393 Page 260393 CRACKING AND SEATING OF PCC PAVEMENT
393.1DESCRIPTION
The work consists of cracking and seating concrete pavement prior to placing an asphalt concrete leveling course.
393.2MATERIALS (Not Specified)
393.3CONSTRUCTION REQUIREMENTS
A.General: Cracking and seating will proceed continuously, during normal work hours, until the set of lanes under construction is completed. The pavement will be seated on the same working day that it is cracked. The asphalt concrete leveling course will be placed within 72 hours after the pavement has been cracked and seated. PCC pavement crossovers will be cracked with the same pattern used for the driving lanes. Work will be performed during daylight hours. Prior to cracking the concrete pavement, existing asphalt concrete overlays will be removed. B.Equipment: 1.Pavement Breaker : Pavement cracking will be accomplished with a spade or guillotine type breaker mounted on a vehicle capable of controlled forward and transverse movement. The breaker will be capable of fracturing the pavement to the full depth, while maintaining the fractured face interlock of the aggregate. 2.Roller: A pneumatic roller with a minimum loaded weight of 35 ton will be used to seat the cracked pavement. C.Cracking Locations: Pavement cracking will be performed transverse to centerline at 2 foot intervals ± 6 inches. Breakers will not be operated closer than 2 feet from an existing transverse joint. Cracking will be full pavement depth without loss of interlock. D.Test Section: Before routine cracking operations commence, the Contractor will demonstrate on a 200 foot test section on the project that the cracking and seating procedure is satisfactory to the Engineer. When inspecting the cores for cracking, it may be necessary to wet the core to verify cracking. The Contractor will core or saw samples of sufficient size to establish adequacy of cracking. A minimum of four samples will be required in the test section and one sample per lane mile for routine operations. If subsequent samples indicate that the established cracking procedure is not producing acceptable results, additional test sections may be required to re-establish an acceptable cracking and seating procedure. E.Seating: The cracked pavement will be seated by a minimum of two passes with the pneumatic roller. If two roller passes have not provided a firm seating of the cracked 393 Page 261pavement, the rolling will continue until the Engineer determines that the seating is adequate, or pavement removal is required. F.Cleaning: The cracked and seated pavement will be cleaned of dirt, spalls, and loose material by power brooming prior to tack coating. The cracked surface will be cleaned of loose material at the end of each working day.
393.4METHOD OF MEASUREMENT
A.Cracking and Seating PCC Pavement : Cracking and seating PCC pavement will be measured to the nearest 0.1 square yard. B.Cored or Sawed Sample: Cored or sawed sample will be measured per each.
393.5BASIS OF PAYMENT
A.Cracking and Seating PCC Pavement : Cracking and seating PCC pavement will be paid for at the contract unit price per square yard and will be inclusive of cracking, seating, test strips, surface cleaning, and all tools, equipment, and labor necessary to perform the work. B.Cored or Sawed Sample: Cored or sawed sample will be paid for at the contract unit price per each and will include all tools, equipment, and labor necessary to perform the work. If additional cores or sawed samples are required because previous samples indicated unacceptable results, the additional cores will be at the Contractor’s expense. 394 Page 262394 RUBBLIZE PCC PAVEMENT
394.1DESCRIPTION
This work consists of rubblizing the existing concrete pavement in preparation for an overlay.
394.2MATERIALS (Not Specified)
394.3CONSTRUCTION REQUIREMENTS
A.General: Rubblization of the concrete pavement will be accomplished across the width and full depth of the pavement. The rubblization will be done in partial widths when necessary to maintain traffic. The breaker will be operated to avoid damaging the base and underlying structures including, but not limited to; pipe, box culverts, edge drains, and utilities. If damage occurs to the base or underlying structures, the Contractor will repair any damage at no additional expense to the Department. The Contractor will minimize the dispersion of dust from the rubblizing operation, until the rubblized surface is overlaid, by the application of water or other approved method . Work will be performed during daylight hours. B.Equipment: 1.Requirements for all breakers: Rubblize the existing PCC pavement using either a self- contained, self-propelled multi-head paveme nt breaker; or a self-contained, self-propelled resonant frequency pavement breaker. Whip hammers, pile-driving hammers, crane and wrecking ball operations, and other equipment using up guided free-falling weights are not acceptable . The equipment used will deliver such energy as necessary to provide a crack, which is distinguishable to the naked eye from a standing position without the use of water or other materials. The breaker will be equipped with a screen to ensure debris will not enter the adjacent lane during the fracturing process, if traffic is maintained. 2.Multi Head Breaker: Breaking of the concrete pavement will be accomplished with a self- contained, self-propelled, unit with hammers mounted laterally in pairs with half the hammers in a forward row and the remainder diagonally offset in a rear row so that there is continuous breakage from side to side. The multi-head breaker must be capable of rubblizing a full lane width in a single pass to the degree specified in Section 394.3 C. 3.Resonant Breaker: Breaking the concrete pavement will be accomplished with a self-contained, self-propelled, resonant frequency-breaking unit capable of producing low amplitude 2000 pound force blows at a nominal frequency of not less than 44 cycles per second. The rubblizing operation will proceed in a longitudinal direction, beginning at a shoulder or previously broken edge and progress toward the opposite shoulder or longitudinal centerline of the roadway. The resonant breaker must be capable of rubblizing the full width of the pavement in multiple passes to the degree specified in Section 394.3 C.