A 24-page report from the FHWA spotlights the use of precast concrete pavement along a section of I-90 near Issaquah, WA (about 20 miles east of downtown Seattle).  The project was made possible by an AID-PT* grant of $1,000,000 by FHWA to support the PCP test project. This case study report provides details of the PCP implementation by WSDOT to rehabilitate the distressed  pavement along the eastbound lanes of I-90 near Issaquah.

The report provides an overview of the project, details of the contracted work, and the requirements of the precast concrete pavement (PCP) panels. The illustrated report also describes the fabrication of the panels and the steps used to place the panels. 

The project was an important first step in the implementation of PCP by the Washington State DOT, the report says. To prepare for the project, the DOT participated in FHWA-sponsored workshops on PCP best practices, developed a provisional PCP spec, participated in an expert task group on PCP implementation, and along with the contractor and precaster staff, participated in just-in-time training. Click hereto view/download the 24-page report. 

Composite photo shows the location of the PCP project near Issaquah, WA, as well as the placement of the second panel.  (Photos:  Copyright property of Google® Earth™ and courtesy of Shiraz Tayabji, Ph.D., Advanced Concrete Pavement Consultancy LLC)

* The Accelerated Implementation and Deployment of Pavement Technologies (AID-PT) is a provision first included in the Moving Ahead for Progress in the 21st Century Act (MAP 21).  This ACPA-led initiative created both a mechanism and funding for the delivery of pavement technology.  In 2015, Congress included the program in the Fixing America’s Surface Transportation (FAST) Act, which provides funding through 2020.