3.10.3.1
Asphalt Content
A minimum of two tests to determine asphalt content will be performed per
lot (a lot is defined in paragraph MATERIAL ACCEPTANCE AND PERCENT PAYMENT)
by one of the following methods: extraction method in accordance with ASTM
D 2172, Method A or B, the ignition method in accordance with the AASHTO T
308, ASTM D 6307, or the nuclear method in accordance with ASTM D 4125,
provided each method is calibrated for the specific mix being used. For
the extraction method, the weight of ash, as described in ASTM D 2172,
shall be determined as part of the first extraction test performed at the
beginning of plant production; and as part of every tenth extraction test
performed thereafter, for the duration of plant production. The last
weight of ash value obtained shall be used in the calculation of the
asphalt content for the mixture.
3.10.3.2
Aggregate Gradation and Specific Gravity
Aggregate gradations shall be determined a minimum of twice per lot from
mechanical analysis of recovered aggregate in accordance with ASTM D 5444
or ASTM D 6307. For batch plants, aggregates shall be tested in accordance
with ASTM C 136 using actual batch weights to determine the combined
aggregate gradation of the mixture. The specifc gravity of each aggregate
size grouping shall be determined for each 18,000 metric tons 20,000 tons
in accordance with ASTM C 127 or ASTM C 128.
3.10.3.3
Temperatures
Temperatures shall be checked at least four times per lot, at necessary
locations, to determine the temperature at the dryer, the asphalt cement in
the storage tank, the asphalt mixture at the plant, and the asphalt mixture
at the job site.
3.10.3.4
Aggregate Moisture
The moisture content of aggregate used for production shall be determined a
minimum of once per lot in accordance with ASTM C 566.
3.10.3.5
Moisture Content of Mixture
The moisture content of the mixture shall be determined at least once per
lot in accordance with ASTM D 1461 or an approved alternate procedure.
3.10.3.6
Laboratory Air Voids, Marshall Stability and Flow
Mixture samples shall be taken at least four times per lot and compacted
into specimens, using [50] [75] blows per side with the Marshall hand-held
hammer as described in ASTM D 6926. After compaction, the laboratory air
voids of each specimen shall be determined, as well as the Marshall
stability and flow, as described in ASTM D 6927.
3.10.3.7
In-Place Density
The Contractor shall conduct any necessary testing to ensure the specified
density is achieved. A nuclear gauge may be used to monitor pavement
density in accordance with ASTM D 2950.
SECTION 02749
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