GTR Paving Pellets

Laboratory Procedures

Paving Pellets can be used as you would any asphalt/bitumen in asphalt hot mix concrete ........... with or without additional bitumen.

Refer to ASTM International Standard WK20240 , ASTM D6114, or ASTM D140 for mixing and sampling procedures. Review Typical Mix Designs (in pdf format).

Read the DSR use for GTR Paving Pellets. Call for specific "re-liquefaction procedures" if needed.

Manufacturer suggested use for making GTR Paving Pellet laboratory samples:

GTR Paving Pellets are used as you would any modified asphalt/bitumen in asphalt hot mix concrete with one exception.

High sheer mixing imitating the action in the mixing chamber of an asphalt hot plant is required*. Hobart can work but, we recommend a rotating metal cement mixer be heated with a 'flame-O' propane torch to 375 degrees F. (173degrees C.),

add the appropriate amount (5,000 gr.. or more) of oven heated - 350 degree F. aggregate or aggregate heated in the mixer with the 'Flame-0'

then add the desired amount of Paving Pellets (gap graded approx. 6% and OGFC approx. 9%). Test as you would any asphalt hot mix concrete.

*During actual hot mix production, the GTR pellets are metered into the mixing chamber via a RAP feeder or directly into the pug mill as any bitumen. Pellets melt within 30 to 40 seconds with agitation caused by the "ball-mill" effect of the aggregates in the mix-chamber.

To obtain higher production levels at the hot plant and still meet asphalt-rubber specs, the contractor may add 1% of local liquid bitumen to accelerate melting of the pellets and still achieve the preferred ASTM ratio of rubber to bitumen.

No added bitumen required:

If you desire to use the GTR pellets with no additional asphalt oil, add 6% to start with your reference design and make a ladder of 1% increments. You must use a gap-graded or open graded mix design. *(see typical mix designs under the typical mix design button of Lab Procedures).We typically find that 7% to 9% is standard for most limestone aggregates depending on absorbency and gradation.

As with most good asphalt binders, you will see improvement in the Superpave numbers for high temperature performance with a gain in the bottom end as well.

GTR (ground tire rubber) paving pellets: Utilize our handy excel chart for determining the various contents and percentages. Excel spreadsheet on weight vs. batch recommended. Email request to Bill@pavingpellets.com or Phil Feliz at phil.f@wt-us.com.
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