The literature review revealed that
Superpave mix design provides better performance than Marshall method
, especially for roads exposed to heavy traffic loadings and climatic changes. … This result proved the superiority of Superpave mixes over Marshall mixes.
What is the 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 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.
When was Superpave created?
After five years of intensive research and testing, SHRP introduced the Superpave system in 1992.
What is the difference between Marshall and Superpave?
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 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?
Marshall stability
measures the maximum load sustained by the bituminous material
at a loading rate of 50.8 mm/minute. The test load is increased until it reaches a maximum. … Marshall stability is related to the resistance of bituminous materials to distortion, displacement, rutting and shearing stresses.
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.
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 gyratory compaction?
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 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 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 Superpave 19?
Stone Mastic Asphalt (SMA) Hot Mix Types means SMA 9.5, 12.5, and 19.0 mixes. … Superpave means an acronym for
Superior Performing Asphalt Pavements
. It is an alternative system to the Marshall method for specifying material components and asphalt mix design using the Superpave gyratory compactor.
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.
How do you make a design for asphalt?
Mix design is a process to manipulate three variables: (1) aggregate, (2)
asphalt binder
content and (3) the ratio of aggregate to asphalt binder with the objective of obtaining an HMA that is deformation resistant, fatigue resistant, low temperature crack resistant, durable, moisture damage resistant, skid resistant …
