ETL 1110-3-487
1 Mar 98
mix designs with local aggregates for both cold- and hot-mix asphalt mixtures. These asphalt
materials were eventually used to construct a hot-mix asphalt pavement. The following
paragraphs detail the information gained through conversations with various personnel at Eielson
AFB and Guam and an evaluation trip to Eielson AFB.
Eielson AFB, AK
(1) Introduction
The Alaska District, U.S. Army Corps of Engineers (CE), developed a roadway improvement
project to incorporate diesel contaminated soil and other waste materials into pavement
construction materials for a roadway project. This achieved two objectives: (1) the disposal of
contaminated materials in a cost-effective manner and (2) improvement of roadway quality with
minimal expenditure of funds. Personnel from the Alaska District and the USAE Waterways
Experiment Station formed a design team for this project. They established design sections and
specification requirements. Since the materials used for construction were not uniform and did
not meet all Corps of Engineers material specification requirements, the design requirements were
non-specific and the project required close field control. The term improved gravel surface was
used instead of ASB surface to prevent unrealistic expectations from Eielson personnel, because
of the unknowns caused by the materials used.
(2) Materials
The diesel contaminated soil came from the removal of an UST during construction on the
base. This resulted in the accumulation of approximately 230 m3 (300 yd3) of diesel contaminated
soil. Another of the waste materials used in the project was an asphalt cement. This asphalt
cement came from a site called the asphalt lake. This was the abandoned site of an asphalt plant
that was used during the initial construction of pavements on the base. This location was also
used for many years as the site for subsequent asphalt plant placement. This accumulation of
asphalt cement (asphalt lake) had been formed over the years through spillage and abandonment
of barrels of asphalt. In this remote area, barrels were often the only practical way to deliver
asphalt cement to the plant. Barrels left over from the initial construction were made of wood.
This asphalt cement contained pieces of wood, old metal tie bands, and other debris that had to be
removed prior to using the asphalt cement. The other waste material used was a recyclable
asphalt concrete pavement (RAP). The asphalt cement and asphalt cement saturated local soil
were removed from the asphalt lake and stockpiled directly on top of the RAP stockpile.
(3) Material Investigation
Prior to construction, a laboratory analysis was conducted to determine if the asphalt mixture
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