What is the Superpave method?
The Superpave system ties asphalt binder and aggregate selection into the mix design process, and considers traffic and climate as well. The compaction devices from the Hveem and Marshall procedures have been replaced by a gyratory compactor and the compaction effort in mix design is tied to expected traffic.
Is Superpave an HMA?
Superpave consists of (1) an asphalt binder specification, (2) an HMA mix design method and (3) HMA tests and performance prediction models. Each one of these components is referred to by the term “Superpave”.
What is Superpave testing?
The Superpave system consists of three interrelated elements: asphalt binder specification; volumetric mix design and analysis system; and mix analysis tests and a performance prediction system that includes computer software, weather database, and environmental and performance models. …
What is dust to binder ratio?
In the original Superpave specification, the dust-to-binder ratio was 0.6 to 1.2 by weight. During design, mixtures that are above the maximum density line at the 2.36-mm (for 19-mm or smaller mixtures) or 4.75-mm (for 25-mm or larger mixtures) critical sieve should have a dust-to-binder ratio of no more than 1.4.
What are the tests for asphalt?
Asphalt Tests
- Kinematic Viscosity. The kinematic viscosity of a liquid is the absolute (or dynamic) viscosity divided by the density of the liquid…
- Superpave Shear Tester.
- Absolute Viscosity.
- HMA Performance Tests.
- Mixture Characterization Tests.
- Flash Point.
- Asphalt Mixture Performance Test.
- Binder Content.
What is PG 64 22?
Paving Asphalt PG 64-22 is a Performance Graded (PG) asphalt derived from specially selected crude oils via carefully controlled refining processes. The quality of ExxonMobil products is assured for every delivery. Products are manufactured according to global product integrity requirements.
Why Marshall stability test is done?
The Marshall stability and flow test provides the performance prediction measure for the Marshall mix design method. The stability portion of the test measures the maximum load supported by the test specimen at a loading rate of 50.8 mm/minute.
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 asphalt binder?
In its most common form, asphalt binder is simply the residue from petroleum refining. To achieve the necessary properties for paving purposes, binder must be produced from a carefully chosen crude oil blend, and processed to an appropriate grade.
What are the components of a Superpave mix?
Superpave, in its final form consists of three basic components: An asphalt binder specification. This is the PG asphalt binder specification. A design and analysis system based on the volumetric properties of the asphalt mix. This is the Superpave mix design method. Mix analysis tests and performance prediction models.
What do you need to know about Superpave pavement grading?
These tests and specifications are specifically designed to address HMA pavement performance parameters such as rutting, fatigue cracking and thermal cracking. 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.
When did the Superpave mix analysis system start?
A design and analysis system based on the volumetric properties of the asphalt mix. This is the Superpave mix design method. Mix analysis tests and performance prediction models. This area is not yet complete. Test development and evaluation is on-going as of 2001.
When to use the ” < 58 ” column in Superpave?
For instance, if the average 7-day maximum pavement design temperature is greater than 52 o C but less than 58 o C then you should use the “< 58” column. The temperatures directly under the “< 58” cell are selected based on the minimum pavement design temperature in o C. No matter what the desired PG binder specification, the same tests are run.