What is PG grade in asphalt?
Superpave performance grading (PG) is based on the idea that an HMA asphalt binder’s properties should be related to the conditions under which it is used. For asphalt binders, this involves expected climatic conditions as well as aging considerations.
What binder is used in asphalt?
Typical asphalt binders used in the U.S. are AC-10, AC-20, AC-30, AR-4000 and AR-8000. Viscosity grading is a better grading system but it does not test low temperature asphalt binder rheology.
What is the lower temperature limit for asphalt binder that is PG 64 28?
The COUNTY may not waive the above temperature limitations for PG 76-28. The mixture shall not be placed at a temperature lower than 245 °F for mixes containing PG 58-28 or PG 64-28 asphalt, and 290 °F for mixes containing polymer modified asphalt.
What is PG grade?
Performance Grade (PG) Bitumen Nomenclature The PG grading system is defined by two numbers, which represent pavement temperatures. The first number PG 64-XX represents the high pavement temperature in degrees Celsius, while the second number PG XX-22 represents the low pavement temperature.
What are bituminous binders?
Paving grade bitumen is neat or unmodified bitumen which is mostly used in the production of asphalt paving materials. Other types of bituminous binders include hard paving grade bitumens, polymer-modified bitumens, bitumen emulsions, oxidised and industrial grade binders, cutback and fluxed bitumens.
What is pavement binder?
The binder, which is sometimes called the base coat, is a load-bearing course consisting of aggregate and hot-mix asphalt. Like the aggregate base, the depth of the binder depends on the use to which the pavement will be subjected.
What grade PG is needed for 98 reliability?
The common minimum reliability used is 98%, so that means when the PG 64-10 binder is selected, the asphalt binder in the AC pavement should perform satisfactorily under normal traffic condition at the location where the extreme pavement temperature are within the range of −10°C and 64°C throughout its service life …
What is a PG binder?
The Performance Graded (PG) system is a method of measuring asphalt binder performance. It was originally developed during the Strategic Highway Research Program (SHRP) in the early 1990s. In 2005, California agreed to adopt the PG system for grading asphalts in the state.
How are asphalt binders selected for the PG system?
PG asphalt binders are selected to meet expected climatic conditions as well as aging considerations with a certain level of reliability. Therefore, the PG system uses a common set of tests to measure physical properties of the binder that can be directly related to field performance of the pavement at extreme temperatures.
What kind of material is asphalt binder made of?
Asphalt Binder “A dark brown to black cementatious material in which the predominating constituents are bitumens which occur in nature or are obtained in petroleum processing.” –ASTM D8 The glue that binds the aggregate together and waterproofs the pavement.
When was the performance graded binder system created?
The Performance Graded (PG) system is a method of measuring asphalt binder performance. It was originally developed during the Strategic Highway Research Program (SHRP) in the early 1990s. In 2005, California agreed to adopt the PG system for grading asphalts in the state.
What is the PG specification for asphalt grading?
The PG specification (e.g., PG 58-22) just determines the temperature at which the tests are run. Tests are run on the original binder (no simulated aging), RTFO residue (simulated short-term aging) and PAV residue (simulated long-term aging) in order to fully characterize the asphalt binder throughout its life.