Rumays Intl. Trading Co.


Modified Bitumen

A variety of additives are used for modification of Bitumen. The degree of modification depends on type of Modifier, its dose and nature of Bitumen. The most commonly used Modifiers are:

  1. Polymer Modified Bitumen (PMB)
  2. Crumb Rubber Modified Bitumen (CRMB)
  1. Polymer Modified Bitumen (PMB)

PMB meets the requirements in accordance with PMB of IS 15462 specifications designed for pavement applications. Heavy traffic intensity in terms of commercial vehicles, overloading of trucks and significant variations in daily & seasonal temperature of the pavement have been responsible for early development of distress symptoms like raveling, undulations, rutting, cracking, bleeding, shoving and potholing of bituminous surfaces.

Polymer Modified Bitumen Grades:

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Polymer Modified Bitumen Grades:

  • PMB 76-10
  • PMB 76-22
  • PMB 82-10
  • PMB 86-22

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
  • Improved adhesion between aggregate and binder
  • Improved fuel and water resistance
  • Water resistance properties are increased
  • Enhanced deformation resistance to low temperature cracking
  • Resistance to fatigue and rutting
  • Resistance to deformation at high temperature
  • Savings in total road life coasting
  • Not detrimental to basic properties of bitumen and enhances them.

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.
  1. Crumb Rubber Modified Bitumen (CRMB)

Crumb Rubber Modified Bitumen is special type of bitumen whose properties have been improved by the addition of crumb rubber & special types of additives like hydrocarbon materials, resins etc. Thus altering the physical properties of bitumen makes it more resistant to temperature variations, weather and high traffic loads, leading to enhanced pavement life, reduced maintenance cost and excellent driving comfort. CRMB can be used for wearing courses at heavy trafficked roads, busy intersections, bridge decks and roundabouts for increased life of the surfacing.