Moving Advancements into Practice (MAP) Briefs describe promising research and technologies that can be used now to enhance concrete paving practices. The CP Road Map E-News is the newsletter of the Long-Term Plan for Concrete Pavement Research and Technology (CP Road Map)—a national research plan developed and jointly implemented by the concrete pavement stakeholder community.
The August 2015 MAP Brief “Spirit of St. Louis Airport Concrete Overlay”, takes a look back at one of the first large-scale concrete overlay projects at the Spirit of St. Louis Airport in Chesterfield, Missouri, USA. The overlay was completed in 1995 and is still performing well 20 years later:
The use of portland cement concrete to resurface existing pavements, both hot-mix asphalt (HMA) and concrete, has been documented as far back as the early 1900s. Many of the early concrete overlays performed very well, but it was only in the mid-1980s that concrete overlay technology began to gain national acceptance with agencies and engineers. Early in the 1990s, concrete overlay technology advancements made it possible for concrete overlays 5.1-cm to 10.2-cm (2-in to 4-in) thick over existing HMA to be used for various applications, including those subjected to heavy axle/wheel loadings. This technology was coined Ultra-thin
Whitetopping (UTW) (now referred to as Bonded Concrete Overlay on Asphalt Pavements) which incorporated the design concepts of “short” concrete panel size (.66-yd to 2yd (2-ft to 6-ft)) with “bonding” to the existing prepared asphalt surface. One of the first and largest projects in the country to incorporate UTW technology was at the Spirit of St. Louis Airport in Chesterfield, Missouri (MO). The Spirit of St Louis Airport is a busy general aviation facility serving as the home base of over 100 corporate jets.
To read the entire MAP Brief “Spirit of St. Louis Airport Concrete Overlay”, please click here.
News from the Road: News from the Road highlights research around the country that is helping the concrete pavement community meet the research objectives outlined in the CP Road Map. To read each of the articles from the August 2015 News from the Road Featured Headlines below, please click here.
News from the Road August 2015 Headlines:
Summary of NCC State Survey on Mechanical Rebar Splices
Q1: What are your requirements for mechanical splices?
Q2: If you have a slippage requirement, how is it handled with offset bar splice
MnROAD: Evaluating Recycled Aggregate in New Concrete Pavemen
Ground Tire Rubber as Component in Concrete Mixtures
Freeze-Thaw Resistance of Internally Cured Concrete
Innovative Proportioning for Concrete Mixtures
To find out more about the CP Road Map, or to get involved, contact:
Steve Klocke: E-Mail: sklocke@snyder-associates.com | Phone: 515-964-2020