More recently, RCC pavement has been used in parking lots, auto manufacturing plants, intermodal ports, military bases, and warehouses. The Tennessee Valley Authority used 8000 cubic yards of RCC as structural fill to support the turbine building slab at the Bellefonte Nuclear Power Plant in Scottsboro, Ala. In 1980, the Ocoee No. 2 Dam in Ocoee, Tenn., was home to the first use of RCC for overtopping protection. And, in 2001, Honda chose RCC for more than 100 acres of pavement for its new car manufacturing plant in Lincoln, Ala.

The Southeast Cement Association has been pitching RCC as a product that is appropriate for smaller projects, and for the large-scale jobs on which it has historically been used. Industrial park roads, small-scale site paving, and residential projects all are candidates for RCC, Singel said.

“Though (RCC) has typically been promoted for large-scale projects, we're finding that large projects are not necessary to realize its cost effectiveness,” he said.

MEETING WITH SUCCESS

The association sold GDOT on RCC when it took some of its decision makers to General Motors' Saturn manufacturing plant in Spring Hill, Tenn. The facility is the largest RCC pavement project ever built, encompassing 134 acres of plant roads, vehicle storage yards, and delivery areas. The outstanding condition of the roads after more than a decade of continual use convinced the DOT to give the product a try on its I-285 shoulder reconstruction project.

“The durability, useful life, constructability, structural value, and ease of maintenance were some of the key reasons why (GDOT) elected to try it,” said Poole, who viewed RCC project sites in Tennessee before casting his vote to use the durable mix on the I-285 shoulders. “GDOT is always interested in using the latest technology, safety devices, and roadway materials in our efforts to provide the safest and best roads in the nation.”

RCC's use on the shoulders of high-traffic roadways has passed muster. GDOT recently OK'd plans to place RCC on the shoulders of a 6 1/2-mile-long stretch of State Route 6 in Cobb and Douglas counties. Here, crews will place RCC on the 6 1/2-foot-wide shoulders and median of the five-lane roadway. The pavement sits on a heavily traveled route and is adjacent to a railroad transfer terminal where numerous tractor trailers will haul heavy loads across the surfaces.

According to Poole, GDOT also has used its own forces to place RCC on small-scale jobs along interstate ramps and has been pleased with its performance. The department also is considering using RCC on several park-and-ride lots, although none are yet confirmed. PW

Bacon is a Seattle-based business writer.

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Crews placed RCC for the shoulders along Interstate 85 in one lift; by contrast, asphalt typically is placed in several lifts of 2 or 3 inches each. Photos: GDOT

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Left: The Georgia DOT has placed RCC with conventional and with high-density asphalt paving equipment. Right: The RCC mixture is placed with asphalt paving equipment, then compacted with 10- to 12-ton steel-drum rollers (shown here) and pneumatic-tire rollers.