SECTION 454: CRACKING AND SEATING CONCRETE PAVEMENT
454.1 Description
This Work consists of cracking and seating existing portland ce ment concrete pavement.
454.2 MATERIALS—Reserved
454.3 Construction Requirements
454.3.1 Equipment
The Contractor shall use impact hammers capable of cracking the pavement’s full depth. The Contractor shall equip the breaker with a plate-type shoe o r use one designed to prevent penetration, spalling, and shatteri ng of the existing surface, the Contractor shall use other Equipment approved by the Project Manager. The Contractor shal l not use a headache, drop ball, or whip hammer. If required, the Contractor shall provide a screen to protect v ehicles in the adjacent lane from flying chips during the cracking process. The Contractor shall use pneumatic tire rollers that weigh a mi nimum of 50 ton.
454.3.2 Cracking Operations
Before cracking the concrete, the Contractor shall remove exist ing asphalt patches. Before cracking, the Project Manager will designate test sectio ns. The Contractor shall crack the test sections using varying energy and striking patterns to establish an optimum pattern for cracking the pavement. The Contractor shall wet the pavement s urface test section to determine the extent and pattern of cracking. The Contractor shall use the established pattern to crack the p avement on the remainder of the Project, provided the cr acked pavement continues to meet the specified size requirements. The Contractor shall adjust the energy and strik ing pattern as directed by the Project Manager. The Contractor shall wet pavement surfaces at least once an hour to determine the extent and pattern of cracking. The Contractor shall crack the existing concrete pavement so th at the dimensions of the majority of pieces of pavement a re from 18 inches to 24 inches, with a maximum dimension of 30 inches. The Contractor shall ensure that 80% of pavement pi eces are smaller than 24 inch. The Project Manager will determine the adequacy of pa vement breakage. The Contractor shall perform cracking one (1) lane at a time wi th an impact hammer. The Contractor shall prevent damage to underground utilities, d rainage facilities, Bridge approach slabs, and Bridge decks. The Contractor shall repair damage at no additional cost to the Department.
454.3.3 Seating Operations
After cracking the concrete pavement, the Contractor shall clea n the surface of loose and spalled concrete and foreign Material. The Contractor shall roll the cracked concrete with a pneumatic tire roller within 24 h before overlaying with HMA until it is well seated and thorough ly and uniformly compacted. Section 454: Cracking and Sealing Concrete Pavement Page 260 The Contractor shall crack slab sections (that do not seat well under the roller) into smaller sections and roll them again. The Project Manager will determi ne when the pavement is properly cracked and seated. The Department will allow traffi c on the cracked pavement befor e overlaying. When routing traffic over the cracked pavement, the Contractor shall ensure the pavement’s condition is satisfactory to carry the traffic.
454.4 Method of Measurement
Cracking and seating concrete pavement will be measured by the square yard.
454.5 Basis of Payment
Pay Item Pay Unit Cracking and Seating Concrete Pavement Square Yard
454.5.1 Work Included in Payment
The Department will consider as included in the payment for th e pay item(s) listed in this section and will not measure or pay separately for the followin g Work: 1. Cracking concrete pavement full depth; 2. Remove existing asphalt patches; 3. Clean cracked concrete surface of loose debris; and 4. Roll cracked concrete pavement. Section 455: Diamond Grinding and Diamond Groov ing of Portla nd Cement Concre te Pavement Page 261