2010 Construction and Material Specifications - Ohio Department of ...

2. Shot content (ASTM C612)
Passing No. 60 (250 µm) sieve: 90 - 100%
Passing No. 230 (63 µm) sieve: 65 - 100%
3. Degradation (max)*: 30%
443.04
* (GeorgiaDOT-124/McNett ) - copy available from the Office of Materials
Management, Asphalt section.
443.04 Mixing. Conform to the following additional requirements.
A. Fiber Stabilizer. Furnish feeder equipment specifically manufactured to
uniformly feed fiber into the plant and that is automated through connection with
plant controls. Include a low level and no-flow indicator and print out the feed rate
of the feeder supply system and include a transparent pipe section for observing
flow consistency. The Engineer will approve the fiber feed system by a trial load
of SMA and inspection of the bag house collected material prior to the start of
production. Conduct and document a weekly quick check of the fiber feed
calibration according to the Quality Control Plan. Conduct a daily check of fiber
usage by calculating and documenting on the TE 199 that fiber usage is within
10% of the intended usage.
In drum plants, add the fibers in loose form, by an automated calibrated feed
system, such that the fibers are coated by asphalt binder before being caught in the
drum air flow.
In batch plants, distribute the fiber uniformly before injecting asphalt binder and
increase mixing time a minimum of 5 seconds.
B. Mineral Filler. Filler may be fed through a hopper if consistency of flow is
achieved. If a problem in feeding consistency occurs a pneumatic system will be
required. Feed filler into the weigh hopper or pug mill of a batch plant, or at a
point away from the flame on a drum plant.
443.05 Storage. Do not store the SMA at the plant for more than 2 hours. Do
not exceed a mix temperature of 350 ºF (180 ºC). Provide SMA at a minimum of
300 ºF (148 ºC) when it arrives at the paver, unless otherwise approved by the
Laboratory. If draindown occurs shorten the storage time and increase the fiber
dosage.
443.06 Quality Control. Ensure an employee of the Contractor with a Level 3
rating is at the plant or construction site during production of the SMA for any test
strips and through at least one full production day satisfactory to the District.
Perform quality control tests every 3 hours of production. The increased
frequency of quality control testing may require additional quality control
personnel at the plant. Determine the asphalt binder content, gradation, moisture
content, air voids, VMA, and MSG of the SMA. For each test series calculate the
VCAMIX / VCADRC. If the limit of 1.0 is exceeded stop production until
resolved. Perform a draindown test once each day of production and raise fiber
dosage 0.1% if the test limit is exceeded. Do not exceed the No. 200 (75 µm)
sieve design bands by the moving average of three tests. Compact specimens at
300 ºF (149 ºC) for PG 70-22M and 310 ºF (154 ºC) for PG 76-22M. Due to
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