Summary of Rubber Modified Asphalt Product Specifications around ...
Summary of Rubber Modified Asphalt Product Specifications around ...
Summary of Rubber Modified Asphalt Product Specifications around ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
6.0 Terminal Blend Mix <strong>Specifications</strong><br />
Except for the usage <strong>of</strong> rubber modified asphalt produced at a terminal, the mix design and<br />
construction <strong>of</strong> terminal blend mix is very similar to the ones with conventional or polymer<br />
modified hot asphalt mix. Therefore, the <strong>Rubber</strong>ized <strong>Asphalt</strong> Cement section described<br />
previously should include the major points that should be paid attention to.<br />
7.0 <strong>Asphalt</strong> <strong>Rubber</strong> Chip Seals <strong>Specifications</strong><br />
<strong>Asphalt</strong> rubber chip seals normally result in better performance in terms <strong>of</strong> resisting reflective<br />
cracking and producing a longer life if placed correctly. This is due in large part to the higher<br />
binder content used during the application. The following sections describe the design and<br />
construction aspects <strong>of</strong> asphalt rubber chip seals.<br />
7.1 Design <strong>of</strong> <strong>Asphalt</strong> <strong>Rubber</strong> Chip Seal<br />
<strong>Asphalt</strong> rubber chip seals have been used in Arizona, California and Texas for many years. Table<br />
8 shows the general binder design, chip aggregate, and other key design related information. In<br />
California, the chip seals also have been placed with warm mix additives. This results in a lower<br />
application temperature and less emissions.<br />
Table 8. Design Parameters for <strong>Asphalt</strong> <strong>Rubber</strong> Chip Seal Applications.<br />
Agency Binder Chips Notes<br />
California/Caltrans <strong>Asphalt</strong> rubber field<br />
blend the same as<br />
hot mix.<br />
Binder application<br />
rate 2.5 - 3.0 L/m 2<br />
(0.55 – 0.66 gal/yd 2 )<br />
Arizona DOT CRM gradation<br />
shall be Type A<br />
coarser one.<br />
Binder application<br />
rate: 0.55 ± 0.05<br />
gal/yd2.<br />
Texas DOT ASTM Type II or<br />
Type III AR binder.<br />
Contractors provide<br />
AR design pr<strong>of</strong>ile.<br />
Chip seals 12.5<br />
mm; 9.5 mm<br />
gradation; Chip<br />
seal application<br />
rates are 15-22<br />
kg/m 2 and<br />
aggregate is<br />
precoated.<br />
Uniform sized<br />
aggregate 9.5<br />
mm.<br />
Aggregate<br />
application rates<br />
shall be 0.014<br />
cubic yards/yd 2 .<br />
Flush coat shall consist <strong>of</strong> an<br />
application <strong>of</strong> a fog seal coat<br />
followed by a sand cover to the<br />
surface <strong>of</strong> asphalt-rubber seal<br />
coat.<br />
Rock shall be pre-coated with<br />
0.40 to 0.60 % asphalt cement by<br />
weight <strong>of</strong> the aggregate.<br />
Use grade B CR for binder. When<br />
directed by the Engineer, apply a<br />
tack coat before applying the hot<br />
asphalt-rubber treatment.<br />
16
Change language