![]() ![]() This type of bitumen emulsion doesn't break as when applied on aggregate. This type of emulsifier are relatively stable. In this type of emulsion, a special type of emulsifier is used to slow the process of water evaporation. These droplets spread on the aggregate and bind with each other and gains strength eventually.īased upon the time taken by the vitamin emulsion to evaporate the water and between particles to separate from water, bitumen emulsion is further classified into 3 types based on setting time: a) Slow setting emulsion When the bitumen emulsion is applied on the aggregate for the road works the water evaporates leaving behind the bitumen droplets. The bitumen emulsion is classified into two types: ![]() The mix received from the colloidal mill is stored in the storage tanks and used as per requirement. But the droplets try to join them self with each other and make it settle down.īut the emulsifier added creates a coating of surface charge around every drop droplet of the bitumen that helps to keep away from each other on the other hand it is also it also keeps the droplet in dispersed and suspended form. Average size of bitumen droplet is about 2 Micron. The colloidal mill breaks down the bitumen into very tiny droplets. The average range of bitumen mixed is from 40 to 70%. If it is used for important works then between percent can range up to 60 to 70%. The amount of bituminous to be added depends upon the nature of use of bitumen emulsion. Now water emulsifier mix is added with bitumen in a colloidal mill. The choice of emulsifier depends upon its ionic nature of the mix. The production of bitumen emulsion takes place in two simple steps:įirstly, the water is mixed with the appropriate emulsifier and other chemical agents. “Therefore, bitumen emulsion is a dispersed liquid consisting of three products, i.e. As the droplets are very fine they suspend in water. Emulsifier keeps the bitumen in its fine droplet state by disallowing it to mix with other droplets. ![]() To overcome this problem an emulsifier is used.Įmulsifier can be defined as a surface-active agent. But as the bitumen is a petroleum product it doesn't mix with water and as it is sticky in nature, it doesn't easily gets disintegrated into fine droplets.
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