Civil Engineering Reference
In-Depth Information
FIGURE 9.9
Rutting that could result from the use of too soft asphalt.
Hot climate
Cold climate
Optimum
viscosity
range
Soft
Hard
FIGURE 9.10
Selecting the proper
grade of asphalt binder to match the
climate.
Log temperature, Degrees Rankine
9.4
Chemical Properties of Asphalt
Asphalt is a mixture of a wide variety of hydrocarbons primarily consisting of
hydrogen and carbon atoms, with minor components such as sulfur, nitrogen,
and oxygen (heteroatoms), and trace metals. The percentages of the chemical
components, as well as the molecular structure of asphalt, vary depending on
the crude oil source (Peterson 1984).
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