Specs

Proposed Bridgestone April 20, 2011
NWC of Vance St. & W. Center Ave. PSI Project No. 532281
Lakewood, Colorado Page 12 of 15
The following table presents pavement section thicknesses if swell mitigation through
overexcavation and replacement with moisture conditioned and compacted import soils
is selected.
Pavement Area
Composite Section
(inches)
Full-Depth Asphalt
(inches)
Full-Depth
Portland Cement
Concrete (inches)
Light Duty Traffic
Parking Stalls
(EDLA = 2)
Heavy Duty Traffic
Drive Lanes
(EDLA = 5)
2 ½ inches Asphalt
over
5 inches Aggregate
Base Course
3 inches Asphalt
over
6 inches Aggregate
Base Course
4 ½ inches 4 ½ inches
5 inches 4 ½ inches
Concrete pavement at least seven inches thick is recommended for the trash
dumpster run-up due to the heavy wheel and impact loads that this area receives. The
run-up should extend far enough away to support all wheels of the sanitation truck while
stopped and in the loading position. Concrete pavement is also recommended in areas,
which receive continuous repetitive traffic such as product unloading areas and parking
lot entrances.
6.4.3 Lime Stabilization
In the proposed pavement areas, as an alternative to overexcavation and replacement
with on-site or imported structural fill material, PSI recommends that the pavement
subgrade be chemically stabilized with lime. The pavement subgrade should consist of
a mixture of native or imported soils, hydrated, or quick lime and water as outlined by
ASTM C997 and CDOT 307.
If this alternative is selected, PSI recommends that the pavement subgrade be
overexcavated to a depth of 12 inches below grade and that the existing subgrade be
blended with hydrated or quick lime and recompacted to provide a suitable pavement
support section.
The lime mix design should meet the following requirements:
Minimum pH of 12.4 after completion of initial mixing
Plasticity Index (PI) less than 6
Minimum hydrated lime of 5.0 percent by dry weight
Minimum unconfined compressive strength of 200 psi (28,800 psf)
Sulfate concentrations not to exceed 0.5 percent