The difference between emulsified asphalt and modified asphalt, emulsified asphalt has water, modified asphalt has no water. Can be used at room temperature, has good fluidity, easy to use, which is the advantage of emulsified asphalt. When the water volatilized emulsified asphalt in the asphalt again agglomeration, the aggregate package, the formation of a stable pavement structure. Compared with ordinary modified asphalt, emulsified asphalt in the use of construction has the advantages of convenience and time saving.
Emulsified asphalt is an emulsion, simply put, a small droplet of asphalt suspended in water. The continuous phase is water and the dispersed phase is bitumen. Bitumen exhibits properties similar to a solid at room temperature and a liquid at high temperatures. Therefore, after dispersing the bitumen into water, it can be used at room temperature, which is an advantage of emulsified bitumen. The manufacturing process of emulsified asphalt is shown in the figure below, in a nutshell, the asphalt heated to a liquid is mixed with an emulsifier, stabilizer, acid or alkali colloid to obtain emulsified asphalt.
The density of asphalt and water is very close, so asphalt can be suspended in water, emulsifier is a surfactant, and soap, laundry detergent is a series. The molecules of this goods a hydrophilic, lipophilic, once mixed with asphalt and water will be adsorbed to the interface between asphalt and water, the asphalt group wrapped around the hydrophilic end of the charge, so that the emulsification can be maintained after the stability. Emulsified asphalt is essentially the same as milk, milk is a very small fat particles suspended in water wrapped in protein.
Modified asphalt is the means of mixing rubber, resin, polymers and other modifiers to the asphalt after the modification of the asphalt binding material. Through the modifier, uniform distribution of asphalt within the formation of a special grid structure, improving the asphalt molecules anti-degradation fission capacity, extending the service life of the material.
