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For
sake of perspective, the same few gallons
that were more than equivalent to a ton or
more of cement or lime, also replaced the
need for 308 tons of crushed aggregate by
providing a stabilized soil layer that had
a resilient modulus that was more than equivalent
to a layer of crushed aggregate base course
materials. The resilient modulus test data
was then incorporated in the Mechanistic-Emperical
Pavement Design Method, a design method promoted
by the American Association of State Highway
and Transportation Officials (AASHTO) and
the Federal Highway Administration (FHWA).
The stabilized soil layer was well under one-third
the delivered cost of the crushed aggregate
material that would have required a 60 mile
round trip trucking haul. While lime treatment
was an option that could have provided cost
savings on this project that ultimately included
a long paved access road off the state highway
and 15 acres of paved parking lots, the EMC
SQUARED System stabilizer products provided
$250,000.00 more in cost savings.
Demonstrating
effective performance, the EMC SQUARED System
stabilized clay roads and parking lot areas
provided all-weather support for the construction
traffic associated with the $100 million first
phase of construction through two extremely
wet winters. A delay in the government funding
for the second phase of construction also
delayed the planned placement of the hot mix
asphalt pavement surface course on top of
the stabilized clay base course. In spite
of far more than a year of delay in the paving
schedule, the stabilized clay access road
performed without need for repair, retaining
its stability and bearing strength with nothing
more than two inches of gravel spread on top
of the stabilized clay as a traction surface.
The areas of the construction site that were
not stabilized remained impassible for months
each winter and spring due to the saturated
clay soils. In addition to the cost-savings,
the advanced EMC SQUARED System soil stabilization
treatment also replaced the need for the mining
and manufacturing of 30,000 tons of crushed
aggregate and the road impacts and air pollution
associated with the 1,200 truck loads of aggregate
and a 60-mile round trip haul to deliver the
materials to the project location. With a
national goal of counteracting climate change
and a construction project located in the
San Joaquin Valley, an air basin contending
with extreme air pollution problems, reducing
the air pollution related to the mining operations
and road construction projects is an increasingly
important factor to evaluate when considering
design and construction alternatives. |