Types of bitumen modifiers and additives
In order to modify some properties of bitumen additives or bitumen modifiers
Is used.
These compounds
They include a wide range of minerals, organic, natural and industrial.
Modified bitumens by type
Additives or bitumen modifiers are divided into the following three main groups:
1- Modified polymer bitumens
2- Bitumen modified with rubber
3- Bitumens modified with chemicals
Modified polymer bitumens
Construction of asphalt concrete pavements has been developed using pure bitumen modified with suitable polymers.
Since the tests do not show the performance characteristics of polymer-modified bitumens, therefore, the appropriate polymer is selected based on the physical properties of the polymers and the desired performance characteristics.
Polymers are divided into two categories based on their physical properties: plastomers and elastomers.
When the polymer is stretched, if the load is pulled in the same position, the residue remains
It remains a plastomer and if it returns to its original shape, it is an elastomer.
Rubber modified bitumen
These bitumens are made by mixing recycled rubber powder
And if necessary, mineral additives or other fiber materials are prepared with pure bitumen.
Consumable powder should be mixed with hot bitumen so that the particles
The tires are sufficiently swollen and expanded before using bitumen.
Bitumens that are modified in this way
They are divided into three groups in terms of viscosity, which are high to low concentrations, respectively.
Chemical modified bitumen
Chemical-modified bitumens are made by adding stabilizing chemicals to pure bitumens
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