CA4PRS Implementation Project
for Long-life Pavement

The California Department of Transportation (Caltrans), which oversees a 78,000 lane-km state highway system, began implementing its Long-Life Pavement Rehabilitation Strategies (LLPRS) program in 1998. The goal of the LLPRS program -- which also addresses the state’s need for cost effective approaches for rebuilding the aging pavements in its urban highway network -- is to rebuild approximately 2,800 lane-km of high volume urban freeway with pavements that are designed to last more than thirty years with minimal maintenance. The LLPRS program will reduce the need for future repair projects and ultimately save public resources for future generations of road users. LLPRS candidate projects were selected from among highways that experience minimum volume demands of 150,000 Average Daily Traffic (ADT) or 15,000 Average Daily Truck Traffic, and that have poor structural pavement condition and ride quality. Most LLPRS candidate sections are Portland Cement Concrete (PCC) pavements on interstate freeways in urban networks, 80 percent of which are within the Los Angeles Basin, and 15 percent of which are in the San Francisco Bay Area.or more information, please refer to the following links)

LLPRS Pilot Project: I-10 Concrete Rehabilitation in Pomona

In February 2000, a 20 lane-km rehabilitation project on the Interstate 10 (I-10) near Los Angeles was successfully completed. Fast setting hydraulic cement concrete (FSHCC) was applied because it reaches traffic opening strength only in four hours after its placement. The project required one weekend closure to complete 2.8 lane-km and repeated 7- and 10-hour nighttime closures for the remaining distance. The rehabilitation project consisted of replacing the 230 mm concrete slab with new concrete, dowels, and tie bars. The contractor used a concurrent working method in which demolition and concrete paving occurred simultaneously and only a single lane was removed and replaced.

The delivery and discharge of concrete controlled the overall progress. The 55-hour weekend closure proceeded at a 54 percent faster rate than the average of nighttime closures, as measured by number of slabs replaced per hour. A comprehensive traffic management strategy helped to reduce the volume of traffic during the weekend closure and minimize the traffic delay through the construction work zone.

I-10 Pomona Project Archives

	Project Brochure
	Technical Report
	I-10 Construction Photos

LLPRS Demonstration Project: I-710 AC Rehabilitation in Long Beach

The Caltrans has successfully rebuilt a 4.4-km stretch of Interstate 710 (I-710) in Long Beach, which carries more truck traffic than any other route in the state. This long-life asphalt concrete (AC) pavement rehabilitation project -- which occurred during the summer of 2003 and in which either 230 mm of AC overlay or 325 mm of full-depth AC replacement were applied during eight repeated 55-hour weekend closures -- took a fast-track construction approach that included around-the-clock (24/7) operations. The project proved that fast-track rehabilitation with 55-hour weekend closures is effective to drastically shortening overall construction time and lessening the negative effects of construction in an urban area. The project also proved that AC pavement designed to provide a 30+ year design life can be constructed in a series of weekend closures even on the most heavily loaded truck route in the state.

I-710 Long Beach Project Archives

	Project Brochure
	Technical Report
	Construction Video Clip
	Traffic Simulation Video Clip
	I-710 Construction Photos

LLPRS Implementation Project: I-15 Concrete Rehabilitation in Devore

For the rehabilitation of a 4.5-km stretch of two badly damaged concrete truck lanes on Interstate 15 (I-15) near the city of Devore, Caltrans chose the “Rapid-Rehab” strategy. In this I-15 Devore project the two concrete truck lanes were successfully rebuilt in only two nine-days extended closures utilizing counter-flow traffic and around-the-clock operations. The pre construction schedule estimate projected that this project would take ten months using traditional nighttime closures. Instead, rebuilding took about nineteen days (with each extended closure for one roadbed lasting roughly nine days). The advantages of using this method of fast-track reconstruction included a significantly shorter period of disruption for the traveling public, new pavement with a thirty year life expectancy, increased safety for motorists and workers, and a 25 percent reduction ($6 million) in construction costs, compared with traditional repeated nighttime closures.

Innovations adopted for this groundbreaking “Rapid Rehab” project included:

• Automated Work Zone Information Systems (AWIS) to update travelers with real-time work zone travel information

• The Quickchange Moveable Barrier (QMB) System (by Barrier Systems Inc.), which provided dynamic lane configuration to minimize traffic disruption

• A rapid-strength concrete mix that made it possible to open the project to traffic twelve hours after its placement while still allowing for slip-form paving

• Web-based information systems for disseminating project updates and surveying public perception

• Incentive/disincentive provisions to encourage the contractor to complete the closures on time
  A multifaceted outreach program to gain public support and to help road users divert to alternate routes and adjust their daily commuting pattern

• A simulation-based framework incorporating macro- and microscopic simulation tools to analyze traffic performance through the construction work zone

The use of innovative technologies and intensive public outreach efforts reduced traffic demand by 20 percent and the maximum peak-hour delay by 50 percent of what was initially expected. Four-hundred respondents to two web surveys on the project web site showed a dramatic change in perception of the fast-track construction strategies, swinging from strong initial objection to support for future fast-track projects.

I-15 Devore Project Archives

	Project Brochure
	Technical Report
	Construction Video Clip
	Traffic Simulation Video Clip
	Devore Photos