The primary end-use for recycled shingles is paving. Paving
falls into 2 main categories—that which meets state
specifications (spec) and that which does not.
Spec vs non-spec roads: State-funded paving must meet state
specs which are based on Federal pavement performance
standards and local climatic conditions and reflect engineering
intended to maximize pavement durability. Paving projects not
using state or federal funds, such as those controlled by either
local authorities or private parties, are not required to meet state
specs but often voluntarily follow the state specs rather than
develop their own, separate specs.
The following options represent spec-based end-use options,
although non-spec pavement can also apply these standards.
Aggregate Base CourseCourse-ground shingles (2½”
minus) can be added to aggregate materials as part of the lower
pavement layers—the sub-base, base, or binder courses.
Hot Mix Asphalt (HMA)Fine ground shingles (½” minus)
can be added at 5% by weight of HMA for use in the wear/
surface course. Shingles are added to HMA in the same manner
as recycled asphalt pavement (RAP). The shingles can replace
some virgin asphalt and aggregate. This substitution, however,
usually requires the use of a softer virgin asphalt to offset the
effect of adding the harder asphalt in the recycled shingles.
Temporary Roads,
Driveways, or Parking
LotsCoarse-ground
shingles (2½” minus) can
be used for dust control on
bare ground; as an
economical alternative to
ground covers such as
gravel, stone, or wood
chips in low traffic areas;
and on non-spec roads such as farm lanes, rural roads, or
temporary construction surfaces.
Cold Patch MixShingles can be ground to ½” minus size
and used alone or combined with virgin asphalt or other
materials for use as a cold patch material. In some instances,
these patches last longer than virgin patch materials.
Expansion JointsFine ground shingles (½” minus) combined
with virgin asphalt can be used as expansion joints for concrete
pavements.
New Roofing MaterialUsing fine ground shingles (½”
minus) as a material input in the manufacturing of new roofing
shingles is still in the experimental phase. Problems surround
the control of the quality of recycled shingles as a feedstock
and the assimilation of recycled shingles into the manufacturing
process.
The primary end-use for recycled shingles is paving. Pavingfalls into 2 main categories—that which meets statespecifications (spec) and that which does not.Spec vs non-spec roads: State-funded paving must meet statespecs which are based on Federal pavement performancestandards and local climatic conditions and reflect engineeringintended to maximize pavement durability. Paving projects notusing state or federal funds, such as those controlled by eitherlocal authorities or private parties, are not required to meet statespecs but often voluntarily follow the state specs rather thandevelop their own, separate specs.The following options represent spec-based end-use options,although non-spec pavement can also apply these standards.Aggregate Base CourseCourse-ground shingles (2½”minus) can be added to aggregate materials as part of the lowerpavement layers—the sub-base, base, or binder courses.Hot Mix Asphalt (HMA)Fine ground shingles (½” minus)can be added at 5% by weight of HMA for use in the wear/surface course. Shingles are added to HMA in the same manneras recycled asphalt pavement (RAP). The shingles can replacesome virgin asphalt and aggregate. This substitution, however,usually requires the use of a softer virgin asphalt to offset theeffect of adding the harder asphalt in the recycled shingles.Temporary Roads,Driveways, or ParkingLotsCoarse-groundshingles (2½” minus) canbe used for dust control onbare ground; as aneconomical alternative toground covers such asgravel, stone, or woodchips in low traffic areas;and on non-spec roads such as farm lanes, rural roads, ortemporary construction surfaces.Cold Patch MixShingles can be ground to ½” minus sizeand used alone or combined with virgin asphalt or othermaterials for use as a cold patch material. In some instances,these patches last longer than virgin patch materials.Expansion JointsFine ground shingles (½” minus) combinedwith virgin asphalt can be used as expansion joints for concretepavements.New Roofing MaterialUsing fine ground shingles (½”minus) as a material input in the manufacturing of new roofingshingles is still in the experimental phase. Problems surroundthe control of the quality of recycled shingles as a feedstockand the assimilation of recycled shingles into the manufacturingprocess.
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