United States Department of Transportation
i
Structural Overlay Strategies for Jointed Concrete Pavements. Volume I: Sawing, and Sealing of Joints in AC Overlays of Concrete Pavements
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1990-06-01
[PDF-2.05 MB]
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Abstract:A major field study and evaluation has been conducted into the effectiveness of three structural overlay types for portland cement concrete (PCC) pavements. These include sawing and sealing asphalt concrete (AC) overlays of PCC pavements, cracking and seating PCC pavement prior to AC overlay, and constructing a thin bonded PCC overlay on top of the existing PCC pavement. Condition surveys, deflection testing, and roughness measurements were performed on a total of 55 sections. Based on the field data, guidelines were developed for the use of structural overlays. In addition, the results of this study were used to revise and enhance the EXPEAR rehabilitation advisory system. This volume examines the effectiveness of the sawing and sealing of AC overlays of PCC pavements. Sawing and sealing is an attempt to control, not prevent, the occurrence and severity of reflective cracks from the underlying PCC slabs. Joints are sawed in the AC overlay directly above joints in the existing slab and then immediately sealed. The first part of this report examines the literature and evaluates the performance of in-service saw and seal overlays. Part II develops many of the recommendations from the research effort into guidelines for techniques and specification for sawing and sealing operations.
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