What does PG mean in asphalt?

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 does PG mean in grading?

Some schools create a Post Graduate (PG) Grade Level for students who may spend an extra year at the school after graduating.

What does PG 76 22 mean?

For example, a PG 76-22 is likely to be a polymer modified binder since the sum is 98, while a PG 64-10 is likely to be an unmodified since the sum is 74. Polymer modified binders used in Caltrans projects will be noted with Polymer Modified (PM), such as PG 64-28PM, or PG 76-22PM.

What does PG 58 28 mean?

The first number of the PG designation specifies the maximum design temperature; the second specifies the minimum design temperature. A PG 58-28, for example, meets the average 7-day maximum pavement design temperature of 58°C and the minimum design temperature of -28°C.

What are the grades of PG bitumen?

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.

PG Binder Grading Explained

How many grades of asphalt are there?

The common grades used in California are PG 58-22, PG 64-10, PG 64-16, PG 64-28, and PG 70-10. California expects to specify PG grades for modified binder (PG Modified) in the near future.

Which is the hardest grade of bitumen?

Bitumen pen grades include 40/50, 60/70, 80/100, 85/100. Among all grades, bitumen 85/100 is the softest, and bitumen 40/50 is the hardest one.

What is PG 64 22 in asphalt?

For example, in "PG 64-22," the "64" represents the maximum pavement temperature, in degrees Celsius, for which this binder can be used with low traffic levels. The second number, "-22," signifies the minimum temperature, in degrees Celsius, for which the binder can be used without the likelihood of failure.

What is PG 70 10 asphalt?

The performance grading of bitumen is based on the evaluation of the material performance and pavement temperatures. In Super-pave grading system, binders are classified according to their Performance in extreme hot and cold temperatures and called as Performance Grade Bitumen.

How do you determine the performance grade of asphalt?

Laboratory Testing: Determining the PG grade of asphalt binders requires laboratory testing, including tests such as the dynamic shear rheometer (DSR) and bending beam rheometer (BBR). These tests evaluate the binder's rheological properties and its response to temperature and loading conditions.

What is ac5 asphalt?

The AC grading is related to absolute viscosity at 60 c in 100 poises. Here are six asphalt cement (AC) viscosity grades: AC-2.5 (the softest grade), AC-5 (viscosity is 500 ± 100 poise at 60° C (140° F)), AC-10, AC-20, AC-30, and AC-40 (the hardest grade (viscosity is 4000 ± 800 poise at 60° C (140° F))).

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 are the different types of asphalt binders?

Types of Asphalt Binders

Some of the common types include Performance Graded (PG) binders, Viscosity Graded (VG) asphalts, and various modified binders that include polymers and other additives to enhance performance.

What is the performance grade of bitumen?

Performance Grade (PG) bitumen is bitumen which is graded based on its performance at different temperatures. The Long-Term Pavement Performance(LTPP) has given certain algorithm to calculate the temperature of the pavement based on the temperature of the air above.

What is the minimum temperature for asphalt binder?

4-9201A Performance Grade Asphalt

An asphalt binder specified as performance grade PG 64-10 has the physical properties needed for field performance of pavement at an average 7-day maximum pavement temperature of 64 degrees Celsius and at a minimum pavement temperature of -10 degrees Celsius.

What is asphalt binder used for?

In other words, it acts as the glue that holds the road together. In its most common form, asphalt binder is simply the residue from petroleum refining.

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 are the grades of asphalt in the UK?

100/150 pen bitumen is the preferred grade for most applications in the UK, although 40/60 is used for heavily trafficked roads, and 160/220 is often used for hand lay work as it is easier to apply.

Which bitumen grade is best?

Bitumen VG30 is the most widely used type of bitumen in road construction, insulation, building construction industries, and also in the production of cutback bitumen. It's better to know that this vg30 bitumen can be used instead of 60/70 penetration bitumen grade. VG 30 bitumen is a popular grade of bitumen in India.

What does 40 60 mean in asphalt?

Bitumen Penetration Grade 40/60 is a standard penetration grade Bitumen usually used as a Paving Grade Bitumen suitable for road construction and for the production of asphalt pavements with superior properties. This grade of Bitumen is mainly used in the manufacture of hot mix asphalt for bases and wearing courses.

What is rule of 92 asphalt?

The UTI “Rule of 92” gives an indication of whether a binder is modified. If the UTI is less than 92 degrees Celsius, the asphalt binder is probably not modified. Most binders with a UTI value of 92 are modified, but a few crude sources may meet the value without modification.

What grade asphalt is best for driveways?

The 41A asphalt type is a smoother surface. It is durable, but with a finer rock and sand mixture. This is what most homeowners choose for their driveways.

What is the difference between asphalt and bitumen?

Bitumen Vs. Asphalt. The terms bitumen and asphalt are often used interchangeably, but they are not the same. Bitumen is a naturally occurring material that is made up of hydrocarbons, while asphalt is a man-made product derived from bitumen.

Which is better bitumen or tar?

Difference between Bitumen and Tar

Tar melts at a higher temperature than bitumen, has more carbon than bitumen, and is a superior adhesive. However, tar is only sometimes utilized in place of bitumen while constructing roadways. Tar is used for various purposes, including skin care, coating wood, and waterproofing.

Why is bitumen better than tar?

Generally, bitumen has lower carbon content in comparison to tar but 80% to 90% of bitumen is carbon. Bitumen with a higher carbon content may be more viscous and hard, while bitumen with a lower carbon content may be less durable and more susceptible to aging and weathering.