There are numerous methods and additives available
to improve the durability and quality of road bitumen. A coal tar obtained by
coal coking was distilled in a laboratory into fractions of initial boiling
point IBP-180℃ (gasoline-like
fuel), 180℃ - 360℃ (diesel-like
fuel), and >360℃ (residue or coal tar pitch). The coal tar pitch was added
into road bitumen by up to 1 - 5 wt% and investigated the alteration of physical and chemical
properties. The physico-mechanical
properties of coal tar pitch and bitumen blends, as well as the chemical group composition, were determined using
standard techniques (MNS) and the SARA method, respectively. Results of
3% coal tar pitch addition into bitumen enhanced ductility by 12.4% and
softening point by 1.6℃. We found that blending with bitumen coal tar pitch as
a modifier could improve bitumen properties.
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