Benefits of Rehabilitating Concrete Pavements with Slab Fracturing and Asphalt Overlays

Benefits of Rehabilitating Concrete Pavements with Slab Fracturing and Asphalt Overlays

Date: Thursday, June 4, 2:00 PM EDT

Description:

This project comprehensively synthesized both the historical and most recent experiences with crack and seat (C&S), break and seat (B&S), and rubblization methods for the rehabilitation of PCC pavements with asphalt overlays. An extensive literature review was performed, a comprehensive survey of key stakeholders was conducted, and a series of case studies were documented, with the goal of informing agencies and industry of the most effective concrete pavement rehabilitation methods.

Key Take Aways:

• C&S and rubblization were more popular than B&S for rehabilitation of PCC pavements.
• The edge drain system was not often used in PCC fracturing projects, although it showed effectiveness in reducing moisture-associated distresses.
• The majority of state agencies adopted the AASHTO 1993 method to design asphalt overlays on fractured PCC pavements, and the structural layer coefficient of the fractured PCC layer was determined based on the recommendation by the AASHTO 1993 design guide.
• The previously recommended threshold for fractured slab modulus (EPCC = 1,000 ksi) suggested by PCS (1994) does not appear to be suitable.
• Rubblized PCC slabs can be considered high modulus unbound aggregates. Placing an 8-inch asphalt overlay on top of rubblized PCC was found to meet criteria for a perpetual pavement if the rubblized slab modulus was greater than 81 ksi.

Registration: FREE

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