Forestry and Environment Sympoisum 2002, Sri Lanka

Monday, September 18, 2006

FUTURE OF BITUMEN EMULSION AS-AN ENVIORNMENTAL FRIENDLY ROAD CONSTRUCTION MATERIAL

H.L.D.M.A. Judith & J.M.S.J.Bandara
Department of Civil Engineering, University of Moratuwa.


Bitumen emulsion is a thermodynamically unstable- heterogeneous system in which finely ground bitumen particles are dispersed in an aqueous medium. In most parts of the world usage of bitumen emulsion as a road construction material has increased during the recent past partially replacing penetration grade bitumen (tar) and cutback bitumen due to environmental reasons. In Sri Lanka bitumen emulsion is used for certain road construction work. However, still there is somewhat reluctance among road engineers to use bitumen emulsion as a substitute for other types.

There are numerous uses for bitumen emulsion utilizing highly varied techniques, which results in several different formulations; namely cationic and anionic depending on particle charges and rapid setting, medium setting and slow setting depending on its speed of separation of bitumen from aqueous medium. In Sri Lanka, cationic type bitumen emulsion is used, as majority of the available local aggregates are acidic except Jaffna limestone.

Bitumen emulsion is suitable to the requirements of all road maintenance work. Ease of storage and transport make it possible to set up numerous depots and its ease and facility of use enable work to be done quickly causing minimum disturbance to the users. It may be the first choice bituminous material for all maintenance work on road pavements due to environmental friendliness, provided that correct proportions and standard specifications are being used.

Bitumen emulsion has proven itself as a binder, which utilizes very low energy consumption in road maintenance and laying of surface dressings. Penetration grade bitumen requires heating at construction sites, which emit smoke with chemicals and also it needs fuel, which is a non-renewable resource. Kerosene that is used for cutting back the viscosity of bitumen is also a non-recoverable waste when curing takes place on the road.

This paper identifies the advantages of using bitumen emulsion over other traditional alternatives and investigates the reasons for the reluctance to use locally. The paper proposes suitable remedial measures to overcome the perceived disadvantages and increase the use of bitumen emulsion as an environment friendly alternative.

3 Comments:

  • At 11:27 PM, Blogger Indrajeet said…

    Bitumen emulsion is the right choice to road construction material because
    -environment & human friendly in manufacturing,handling and in application.
    -Increasing the natural resource
    -others basic advantages

    Indrajeet Upadhyay
    GM-Emulsion & New Product Development
    Tinna Overseas ltd
    India(9910097845)

     
  • At 3:23 AM, Blogger Krishan Nagpal said…

    Bitumen emulsion supported cold mixing, consist of coating the integral in a bitumen emulsion in water.

     
  • At 12:20 AM, Blogger Robert Gillam said…

    Nice Post Thanks For sharing....... A bitumen rejuvenate that reverses the effects of oxidisation in asphalt.This is the most cost effective asphalt preservation system on the market.

     

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