Superpave is an acronym which stands for: Superior Performing Asphalt Pavements. Superpave is a performance-related asphalt binder and mixture specification.

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). … Results from the RSCH test are used to determine the accumulation of permanent shear strain with load repetitions.

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 the difference between Marshall mix 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 Superpave binder?

A New Approach to Asphalt Mix Design Rather than a specific process or procedure, Superpave is a performance-based specification for asphalt binder and volumetric mixture design. … A system of classifying asphalt binder based on its performance response to temperatures and aging characteristics.

What pavement distress is evaluated by the Superpave testing?

Using the Superpave system, materials and mixes can be designed to reliably perform under any conditions of load and environment. It evaluates the binders’ abilities in resisting rutting, fatigue and low temperature cracking based on their rheological properties at the anticipated pavement temperatures.

What is Superpave 19?

Superpave 19.0 Binder course mix for Traffic Category A, B, C, D, and E roads. Superpave 19.0 is similar to the traditional HL 4, HL 8, and (HS) HL 8 mixes according to OPSS 1150. Superpave 25.0 Large stone binder course mixes for use when thicker binder course lifts are required.

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 …

How does the Superpave binder specification related to performance?

SHRP research developed the Superpave binder specification to be generic, performance based and climate driven. It addresses the pavement distresses of rutting, fatigue, and thermal cracking. Complete testing requires a lengthy process in person-hours and elapsed time.

When was Superpave created?

After five years of intensive research and testing, SHRP introduced the Superpave system in 1992.

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What is dust to binder ratio?

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 does Rice mean in asphalt?

The Rice Test for Specific Gravity of Asphalt is a common test that measures the Theoretical Maximum Specific Gravity (Gmm) of asphalt specimens. The test is an integral part of the quality assurance of asphalt mixtures. Free and entrapped air is removed from the asphalt sample to prepare for the test.

What is PG grade?

The Performance Grade (PG) system is the method of categorizing an asphalt cement binder. used in asphalt pavement relative to its rated performance at different temperatures.

What is Marshall mix design?

The Marshall Mix Design method was originally developed by Bruce Marshall of the Mississippi Highway Department in 1939. The main idea of the Marshall Mix Design method involves the selection of the asphalt binder content with a suitable density which satisfies minimum stability and range of flow values.

What is the best grade of asphalt?

The 60-70 grade is usually used only in pavements where traffic is very heavy such as principle city streets and very heavily trafficked rural highways. The second grade, 85-100, is by far the most widely used material for plant mixes and is suitable for most pavements.

What is Aashto m320?

AASHTO M 320, 2021 Edition, 2021 – Standard Specification for Performance-Graded Asphalt Binder. This specification covers asphalt binders graded by performance. Grading designations are related to the average seven-day maximum pavement design temperature and the minimum pavement design temperature.

What is 19mm asphalt?

Asphalt Paving ‐ 19mm Binder Course 19mm Binder Course is applied in one layer, is as strong as regular base and has a sufficient amount of liquid asphalt to roll into a very durable surface. The difference is that the texture is coarser than 9.5mm Wearing Course.

What is the Superpave 12.5 FC2?

Superpave 12.5 FC2 Surface course mix for use on Traffic Category D and E roads that provides superior rutting resistance and skid resistance through aggregate selection. Superpave 12.5 FC2 is similar to the traditional DFC mix according to OPSS 1150.

What is HL8 asphalt?

Driveway Paving, Commercial Patching & More HL3 – This commercial grade asphalt is used in situations where a more durable surface is needed. HL8 – Base asphalt is used for multi layered applications.

What's the density of asphalt?

Standard density for asphalt is 145 lb/ft3 (2322 kg/m3). Multiply the volume by the density (in the same units) to get the weight.

What pg64 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 PG in pavement?

General Description of Performance Grade (PG) Bitumen Performance Grade (PG) Bitumen is bitumen which is graded based on its performance at different temperatures. … From this, the highest and the lowest temperatures of the pavement are calculated and the bitumen that performs well in that temperature range is selected.

How are performance graded asphalt named?

Performance Grade Nomenclature Superpave performance grading is reported using two numbers – the first being the average seven-day maximum pavement temperature (°C) and the second being the minimum pavement design temperature likely to be experienced (°C).

How do you measure viscosity of bitumen?

To determine the industrial viscosity of bitumen, road tar, and cutback bitumens. The industrial viscosity of bitumen is measured by determining the time taken by 50 cm3 volume of material to flow from a cup through a specified orifice in standard conditions of temperature and a specified temperature.

How do you calculate PG grade of asphalt?

PG system is based on project climate. The standard notation for PG binder is PG XX-YY where XX is the average-seven day maximum pavement design temperature and YY is the minimum pavement design temperature.

What are the different methods used to grade asphalt binders?

Three different asphalt grading systems are normally used; they are penetration grading system, viscosity grading system and performance grading (PG) systems.

What is the binder in asphalt?

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 grades of asphalt?

There are three different grades available in 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 ¾ inches of stone. The base grade is generally used in corn stabilizing level.

What is a binder coat?

The binder, which is sometimes called the base coat, is a load-bearing course consisting of aggregate and hot-mix asphalt. Because the binder must be strong, it typically contains aggregates that are approximately 0.75 inch in size.

What is pavement interactive?

Pavement Interactive is a free online knowledge base for the paving industry. The site is a repository for encyclopedic articles, news, and information on all topics related to pavements. It serves as a resource for contractors, government agencies, consultants, and others in the transportation infrastructure industry.

How does asphalt binder change with temperature?

Thus, asphalt binders may tend to become stiff and brittle at low temperatures, a thick viscous fluid at high temperatures, and a semi-solid at intermediate temperatures. … At the same time, some of the chemical compounds making up asphalt binders can oxidize, which can also result in an increase in stiffness.