b.
Taut stringline set to grade.
c.
Short ski or shoe for joint matching.
d.
Laser control.
1.9
ROLLERS
Rollers shall be in good condition and shall be operated at slow speeds to
avoid displacement of the asphalt mixture. The number, type, and weight of
rollers shall be sufficient to compact the mixture to the required density
while it is still in a workable condition. Equipment which causes
excessive crushing of the aggregate shall not be used.
1.10
WEATHER LIMITATIONS
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NOTE: The temperature requirements in Table 1 are
included to avoid problems with the Contractor
achieving density because the mix cools too fast.
Waivers to these requirements, for isolated
incidences during production, are applicable if the
density requirements are still met.
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The hot-mix asphalt shall not be placed upon a wet surface or when the
surface temperature of the underlying course is less than specified in
Table 1. The temperature requirements may be waived by the Contracting
OfficerEngineer, if requested; however, all other requirements, including
compaction, shall be met.
Table 1.
Surface Temperature Limitations of Underlying Course
Mat Thickness, mm
Degrees C
75 or greater
4
Less than 75
7
Table 1.
Surface Temperature Limitations of Underlying Course
Mat Thickness, inches
Degrees F
3 or greater
40
Less than 3
45
PART 2
PRODUCTS
2.1
AGGREGATES
Aggregates shall consist of crushed stone, crushed gravel, crushed slag,
screenings, natural sand and mineral filler, as required. The portion of
material retained on the 4.75 mm No. 4 sieve is coarse aggregate. The
portion of material passing the 4.75 mm No. 4 sieve and retained on the
0.075 mm No. 200 sieve is fine aggregate. The portion passing the 0.075 mm
No. 200 sieve is defined as mineral filler. All aggregate test results and
samples shall be submitted to the Contracting OfficerEngineer at least 14
SECTION 02749
Page 11
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