401— Asphalt Pavement

400-1 Division 400

ASPHALT PAVEMENTS 401.1 Description 1 Construct an asphalt pavement on a prepared foundation . 2 Perform milling, surface planing, and full depth patching of asphalt pavement . 401.2 Materials 401.2.1 Binder and Additives 401.2.1.1 Performance Graded (PG) Binder 1 Use PG 64- 22 or PG 76- 22 binder that conforms to AASHTO M 320. Do not use any combination of air blown asphalt binders. Ensure that the asphalt binder supplier lists all types of modifiers and additives used in the production of the PG binders , including the source of : • Re-refined engine oil bottoms (REOB) , • Polymers , • Ground tire rubber (GTR) , • Polyphosphoric acid (PPA) , • Silicone , and • Liquid anti -stripping agent (LASA) . 2 Ensure that the additives used for compaction aides or anti -strips , such as silicones, warm mix asphalt (WMA) additives, and LASA products , are listed on the Bill of Lading (BOL). Use PG asphalt binders and modifiers that are heat and storage stable. Blend the composite materials at the asphalt terminal before being loaded into the transport vehicle. Asphalt terminals that either supply or produce PG binders must be able to store multiple tanker loads of PG , and, before transferring or shipping, certify on the BOL that the products meet AASHTO M 320 and that all modifiers and additives are compatible. Only use PG 64 -22 and PG 76- 22 binder from sources listed on Qualified Product s List 37. 401.2.1.2 Modified Performance Graded Binder 401.2.1.2.1 General 1 When specified, use modified binder consisting of a neat binder modified with a polymer or other modifier producing a binder that compl ies with PG 76- 22 as specified in AASHTO M 320 with the addition of the Multiple Stress Creep Recovery (MSCR) test using AASHTO T 350. Ensure that acceptable