6-32 Payment will be made under:
Pay Item Pay Unit Asphalt Concrete Base Course, Type B25.0C Ton Asphalt Concrete Intermediate Course, Type I19.0C Ton Asphalt Concrete Surface Course, Type S4.75A Ton Asphalt Concrete Surface Course, Type S9.5B Ton Asphalt Concrete Surface Course, Type S9.5C Ton Asphalt Concrete Surface Course, Type S9.5D Ton
620-1 Description
Perform the work covered by this section including, but not limited to , furnishing of asphalt binder, with anti -strip additive when required, at an asphalt plant and incorporating the asphalt binder and anti -strip additive into the asphalt plant mix.
620-2 Materials
Refer to Division 10. Item Section Anti-strip Additive s 1020 -8 Asphalt Binder, All Grades 1020 -2 Silicone 1020 -9 The asphalt binder for the mixture will be accepted at the source subject to Article 1020 -1. Use additives from the NCDOT APL . Submit a sample and manufacturer's data to the Engineer for approval before use, if proposing to use a brand not on the NCDOT APL .
620-3 General Requirements
The requirements of Section 610 that pertain to handling of asphalt binder will be applicable to the work covered by this section. Add silicone to all asphalt binder used in surface courses and open- graded asphalt friction course, unless otherwise dire cted by the Engineer . The amount of silicone added will range from one ounce per 2,000 gal of asphalt binder to one ounce per 2,500 gal. Add silicone to the asphalt binder at the plant site unless added at the source and it is so noted on the delivery ticket. Do not heat the asphalt binder to a temperature in excess of the supplier’s recommendation while stored or when being used in production of mix at the asphalt plant. Introduce the actual quantity of asphalt binder at the established percentage shown on the applicable JMF into the mix by the plant weighing or metering system. No working tolerance for asphalt binder percentage will be allowed during production. When required, incorporate an anti -strip additive. It may be either chemical additive mixed with the asphalt binder or hydrated lime added to the aggregate or a combination of both. Furnish the brand name of the type (lime or chemical), supplier and shipping point of anti-strip additive. Note on the asphalt binder delivery ticket the rate (or quantity), brand of chemical additive when added at the supplier’s terminal. Introduce and mix chemical anti - strip additive into the asphalt binder at either the supplier's terminal or at the asphalt plant site at the dosage required by the JMF. Use in- line blending equipment at either location. When added at the asphalt plant, use equipment that meets Sections 5 and 6 of the Asphalt QMS Manual . When added at the supplier's terminal, use equipment that in -line blends with a constant flow of the additive for a minimum of 80% of the asphalt binder loading time. When
6-33 hydrated lime is used, use equipment to introduce the lime that meets Sections 5 and 6 of the
Asphalt QMS Manual . Thoroughly mix chemical anti -strip additive and asphalt binder together before incorporating into the asphalt plant mix.
620-4 Measurement and Payment
Asph alt Binder for Plant Mix and Polymer Modified Asphalt Binder for Plant Mix will be measured and paid as the theoretical number of tons required by the applicable JMF based on the actual number of tons of plant mix completed and accepted on the job. Such pr ice and payment will be full compensation for all work covered by this section. There will be no direct payment for anti -strip additive. Payment at the contract unit prices for the various asphalt plant mix items will be full compensation for the work. Adjustments will be made to the payments due the Contractor for each grade of asphalt binder when it has been determined that the monthly average terminal F.O.B. Selling Price of asphalt binder, Grade PG 64- 22, has fluctuated from the Base Price Index for As phalt Binder included in the contract. The methods for calculating a base price index, for calculating the monthly average terminal F.O.B. selling price and for determining the terminals used are in accordance with procedures on file with the Construction Unit. When it is determined that the monthly selling price of asphalt binder on the first business day of the calendar month during which the last day of the partial payment period occurs varies either upward or downward from the base price index, the contract unit price for asphalt binder for plant mix will be adjusted. The adjusted contract unit price will be determined by adding the difference between the selling price and the base price index to the contract unit bid price for asphalt binder. The adju sted contract unit price will then be applied to the theoretical quantity of asphalt binder authorized for use in the plant mix placed during the partial payment period involved, except that where recycled plant mix is used, the adjusted unit price will be applied only to the theoretical number of tons of additional asphalt binder materials required by the JMF . Adjusted contract unit prices for all grades of asphalt binder, including additional asphalt binder materials in recycled mixtures, will be based on the average selling price and base price index for asphalt binder, Grade PG 64- 22, regardless of the actual grade required by the JMF. In determining the adjusted contract unit price for any material specified in this section the following formula will be used: A = B + (D – C) Where : A = Adjusted Contract Unit Price B = Contract Unit Price C = Base Price Index D = Monthly Average Terminal F.O.B. Selling Price In the event the Department is unable to secure an F.O.B. selling price from at least 4 terminals in a given month, payment will be at the contract unit price for each ton of asphalt binder used in the work during that month. Payment will be made under: Pay Item Pay Unit Asphalt Binder for Plant Mix Ton Polymer Modified Asphalt Binder for Plant Mix Ton