1070-4272/02/7506-1009 $27.00 C 2002 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 75, No. 6, 2002, pp. 1009!1013. Translated from Zhurnal Prikladnoi Khimii, Vol. 75, No. 6, 2002,
Original Russian Text Copyright + 2002 by Fedorov, Syroezhko, Begak, Proskuryakov, Borovikov .
OF FOSSIL FUEL
Modified Paving Bitumens Based on Tar
and Petroleum Polymeric Resins
V. V. Fedorov, A. M. Syroezhko, O. Yu. Begak,
V. A. Proskuryakov, and G. I. Borovikov
St. Petersburg State Technological Institute, St. Petersburg, Russia
Mendeleev Russian Research Institute of Metrology, State Unitary Enterprise, St. Petersburg, Russia
Slantsy Plant, Joint-Stock Company, Slantsy, Leningrad oblast, Russia
Received October 2, 2001
Abstract-Modification of tar with petroleum polymeric resins yields paving-grade bitumens with enhanced
cohesion. With respect to the heat resistance and other parameters, these bitumens meet the requirements of
GOST (State Standard) for BND 90/130 paving bitumens.
Rheological and physicochemical characteristics of
bitumens are improved by adding various polymers,
synthetic rubbers, or rubber crumb  in amounts of
135%. Blending bitumen with a polymer or a poly-
mer with a solvent requires special equipment ensur-
ing efficient mixing.
Thermopolymeric resins obtained from products of
naphtha pyrolysis, having softening points of 803
95oC (Pyroplast, dark resin; Pyroplast-2, light resin),
which are produced in compliance with TU (Technical
Specifications) 381091379 and 14689373, are readily
blended with bitumens and petroleum tar on standard
apparatus of asphalt-concrete plants. These additives
impart to bitumens and tar high heat resistance and
plasticity, improve their adhesion to mineral fillers,
and enhance the cohesion strength of a pavement .
Addition of 133% petroleum polymeric resins (PPRs)
has been noted to improve such physicomechanical
properties of bitumen as ductility, plasticity, elasticity,
adhesion strength, and cohesion strength, whereas
larger (8310%) additions of PPRs produced a some-
what weaker effect. At the same time, as noted in
, such modifiers exert a positive effect mainly on
the cohesion of bitumens, decreasing their plasticity
(penetration). This study is aimed at refining the ef-
fect of these modifiers.
The ring-and-ball softening point (oC) was deter-
mined according to GOST 9950383; penetration, ac-
cording to GOST 11508378; ductility, according to
ASTM D2872377 standard; and brittle point, accord-
ing to GOST 11507378 and by calculation using the
Gun formula 
is the softening point (oC), T
is the brittle
point (oC), and PI is the penetration index (determined
from a nomogram) .
The heat resistance of bitumens and modified for-
mulations was determined by a standard procedure.
Samples were placed in stainless steel cups (bed
height 4 mm, sample weight 60 + 1 g). The samples
were heat-treated at 160oC for 5 h, after which the
softening point, penetration P, ductility D, and weight
loss Dm (%) were measured.
The adhesion of binder samples to a mineral filler
was determined by aqueous cooking with granite and
gabbro-diarite (335-mm fraction). The filler : bitumen
ratio was 15 : 0.6. The cooking was performed for
30 min on a standard grid. The adhesion was evalu-
ated from the weight loss of the material through
washout of the binder with boiling water from the
filler surface. The specific surface area of the 335-mm
fraction is close to that of fillers used in Russian
plants for production of asphalt concrete.
The water absorption of the binder was determined
by the formula