TABLE I

 

Price Adjustment for Asphalt Binder

(Noncomplying Bending Beam Rheometer)

 

Tests on the Bending Beam Rheometer (BBR) will be used for acceptance testing in the District Materials Lab per IM 204 requirements. The test report for the sample(s) will show a Flexural Creep Stiffness test result expressed in dimensionless m units. This number is a check on the low temperature portion of the performance grading specification. The minimum value is 0.300 at the low test temperature, i.e.: -28o C for PG 58-28 or -22o C for PG 64-22. Since this value is the same for all grades, a single price adjustment schedule can be used for all PG asphalt binders. Based on the current precision of the BBR tests, the following table applies:

 

 

Percent

Percent

m - value

Price Adjustment

Payment *

 

0.295 or greater

0

100

0.290 to 0.294

5

95

0.285 to 0.289

10

90

0.280 to 0.284

25

75

less than 0.280 **

50

50

 

The price adjustment applies to the asphalt binder only.

 

* For HMA bid by Area:

 

(1) Percent Price Adjustment shall be applied to the Invoice Price paid for affected asphalt binder quantity, to determine the Price Adjustment amount for HMA area involved.

 

(2) If Invoice Price paid for asphalt binder is not available, payment for affected HMA area shall be based on: Percent Payment = 100 (0.5 X % Price Adjustment)

 

** Engineer may consider the lot defective.