A one-page overview of cement based solutions for pavements.
Concrete pavements have long been recognized as clean, smooth riding, strong, and durable, and properly designed and constructed concrete pavements should provide several decades of zero- to low-maintenance service. At times, it is necessary to cut trenches in some concrete pavements, particularly in urban areas, in order to repair or install utilities such as sewers, drainage structures, water mains, gas mains and service
lines, telecommunication lines, and power conduits. Unless the cost of trenchless methods that do not disturb the pavement is justified, the pavement must be opened up, the utility installed or repaired, and the pavement restored using a utility cut restoration. If these operations are carried out properly (see Appendix 1 for the step-by-step process of making a utility cut in a concrete pavement), there will be minimal impact on the pavement’s functional serviceability, ride quality, and lifespan.
VIDEO TOUR — This is a video showing the use of LCC to accelerate road construction on Highway 35 in the Santa Cruz Mountains.
Concrete pavements have long been recognized for their longevity and low life cycle costs. A large number of concrete pavements constructed in the 1920s and 1930s in California are still in use today, serving communities for 70 to 80 years with little maintenance cost. The history of these pavements, including their exceptional longterm performance, has not been told and the story that they tell is being lost as many of these 80 to 90 year old historic concrete pavements are being rehabilitated with asphalt overlays or reconstructed.
About This Guide
This Guide to Full-Depth Reclamation (FDR) with Cement is a product of the National Concrete Pavement Technology Center (CP Tech Center) at Iowa State University’s Institute for Transportation, with funding from the Portland Cement Association. Th e guide provides a concise discussion of all aspects of selecting, designing, and constructing a reclaimed, cement stabilized asphalt base in preparation for a new pavement surface layer.
Roller-compacted concrete, or RCC, takes its name from the construction method used to build it. It’s placed with conventional or high-density asphalt paving equipment, then compacted with rollers. RCC has the same basic ingredients as conventional concrete: cement, water, and aggregates, such as gravel or crushed stone.
Concrete pavement restoration, or CPR, is a series of engineered techniques developed over the past thirty years to manage the rate of pavement deterioration in concrete streets, highways, and airports. CPR is a non-overlay option used to repair isolated areas of distress in a concrete pavement without changing its grade. This rational, preventive procedure restores the pavement to a condition close to original and reduces the need for major and more costly repairs later. In fact, recent reports from the Transportation Research Board state that for every dollar invested in appropriately timed preventive pavement maintenance, three to four dollars in future rehabilitation costs are saved.
Concrete pavements have long been recognized as clean, smooth riding, strong, and durable, and properly designed and constructed concrete pavements should provide several decades of zero- to low-maintenance service. At times, it is necessary to cut trenches in some concrete pavements, particularly in urban areas, in order to repair or install utilities such as sewers, drainage structures, water mains, gas mains and service lines, telecommunication lines, and power conduits.
FDR-C uses less cement and water than conventional concrete and concrete base. The FDR-C unconfined compressive strengths are correspondingly less than these materials.
The FDR-C pavement rehabilitation process pulverizes and shapes the existing AC pavement and a portion of the underlying materials, and mixes the pulverized materials with cement and water, usually in a separate operation. The processed mixture is then graded, compacted, and surfaced.