Holding The Contractor to
105% of the Target Spread
Rate!
3-1
330-2.2 Minimum Process Control Testing
Requirements:
5. Monitor the mix spread rate at the beginning of each day’s
production, and as needed to control the operations, at a
minimum of once per 200 tons placed to ensure that the spread
rate is within 5% of the target spread rate. When determining
the spread rate, use an average of five truckloads of mix.
If the Contractor fails to maintain the construction
process in accordance with the quality control requirements
herein stated, the Engineer may elect to stop the construction
operation at any time until the deficiencies are corrected.
3-2
334-7 Method of Measurement.
334-7 Method of Measurement.
For the work specified under this Section (including the
pertinent provisions of Sections 320 and 330), the quantity to
be paid for will be the weight of the mixture, in tons. The pay
quantity will be based on the project average spread rate,
excluding overbuild, limited to a maximum of 105% of the
spread rate determined in accordance with 334-1.4 or as set
by the Engineer. The project average spread rate is
calculated by totaling the arithmetic mean of the average
daily spread rate values for each layer.
3-3
337-11 Method of Measurement.
337-11 Method of Measurement.
For the work specified under this Section (including the
pertinent provisions of Sections 320 and 330), the quantity to
be paid for will be the weight of the mixture, in tons. The pay
quantity will be based on the project average spread rate,
limited to a maximum of 105% of the spread rate determined
in accordance with 337-8 or as set by the Engineer. The
project average spread rate is calculated by totaling the
arithmetic mean of the average daily spread rate values
for each layer.
3-4
We are not doing Arithmetic Mean but we
are holding the Contractor to 105% of the
set target spread rate and making a line item
deduction for any tonnage over 105% of
target spread rate, after the pay item is
complete!
The Certification of Quantities do not need
be corrected, but Fuel and Bit. will need to
reflect final pay.
3-5
Section 334 and 337
Superpave Asphalt, Structural and FC Close Grade
Example: Check of 105% of set Spread Rate
Typical Section = 4.5”
Design Mixes : A=2.540, B=2.489, C=2.489 and D=2.521
Design Mix
Tons Placed
Design Mix A
1176.66 ton/3625.35 =
Design Mix B
1212.97 ton/3625.35 =
Design Mix C
617.36 ton/3625.35 =
Design Mix D
618.36 ton/3625.35 =
Total Mix Placed = 3625.4 ton
%
.325
.335
.170
.171
x
x
x
x
Final Square Yards = 13,928
Final Tons = 3,625.4 @ $102.08
gmm’s
Pro-rated gmm
Gmm 2.540
=
0.826
Gmm 2.489
=
0.841
Gmm 2.489
=
0.423
Gmm 2.521
=
0.431
Prorated Gmm = (.826) + (.841) + (.423) + (.431) = 2.521
2.521 x 43.3 x 4.5” = 491 target spread rate x 1.05 = 515.55 #/sy Max
2.521 x 43.3 x 4.5” = 491 target spread rate x 0.95 = 466.66 #/sy Min
13,928 square yards x 515.55 / 2000 = 3590.29 Tons = 3590.3 Tons MAXIMUM PAY
Amount placed = 3625.4 – Max allowed 3590.3 tons = -35.1 tons deduct
-35.1 x $102.08 = -$ 3,583.01.
Add Line Item Adjustment!!
3-6