Polymer Modified Bitumen

Polymer Modified Bitumen

Polymer Modified Bitumen have binders whose properties have been modified by the use of a modifying agent which when added to the original bitumen alters its chemical structure and/or physical and mechanical properties in order to make it more resistant to temperature variations, weather and high traffic loads.

Commonly used modifying agents are polymers. depending upon the nature of the polymer, these modifiers can be classified as:

Plastomers: EVA (Ethylene Vinyl Acetate), EBA (Ethylene Butyl Acrylate), ETP (Ethylene Ter Polymer), etc.

Elastomers: SBS (Styrene-Butadiene Styrene), SIS (Styrene isoprene Styrene).

Advantages of using PMB:

Increase in softening point and decrease in the brittleness ensures more protection against hot Climatic Conditions

Increase in elastic recovery ensuring protection against the cold climatic condition

Better adhesion of the binder to the aggregate

Water resistance properties are increased

Resistance to stripping and low-temperature cracking

Resistance to fatigue and rutting

Application of PMB:

On Heavy traffic levels, curves, crossroads etc.

Where there is risk of high and low road surface temperatures

For heavy-duty applications

As Bond coats

To improve durability in remote areas

In high rainfall areas and high-stress conditions.