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Roller-Compacted Concrete Proves its Versatility
with the SCDOT
The South Carolina Department of Transportation (SCDOT) recently
witnessed the versatility of roller-compacted concrete (RCC) along
US78 near Charleston. To repair a heavily rutted five-lane section,
the SCDOT decided to use a semi-rigid pavement system composed of
2.0” asphalt surface and 10.0” of RCC (utilized as a
base) to repair the roadway and eliminate any future rutting.
RCC is a stiff, zero slump concrete mixture that is mixed, placed
and roller-compacted with the same commonly available equipment
used for asphalt pavement construction. RCC has generally been used
in ports, logging yards, warehouse facilities, etc. where heavy
static loads are present. Using RCC in a semi-rigid system is rarely
used in the United States but the idea is gaining popularity as
integrated pavement systems involving
cement-based solutions are being recognized as cost effective alternatives
to traditional paving techniques. Columbus, Ohio for example regularly
uses RCC in a semi-rigid system along local roads.
 Banks
Construction of North Charleston was awarded the approximately 1.0
mile section of US78 and AG Peltz of Birmingham, Alabama was chosen
to construct the 30,000 yd2 of RCC. Construction involved the milling
of 12.0” of existing rutted asphalt, placement of 10.0”
RCC and subsequent paving of the surface asphalt layer. All construction
was under heavy traffic control along the four-lane section containing
a center turn lane. With an AADT of over 40,000 and 10 percent truck
traffic, one lane was always open in both directions.
 AG
Peltz produced the RCC at an on-site pugmill adjacent to US78. The
aggregate used in the production of the RCC was a ¾”
minus SCDOT specification. Paving of the RCC proceeded when adequate
milling had been performed. RCC was placed directly on the milled
surface with an ABG-Titan high-density paver and final compaction
was performed by the use of a vibratory tandem steel wheel roller.
Joints were cut in the RCC at 20-foot intervals. The 2.0”
asphalt surface was placed in as little as two days on the RCC.
The use of RCC provided a cost effective pavement for the repair
of a severely distressed section of US78 near Charleston. Along
with the speed of construction and comparable cost to equivalent
pavement structures, RCC will provide a long lasting foundation
to a road plagued by an inadequate flexible pavement structure.
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