Roller Compacted Concrete (RCC)
is a zero slump concrete that is typically batched by pugmill or central batch concrete plant, transported by dump truck, placed with an asphalt paving machine and rolled with a 10 ton or larger roller. Curing can be accomplished either by moist cure methods or with a curing compound. RCC requires no reinforcement or jointing. Subgrade and base courses should meet the same requirements as those for conventional concrete pavement. Design thickness can be determined by referencing ACI 330, Guide for Design and Construction of Concrete Parking Lots. RCC has all the durability of standard concrete pavement, including resistance to fuels, oils, solvents, and other fluids, and the ability to withstand extreme hot and cold temperatures. Offering the benefits of a rigid pavement, RCC easily withstands the extreme loads commonly found in such applications as logging and mining roads, container handling yards, bulk handling and storage yards, intermodal transfer facilities, composting areas, car and truck parking lots as well as bases for streets and intersections. RCC will not rut from heavy axle loads, nor will it shove or tear from turning or braking vehicles.
|Typical Requirements of a
Roller Compacted Concrete Pavement Mix Design
||400 - 500 lbs.
||Size #67 or #8
||2000 - 2500 lbs.
||1000 - 1500 lbs.
RCC has been targeted by the Portland Cement Association as a high potential market for the concrete industry. PCA studies estimate that a potential of 4.5 million tons of cement could be utilized in the Northeast alone through the application of RCC pavement. At approximately 400 - 500 pounds of cement per cubic yard, that translates to over 20 million cubic yards of RCC!
The PCPC recently completed two demo projects for Roller Compacted Concrete pavement. The first of the two projects was placed at the Waste Management Services facility at Harrisburg Pike, Lancaster on Saturday, November 6th. This was a bid project to replace failed asphalt pavement at the entrance to the scales at the transfer station. Thanks to the promotion efforts of Don Simmons of Hercules Cement, Waste Management chose to use RCC to replace two-year old asphalt that was so badly rutted that smaller cars were actually bottoming out! RCC material was provided by Ready Mixed Concrete of Lancaster and was placed by McMinn's Asphalt, Inc., also from Lancaster. The total project was 100' x 12' and was placed approximately 7 1/2", compacted to 6"
The second project was at the Hercules Cement plant in Stockertown and was placed on Monday, November 22, 1999. The project was directed by Frank Lennox, Technical Services, Hercules Cement. The RCC was provided by F. A. Rohrbach Ready Mix and was placed as a combined effort of F. A. Rohrbach Inc. and Scheuermann Excavating. Two adjacent areas were paved at the Hercules plant. The first area measured 10' x 180' and was placed at 7" compacted to 5". This area will be used primarily by forklift trucks. The second area was slightly larger, at 20' x 100' and was placed at 8" compacted to 6". This roadway is used to access the bag cement facility and will be utilized by 10 - 12 tractor-trailer trucks per day. Cores were taken from the Hercules project to be broken at 8 day and 28 days. The 8-day strength test averaged 4600 psi. The 28-day strength results averaged 6000 psi.
A third RCC project has recently been bid at the Lehigh County Waste Water Pre-Treatment Facility in Fogelsville. Completion of this project is expected by spring of 2000.
What does RCC mean for your business? Low maintenance means less business interruptions. RCC requires virtually no maintenance, resulting in further savings over other conventional pavements. Paving with RCC gives you the benefits of a concrete parking lot for less. RCC is a high-performance pavement that is typically equal to or less than the cost of other conventional pavements.