United States Department of Transportation
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Edition:Construction report
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
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Abstract:Prevention of reflective cracking in HMAC overlays placed over PCCP has been based on experience gained from trial and error methods of in-service pavements in many states. Arizona recently utilized this technique on a PCCP section of Interstate 40 between MP 152.1 and MP 158.6 EB and WB prior to placing a 4 inch HMAC overlay. Two sections, 500' in length, were cracked and seated on the WB roadway using 2 ft. x 2 ft. and 4 ft. x 6 ft. patterns, respectively. The remaining six miles of project IR-40-3(59)C were cracked and seated using a 3 ft. x 3 ft. pattern for both the EB and WB roadways. A Michigan whiphammer was used for cracking the pavement and a fifty ton pneumatic roller used for seating it. Visual identification of the cracking was difficult, but indicated a spider-web like crack pattern has been produced. The project, constructed in the fall of 1986, will be evaluated by ADOT annually for five years as Project AZ8604. The evaluation of this construction experimental feature will document the performance of the crack and seat technique and the effects of varying the crack pattern. A nine month evaluation is inclued with the construction report. /Abstract from report summary page/
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