By Nurul Hidayah
Bitumen is a black or dark brown non-crystalline solid or viscous material, composed principally of high molecular weight hydrocarbons, having adhesive properties, derived from petroleum either by natural or refinery processes and substantially soluble in carbon disulphide. Refer to Ali Akhber Yousefi (2002), bitumen in pure form is not suitable for modern roads and present traffic, therefore forced engineers to modify bitumen to improve its performance during service life.
The modified binder are more stable under heavy loads, braking and accelerating forces and shows increased resistance to permanent deformation in hot weather. It resists fatigue loads and having better adhesion between aggregates and binders.
TYPE OF BITUMEN MODIFIER AND ADDITIVE
There are 3 type of bitumen modifier, namely :
(1) physical modification
(2) chemical modification
(3) other type modification
The table 1 below showed the type of modifier and example of additive that being used to modify the bitumen.
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