Accelerated Concrete Pavement Rehabilitation

As highway agencies across the country attempt to balance rebuild existing highways while they reduce congestion and user delays and improving safety, the use of accelerated highway rehabilitation methods has become a necessity. This has been the case for the California De-partment of Transportation (Caltrans), which recently undertook a major concrete pavement rehabilitation project on I-15 near the city of Ontario, California. The I-15 Ontario Corridor carries about 200,000 ADT with 4-6 lanes each direction, about 6 percent of which is heavy trucks during peak hours. The size of the project is approximately $86 million in the engineer’s estimate cost. It is scheduled to start construction on February 2009 and to be completed by April 2010. The major scope of the project is the replacement of concrete pavement on two outside lanes in both directions along the 7.5-km (4.7-mi) stretch. Due to a complexity of con-struction access and rehabilitation process, the project was designed to implement various types of concrete pavement rehabilitation methods. Basically, the old concrete pavement will be re-placed with one of: (1) normal portland cement concrete (28-day curing-time mix); (2) rapid strength concrete (12-hour curing-time mix); (3) fast-setting hydraulic cement concrete (4-hou