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Advantage And Disadvantage Of Bitumen

1164 Words5 Pages

CHAPTER 1
INTRODUCTION

Bitumen has been used in different forms in construction and maintenance of bituminous pavement. Bitumen being a thermoplastic and a semi solid highly viscous material is not workable in all conditions. There are three ways to transform it into a workable form. Those are (a) by heating (b) by blending with petroleum solvents to form cutbacks (c) by emulsifying in water to form bitumen emulsion.
The process of heating bitumen makes it workable but it leads to many environmental problems. In these process bitumen is heated to a temperature around 150-160 degree centigrade to make it workable . This is accompanied by the emission of hydrocarbon and other pollutants resulting in degradation of the environment. This method of hot mix and hot laid type bituminous construction is sometimes not feasible and is not desirable in areas with high rainfall density as it affect production and laying of the hot mix. It is also not desirable in colder climate as the hot bitumen gets solidified and losses its binding property as soon as it comes in contact with the cold pavement surface. Cutback bitumen were given as a solution for these problems but this to requires a little heating accompanied by the emission of solvent oil used as cutter which is hazardous to the environment. This encourages the use of bitumen emulsion which can bring about both energy saving and pollution control by eliminating heating of both bitumen and aggregate. …show more content…

Bitumen is the dispersed phase and water is the continuous phase. The bitumen is dispersed throughout the water phase in the form of discrete globule of size ranging from 0.1-50 µm in diameter which are held in suspension by electro-static charge stabilized by an emulsifier. Based on the type of emulsifier used, Bitumen emulsions can be classified as

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