Asphalt Rubber Technology Service
| Mix
Design |
 |
 |
|
The
rubber-modified liquid asphalt contains 10% minus 40-mesh rubber. |
The
rubber-modified liquid is reacted for 15 minutes at 350° F. |
SCDOT
Superpave Mix Design Procedures are Used |
 |
 |
| Aggregate
pans are batched in correct proportions along with hydrated lime
and heated to 50° F above compaction temperatures. |
Rubber-modified
liquid asphalt is heated to mixing temperature and added to aggregate
batches in correct proportions for four different asphalt contents.
(ex. 5.0%, 5.5%, 6.0%, 6.5%) |
 |
 |
|
Rubber-modified
liquid asphalt and aggregate batches are mixed with mechanical mixer
to form a homogeneous mixture. |
Loose
mix batches are "cured" in the oven at compaction temperature
for 2 hours. |
 |
 |
Loose
mix batches are dumped into molds using a funnel and temperature
is checked. |
Samples
are compacted using Superpave gyratory compactor. |
 |
 |
|
Volumetric
properties of compacted sample "pills" are measured (ex.:
air voids, VMA, and VFA) and optimum apshalt content is chosen. |
Final
mix design specifies optimum proportions of "ingredients"
(lime, modified asphalt cement, coarse aggregate and fine aggregate)
to be used to make rubber-modified HMA at the contractor's plant. |
2002 HUGO DRIVE • CLEMSON UNIVERSITY • CLEMSON, SC 29634
PHONE: (864) 656-6799 • FAX: (864) 656-6186 • EMAIL: arts@ces.clemson.edu