Summary of Rubber Modified Asphalt Product Specifications around ...
Summary of Rubber Modified Asphalt Product Specifications around ...
Summary of Rubber Modified Asphalt Product Specifications around ...
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1151.03 DEFINITIONS<br />
Section 1151.03 <strong>of</strong> OPSS 1151 is amended by addition <strong>of</strong> the following:<br />
Ambient Ground: means scrap tire rubber processed or ground at or above 20°C to provide irregularly shaped,<br />
torn particles with relatively large surface areas.<br />
Crumb <strong>Rubber</strong> (CR): means scrap tire rubber that is reduced in size for use in asphalt paving materials such as<br />
hot mix asphalt or asphalt cement or both.<br />
Cryogenic Ground: means scrap tire rubber processed or ground at temperatures low enough that the rubber<br />
shatters.<br />
<strong>Rubber</strong>ized <strong>Asphalt</strong> Cement (RAC): means asphalt-rubber binder; which is PGAC modified with crumb<br />
rubber through the wet process.<br />
<strong>Rubber</strong> <strong>Modified</strong> <strong>Asphalt</strong> (RMA): hot mix asphalt that contains crumb rubber added as an aggregate, as RAC<br />
or as both. May also refer to CR added with the asphalt cement to the aggregates during mix production <strong>of</strong> the<br />
HMA.<br />
Superpave 12.5FC 2 R: means RMA that meets the requirements <strong>of</strong> Superpave 12.5FC 2 and contains RAC that<br />
is produced using wet process-terminal blend.<br />
Superpave 9.5 R-Gap Graded: means RMA with gap-graded aggregates having 9.5 mm nominal maximum<br />
size and contains RAC produced using the wet process-field blend. Requirements for Superpave 9.5 R-Gap<br />
Graded are specified in this special provision.<br />
Transition Area: means the length <strong>of</strong> the section within which the change from one section to the next shall be<br />
fully accomplished.<br />
1151.04 DESIGN AND SUBMISSION REQUIREMENTS<br />
1151.04.01 Design Requirements<br />
Subsection 1151.04.01 <strong>of</strong> OPSS 1151 is amended by the addition <strong>of</strong> the following:<br />
1151.04.01.07 <strong>Rubber</strong> <strong>Modified</strong> <strong>Asphalt</strong><br />
The RMA mix designs shall be according to the respective Superpave mix type specified in addition to including<br />
CR using the process specified in Table R1 and according to the following:<br />
a) Wet Process-Terminal Blend<br />
The mix shall be designed to incorporate RAC in place <strong>of</strong> PGAC. Wet process-terminal blend RAC shall be<br />
produced by the PGAC supplier at their asphalt terminal.<br />
b) Wet Process-Field Blend<br />
The mix shall be designed to incorporate RAC in place <strong>of</strong> PGAC. Wet process-field blend RAC shall be<br />
produced at the hot mix asphalt plant using a field blending plant.<br />
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