the joint is expressed as a percentage of the total lot area. A weighted
pay factor for the joint is determined based on this percentage (see
example below). The pay factor for mat density and the weighted pay factor
for joint density is compared and the lowest selected. This selected pay
factor is the pay factor based on density for the lot. When the TMD on
both sides of a longitudinal joint is different, the average of these two
TMD will be used as the TMD needed to calculate the percent joint density.
All density results for a lot will be completed and reported within 24
hours after the construction of that lot.
Table 8.
Pay Factor Based on In-place Density
Average Mat Density
Average Joint Density
(4 Cores)
Pay Factor, %
(4 Cores)
--------------------------------------------------------------------
94.0 - 96.0
100.0
Above 92.5
93.9
100.0
92.4
93.8 or 96.1
99.9
92.3
93.7
99.8
92.2
93.6 or 96.2
99.6
92.1
93.5
99.4
92.0
93.4 or 96.3
99.1
91.9
93.3
98.7
91.8
93.2 or 96.4
98.3
91.7
93.1
97.8
91.6
93.0 or 96.5
97.3
91.5
92.9
96.3
91.4
92.8 or 96.6
94.1
91.3
92.7
92.2
91.2
92.6 or 96.7
90.3
91.1
92.5
87.9
91.0
92.4 or 96.8
85.7
90.9
92.3
83.3
90.8
92.2 or 96.9
80.6
90.7
92.1
78.0
90.6
92.0 or 97.0
75.0
90.5
below 92.0, above 97.0
0.0 (reject)
below 90.5
3.11.6.3
Pay Factor Based on In-place Density
An example of the computation of a pay factor (in I-P units only) based on
in-place density, is as follows: Assume the following test results for
field density made on the lot: (1) Average mat density = 93.2 percent (of
lab TMD). (2) Average joint density = 91.5 percent (of lab TMD). (3)
Total area of lot = 30,000 square feet. (4) Length of completed
longitudinal construction joint = 2000 feet.
a. Step 1: Determine pay factor based on mat density and on joint
density, using Table 8:
Mat density of 93.2 percent = 98.3 pay factor.
Joint density of 91.5 percent = 97.3 pay factor.
b. Step 2: Determine ratio of joint area (length of longitudinal
joint x 10 ft) to mat area (total paved area in the lot): Multiply the
length of completed longitudinal construction joint by the specified 10
ft. width and divide by the mat area (total paved area in the lot).
SECTION 02749
Page 33
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