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Asphalt or bitumen is a viscous liquid which is a hydrocarbon with little sulfur, oxygen, and chlorine. Asphalt as a binder in flexible pavement has viscoelastic properties. The asphalt looked solid at room temperature but is a liquid that is sooo thick. Asphalt is a material that is highly complex and chemically well characterized yet. The main content of the asphalt is a compound of carbon saturated and unsaturated, aliphatic and aromatic having up to 150 carbon atoms per molecule. Atoms in addition to hydrogen and carbon which also compose the asphalt is nitrogen, oxygen, sulfur, and some other atoms.