What is elastic recovery test of bitumen?

The elastic recovery is measured by the percentage to which the asphalt cement residue will recover its original length after it has been elongated to a specific distance at a specified rate of speed and then cut in half.

Why is elastic recovery important?

Elastic Recovery (ER) is used by many highway agencies for modified bitumen grading specifications. The current ASTM/AASHTO standards for ER testing utilize the ductility bath as the measurement apparatus. The results show a good correlation between the ER-DSR and ER measured in the ductility bath (ER-DB).

What is elastic recovery?

Elastic recovery, or resilience, is a measure of the ability of an elastomer to return to its original shape when a compression load is removed.

What is ductility test of bitumen?

property of bitumen which allows it to undergo deformation or elongation is called ductility of bitumen. The ductility of bitumen is measured by the distance in Cm (centimeter), to which the bitumen sample will elongate before breaking when it is pulled by standard specimen at specified speed and temperature.

How do you calculate elastic recovery?

Elastic Recovery After a load is released from a stress-strain test, some of the total deformation is recovered as elastic deformation. The recovered strain is calculated as the strain at unloading minus the strain after the load is totally released.

What is high elastic recovery?

The high elastic recovery up to 94 per cent and high range of predominantly elastic deformation of ≥ = 10 per cent, which results in a very high elastic energy density upon indentation, can be understood in terms of reversible flexing (Veprek and Jilek, 2002).

How is ductility test done?

A bend test helps provide a visual indication of the ductility of the material. The guided bend test method requires the specimen to be loaded at its center point with a mandrel or plunger while being supported at the ends. The specimen is bent to a predetermined angle or until the specimen fractures.

What is elastic recovery in textiles?

Elastic recovery: elastic recovery of a fabric is the ability to return in its original size and shape when the fabric comes under breaking load condition.

What is elastic recovery after plastic deformation?

Introduction; Upon release of the load during the course of a stress-strain test, some fraction of the total deformation is recovered as elastic strain.

What are the tests for bitumen?

Tests on bitumen

• Penetration test.
• Ductility test.
• Softening point test.
• Specific gravity test.
• Viscosity test.
• Flash and Fire point test.
• Float test.
• Water content test.

What is a35 grade bitumen?

Bitumen Penetration Grade 35/50 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.