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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supplier provides ingredients and instructions then it is the Contractor’s responsibility to identify a<br />
facility to produce the mixes. The Contractor is responsible for obtaining from the suppliers any and all<br />
information required for the proper preparation, handling, storage and use <strong>of</strong> their materials.<br />
The grade <strong>of</strong> PGAC to be used in the test sections shall a 70-28.<br />
SMA<br />
The coarse and fine aggregates used for SMA shall be crushed from the same dolomitic sandstone<br />
source.<br />
The SMA shall comply with the gradation requirements - design criteria for SMA 9.5 specified<br />
elsewhere in the contract.<br />
The Designated Large Sieve (DLS) for SMA shall the 4.75 mm sieve as specified elsewhere in the<br />
contract.<br />
OGFC<br />
The gradation <strong>of</strong> OGFC shall follow Table A below.<br />
Mix design shall be as per ASTM D7064-04 or later revision.<br />
Aggregate properties shall meet the requirement for Superpave 12.5 FC2 except that the coarse<br />
aggregate shall consist <strong>of</strong> 100% particles with minimum two crushed faces.<br />
Minimum allowable ambient temperature for paving OGFC shall be 12C. If the ambient<br />
temperature is below 18C, the hauling truck shall be covered with a sound water-repellent<br />
tarpaulin.<br />
Only steel-wheeled rollers shall be used for compaction.<br />
RAC-O<br />
The gradation <strong>of</strong> RAC-O shall follow Table A.<br />
Mix design shall be as per ASTM D7064-04 or later revision.<br />
Aggregate properties shall meet the requirement for Superpave 12.5 FC2 except that the coarse<br />
aggregate shall consist <strong>of</strong> over 90% particles with minimum two crushed faces.<br />
Minimum allowable ambient temperature for paving RAC-O shall be 12C. If the ambient<br />
temperature is below 18C, the hauling truck shall be covered with a sound water-repellent<br />
tarpaulin.<br />
Only steel-wheeled rollers shall be used for compaction. Rollers must be equipped with pads and<br />
watering system to prevent excessive pick-up.<br />
RAC-O shall be produced using either wet or semi-wet process. Dry process is not permitted in<br />
this project.<br />
Wet process shall consist <strong>of</strong> rubberized asphalt binder conforming to ASTM D6114. Preferred<br />
minimum CRM dosage by weight <strong>of</strong> asphalt binder should be 15%. For the production <strong>of</strong> the<br />
rubberized asphalt binder, parameters such as rubber gradation, mixing method and equipment,<br />
dosage, reaction time, mixing temperature, storage conditions and need for agitation, blending<br />
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