with the contract. 501.5.3 Low Strength Concrete Adjustments. The Department will consider concrete that fails to reach full 28 -day design strength (f' c) subject to remedial action. The Department will make prorated payment in accordance with Section 610. 5.D. Remove and replace concrete having compressive strength of 500 PSI or more below the designed (f'c) of the pavement. ITEM DESCRIPTION UNIT 501001 PCC PAVEMENT, 8” SY 501002 PCC PAVEMENT, 9” SY 501004 PCC PAVEMENT, 10” SY 501005 PCC PAVEMENT, 11” SY 501006 PCC PAVEMENT, 12” SY 5010 07 PCC PAVEMENT, 14” SY