The primary difference between ordinary graded binder and performance graded binder is given in the following table:

simple graded binders

performance graded binders

Binders are classified on the basis of either penetration or viscosity. Binders are graded based on the temperature of the pavement, which is close to the service conditions of the pavement
Binders are classified on the basis of tests performed only at a particular critical test temperature Binders are classified based on different ranges of pavement temperatures, similar to field conditions
Past experience, empirical and semi-empirical test results are used Purely scientific and performance based studies are considered
Hardening and aging due to storage, mixing, spraying, exposure and oxidation are not considered Hardening and aging during storage, mixing, spraying, exposure and oxidation are simulated by conducting RTFO and PAV tests
The properties of the binder are not considered at the minimum pavement temperature. The binder’s sensitivity to low temperatures is carefully assessed by conducting BBR and DT tests
The characteristics of fluency and workability are not considered during mixing of the binder. The flow, workability and viscosity properties of the binder are determined at high temperatures using
Visco-elastic properties are not given much consideration. Visco-elastic properties are determined using DSR.
There is no concept of aging of bitumen. Accelerated aging of binder up to 7 – 10 years is simulated using PAV test
An appropriate binder is selected using values ​​based on penetration, viscosity, softening point and location. The final selection of the appropriate grade of binder is made after considering the construction site location, maximum and minimum design temperatures, the design speed of the vehicles and the number of equivalent standard axle load repetitions.

Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at ProCivilEngineer.com Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.