What does 'break' mean in emulsified asphalt?

• A. Color change of the mixture without separation
• B. Emulsion remains fully stable and no separation occurs
• C. Broken = complete separation of base asphalt and water
• D. Droplets coalesce to a larger size but stay in water

Answer: (C)

In an asphalt emulsion, stability comes from the coating around tiny asphalt droplets that keeps them dispersed in water. When the emulsion breaks, that stability is lost and the asphalt separates from the water, forming two distinct phases. This means the base asphalt and water no longer mix; the asphalt may coalesce and rise to the surface or settle out, leaving a clear separation between the asphalt-rich phase and the water. That’s why the breakdown is described as a complete separation of the base asphalt and the water.