Marshall mix design primarily address the determination of asphalt binder content, while
Superpave addresses all element of mix design
. The Marshall design/construction method requires in most cases compaction 95% or greater of the maximum lab value.
What is Superpave method?
The Superpave mix design method was designed to replace the Hveem and Marshall methods. … The Superpave system
ties asphalt binder and aggregate selection into the mix design
process, and considers traffic and climate as well.
What is the difference between Superpave and Marshall?
Marshall mix design primarily address the determination of asphalt binder content, while
Superpave addresses all element of mix design
. The Marshall design/construction method requires in most cases compaction 95% or greater of the maximum lab value.
What is Superpave testing?
Overview. The Superpave Shear Tester (SST) (Figure 1) is
used to characterize a HMA mixture’s resistance to permanent deformation (rut resistance)
. This characterization can be used as a performance test for HMA mixtures designed using Superpave mix design or other mix design procedures.
What is Superpave binder?
Rather than a specific process or procedure, Superpave is
a performance-based specification for asphalt binder and volumetric mixture design
. … A design system grounded in traffic loading and environmental conditions. Mix design system and analysis tests for performance prediction models.
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.
What is a gyratory compactor?
This Gyratory Compactor, entirely developed and manufactured by Matest, is
used to simulate and reproduce the real compaction conditions under actual road paving operations
, hence determining the compaction properties of the asphalt. … The Compactor comprises a highly rigid steel frame ensuring excellent angle control.
What is PG grade?
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.
When was Superpave created?
After five years of intensive research and testing, SHRP introduced the Superpave system in 1992.
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 is a asphalt binder?
Asphalt BinderTM is
an anionic asphalt emulsion designed for use as a tack coat for patching, paving, and coating processes
. Asphalt BinderTM promotes adhesion of bituminous concrete products and coatings.
What is HMA test?
Performance tests are
used to relate laboratory mix design to actual field performance
. The Hveem (stabilometer) and Marshall (stability and flow) mix design methods use only one or two basic performance tests. Superpave is intended to use a better and more fundamental performance test.
Is asphalt a mixture?
Asphalt mixtures: Asphalt is
a mix of sand, gravel, broken stones, soft materials, and asphalt
. In Marshall’s Standard Test
*
for designing asphalt mixtures, it was found that the percentage of asphalt required can be reduced as the density of the mixture increases.
What is the best grade of asphalt?
The grades available are I-2, also known as base;
I-5
, known as top ;and the I-4 or commercial top grades. The difference in the tree grades are that the I-2 or base consists of 3⁄4 inches of stone. The base grade is generally used in corn stabilizing level. The I-5 or top is commonly used for homeowners and businesses.
Which property is most important for asphalt binder?
Typically, the most important physical properties are:
Durability
. Durability is a measure of how asphalt binder physical properties change with age (sometimes called age hardening). In general, as an asphalt binder ages, its viscosity increases and it becomes more stiff and brittle.
What is PG bitumen?
Performance Grade
(PG) bitumen is bitumen which is graded based on its performance at different temperatures. The LTPP has given the certain algorithm to calculate the temperature of the pavement based on the temperature of the air above.
