The globules of the same charge hence repel each other, making the whole system stable. The emulsions can be cationic (positive charge) or anionic (negatively charged). An emulsion can be created by using an emulsifier or emulsifier agent which soap-like substance is used to coat each individual particle of another substance and so prevent these particles from sticking together. An emulsion is a stable mixture of extremely small particles of one liquid dispersed (spread) in another liquid in which it does not dissolve. In this way, the bitumen particles repel each other due to the induced load and float in water in the form of spheres with a diameter of one hundredth to one thousandth of a millimeter. As a result, bitumen emulsion is a liquid product composed of three components (water + emulsion + asphaltum) in which droplets of asphaltum are suspended in water. The ionic part of the chain is drawn to water, whereas the hydrocarbon part is attracted to bitumen. An electrochemical environment is provided by this emulsifier. The addition of an emulsifier to water facilitates in the breakdown of asphalt into minute particles and maintains it disseminated in suspension. It is well known that water and asphalt will not mix, except under carefully controlled conditions using highly specialized equipment and chemical additives.Īn emulsifier with a long hydrocarbon chain and either a cationic or anionic ending is employed as a surface active agent should be mixed with water before adding asphaltum because asphaltum is an oil and cannot be combined with water. Based on specifications it may contain other additives, such as stabilizers, coating improvers, anti-strips, or break control agents. The amount of emulsifier is very small and is about 0.3 to 0.5% by weight of bitumen.īitumen emulsion consists of three basic ingredients: bitumen, water, and an emulsifying agent. It’s basically an O/W (Oil on Water solution) a dispersion of bitumen particles on water, stabilized with the addiction of surfactants (Surface active agents) or most commonly known as emulsifiers, that will permit the bitumen to de-diluted in water. Holding a share of 20% global bitumen use, Emulsion Bitumen (Water bitumen) is obtained by mixing bitumen and water with an emulsifier.
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