Structural Overlay Strategies for Jointed Concrete Pavements. Volume 1. Sawing and Sealing of Joints in AC Overlays of Concrete Pavements

摘要

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 pavements 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. The performance of these sections was evaluated and the effectiveness of each overlay type analyzed. Based on the field data, guidelines were developed for the use of structural overlays. In addition, the results of the study were used to revise and enhance the EXPEAR rehabilitation advisory system. The 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 the report examines the literature and evaluates the performance of inservice saw and seal overlays. Part II develops many of the recommendations from the research effort into guidelines for techniques and specifications for sawing and sealing operations.