Blown Bitumen R115/15
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An asphalt emulsion consists of three basic ingredients: asphalt, water, and an emulsifying agent. On some occasions, the emulsion may contain other additives, such as stabilizers, coating improvers, anti-strips, or break control agents. It is well known that water and asphalt will not mix, except under carefully controlled conditions using highly specialized equipment and chemical additives. The blending of asphalt and water is the same as an auto mechanic trying to wash grease from his hands with only water. Only with a detergent or soapy agent can grease be successfully removed. The soap particles surround the globules of grease, break the surface tension that holds them, and allow them to be washed away.
Anionic, non-ionic and cationic emulsifiers are all available, which will successfully emulsify bitumen and provide storage stable emulsions. Cationic emulsifiers offer additional advantages, which arise from the fact that most naturally occurring aggregates are negatively-charged in
aqueous media, and have a capacity to absorb cationic emulsifiers. Choice of emulsifier type, and emulsion formulation enables the rate of breaking of the emulsion to be controlled. The emulsifiers remain in the cured seal and are concentrated at the interface between bitumen and aggregate and act as antis tripping agents.