United States Department of Transportation
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Edition:Final report.
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Abstract:This report documents the surface recycling of 7.688 miles (12.37 km) of Interstate 55 in Pike County from
about 10 miles (16.1 km) south of McComb to the Louisiana state line. The recycling equipment was by
Remixer Contracting Co., Inc. of Austin, Texas. The existing pavement was first heated, milled to 1.25 in.
(31.75 mm) depth, rejuvenator and virgin mix was added, and then the 1.5 in. (38.10 mm) of recycled mix
was re-laid and compacted. The daily productions proceeded with few problems on the four field inspection
days and averaged 0.69 lane-miles (1.11 lane-km) per day.
The reuse of the existing asphaltic concrete pavement is desirable because of the decreasing supply and increasing
costs of raw materials. The remixing leaves the final grade almost the same, which allows the user
the option of rehabilitation only one lane of a multi-lane highway and is a good safety factor.
Structural integrity was measured with the Dynaflect and Falling Weight Deflectometer. The South Dakota
profiler was used to obtain before and after International Roughness Index values.
Materials from the test roadway were sampled and compared with other roadways for viscosity, penetration,
and ductility, percent voids, density, specific gravity, percent asphalt, gradations, and resilient modulus.
After six years of service life, the recycled pavement proved its competency to perform comparably to conventional
hot-mix. This study found that pavements using reclaimed asphalt concrete material in the wearing
course mixes perform as well as pavements with normal mixes. The cost of each type of pavement was
found to be almost the same dollar/SY amount.
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