A lot shall be that quantity of construction that will be evaluated for
compliance with specification requirements for payment. A lot shall be
equal to [[_____] metric tons tons] [[_____] hours production]. When a lot
of material fails to meet the specifications requirements, that lot shall
be removed and replaced or accepted at a reduced price. The lowest
computed percent payment determined for gradation, asphalt content, and
smoothness discussed below shall be the actual percent payment for the PFC
mixture in that lot. The actual percent payment is applied to the bid
price for PFC mixture to determine actual payment. No such adjustments in
payment will be made to the bid price for bituminous material (asphalt
cement). In order to evaluate aggregate gradation and asphalt content,
each lot shall be divided into four equal sublots. One random sample shall
be taken from loaded trucks or other selected locations for each sublot of
plant-produced material. Prior to placing the material, test samples of
the mixture shall be taken for aggregate gradation determination and
asphalt content. Each random sample shall weigh at least 1 kg 2.2 pounds.
The asphalt content of these samples shall be determined by ASTM D 2172,
Method A or B. Gradation shall be determined on the recovered aggregate
according to ASTM C 117 and ASTM C 136.
3.10.1
Aggregate Gradation
The mean absolute deviation of the four sublot aggregate gradations from
the JMF for each sieve size shall be determined and compared with TABLE
III. The computed percent payment based on aggregate gradation will be the
lowest value determined for any sieve size shown in TABLE III. All tests
for aggregate gradation shall be completed and reported within 24 hours
after completion of construction of each lot.
-----------------------------------------------------------------------------
EXAMPLE
The computation of mean absolute deviation and percent payment for aggregate
gradation is illustrated below for a typical series of gradation tests.
Assume the following JMF and sublot test results for aggregate gradation.
Percent by Weight Passing Sieves
Sieve
Test
Test
Test
Test
Size
JMF
No. 1
No. 2
No. 3
No. 4
____
___
_____
_____
_____
_____
19.0
mm
100
100
100
100
100
12.5
mm
88
87
88
90
88
9.5
mm
60
57
62
63
59
4.74
mm
35
31
36
38
33
2.36
mm
15
12
18
19
14
0.60
mm
8
5
11
12
7
0.075
mm
4
2
5
6
4
Percent by Weight Passing Sieves
Sieve
Test
Test
Test
Test
Size
JMF
No. 1
No. 2
No. 3
No. 4
____
___
_____
_____
_____
_____
3/4 inch
100
100
100
100
100
1/2 inch
88
87
88
90
88
3/8 inch
60
57
62
63
59
SECTION 02747
Page 21
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