The purpose of crack & seat of concrete pavement prior to overlaying it is to minimize the occurrence and severity of reflection cracks in the overlay caused by slab action by cracking the concrete slabs to reduce their effective length and then seating the cracked slabs to reestablish support between the subbase and the slabs. Some specifications require that the road be opened to traffic after cracking to accomplish the seating prior to paving the overlay. Other specifications require a proof roller be used to seat the cracked concrete. Most cracking has been performed with the T8600 Badger Breaker® although the MHB Badger Breaker® is also used for cracking.
Feb 11, 2015
Evaluation of Concrete Slab Fracturing Techniques in Mitigating Reflective Cracking Through Asphalt Overlays
This report presents the results of an evaluation of concrete slab fracturing techniques as a means of arresting or retarding reflective cracking through asphalt overlays placed on severely distressed portland cement concrete pavement.
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Crack and Seating Done Without Removing Asphalt Surface on Runway Rehab Project
When culling old documents from file cabinets, one sometimes discovers reminders of past accomplishments that bring back good memories. Antigo Construction performed crack & seat of Runway 5/23 at Columbus Airport (IN) in 1988. The project was unique in that the 8-inch-thick concrete pavement was cracked and seated without first removing the existing 6-inch- to 2-inch-thick asphalt overlay. Nondestructive tests (now known as falling weight deflectometer) were performed to measure the elastic moduli of the concrete layer before and after cracking and seating. The testing confirmed effective cracking and seating of the concrete layer. This article from 37 years ago reminds us that though much has changed in the construction of pavements, the basic concepts of fracturing concrete pavements prior to an asphalt overlay still apply today.
Miscellaneous Crack & Seat Controlled-Access Highways
Jan 28, 2025
California Interstate Crack & Seat Concrete Pavement with Asphalt Overlay Projects, 1991-2024
List of projects
Miscellaneous Crack & Seat Local Roads
Jan 28, 2025
Crack & Seat Concrete Pavement with Asphalt Overlay Projects – Southeast Wisconsin Local Roads, 1983-2024
List of projects
Miscellaneous Crack & Seat 2-Lane Highways
Jan 28, 2025
Crack & Seat Concrete Pavement with Asphalt Overlay Projects – Iowa 2-Lane Highways, 1986-2024
List of projects
Articles Crack & Seat Controlled-Access Highways
May 19, 2022
Caltrans Plans for Perpetual Pavement
This very successful crack & seat and asphalt overlay project received an Asphalt Pavement Alliance 2021 Perpetual Pavement by Design Award.
