An asphalt binder blended with water in a colloid mill is referred to as:

An asphalt binder that is blended with water in a colloid mill is known as an emulsion. This process results in a stable mixture of asphalt and water that allows for easier application and enhances properties such as adhesion and workability. Emulsions contain tiny droplets of asphalt dispersed throughout the water, making them effective for various applications in pavement construction, especially when hot mix asphalt would be challenging to work with due to temperature constraints or other factors.

The colloid mill facilitates the even distribution of asphalt particles in the water, promoting a stable emulsion that can be easily managed during construction processes. This technology is important in the production of asphalt emulsions used for surface treatments, tack coats, and in cold mix applications.

In contrast, a suspension involves solid particles suspended in a liquid without forming a true solution. While foam relates to gas bubbles trapped in a liquid, bitumen refers more broadly to the naturally occurring viscous or solid form of asphalt (often synonymous with asphalt binder) but does not specifically denote an emulsion. Thus, the term emulsion accurately characterizes the product resulting from the mixing of asphalt binder and water in a colloid mill.