1070-4272/02/7509-1525$27.00C2002 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 75, No. 9, 2002, pp. 1525!1528. Translated from Zhurnal Prikladnoi Khimii, Vol. 75, No. 9,
2002, pp. 1559!1562.
Original Russian Text Copyright + 2002 by Syroezhko, Begak, Fedorov, Proskuryakov, Semenova.
OF FOSSIL FUEL
Modification of Paving Asphalts with an Elastoplastic
A. M. Syroezhko, O. Yu. Begak, V. V. Fedorov,
V. A. Proskuryakov, and E. B. Semenova
St. Petersburg State Technological Institute, St. Petersburg, Russia
Mendeleev Russian Research Institute of Metrology, State Unitary Enterprise, St. Petersburg, Russia
Received January 9, 2002
Abstract-BND 60/90 and BND 89/130 paving asphalts were modified by addition of DST-30 elastoplastic
and petroleum plasticizers. Their performance at temperatures from 3(32335) to +(90395)oC was examined
in comparison with that of commercial unmodified asphalts, which are efficient at temperatures from 3(23327)
to +(44 350)oC.
Petroleum asphalts are the main binding material
in pavements. About 80% of the produced asphalt is
used for paving; the remainder is used in production
of roofing materials, house building, erection of vari-
ous hydraulic structures, laying of pipings; it is also
used in electrical engineering, chemical industry, and
some other fields [1, 2].
The durability of an asphalt concrete pavement
depends not only on the quality of the bed preparation
and of mineral fillers used, but also on the asphalt
In north-western Russia, the main supplier of as-
phalts is Kirishinefteorgsintez Production Association.
Because of specific features of tars from commercial
West-Siberian crude oil (increased content of paraffin-
ic and naphthenic compounds), used for producing
paving asphalts, the asphalts do not always have the
required performance and quality characteristics (soft-
ening point, penetration before and after standard heat
treatment, ductility, brittle point).
Since, in the forecastable future, oil refineries pro-
ducing asphalt by oxidation of petroleum tar with air
will have no ways of significantly improving their
consumer’s characteristics, one of the promising ways
to obtain high-quality materials is compounding of
asphalts with polymers .
In this work, we examined the possibility of im-
proving the quality of oxidized paving asphalts by
adding rubber. As noted in , asphalt3rubber com-
pounds are considerably more durable than common
In modification of a paving asphalt, it is desirable
to increase its softening point, make penetration less
temperature-dependent, make asphalt less susceptible
to elastic reverse deformation, increase the ductility
(especially at low temperatures), enhance the adhesion
of the asphalt to mineral fillers of asphalt concrete,
and extend the range of working temperatures.
To this end, it is first necessary to ensure good
compatibility of rubbers with asphalts. However,
elastoplastics are not all compatible with asphalts.
Their compatibility depends on the chemical composi-
tion of both asphalts and elastoplastics. It is known
that high-molecular-weight rubbers to be compounded
with asphalt require, for swelling and subsequent dis-
solution, larger amount of oils than that contained in
paving asphalts. Furthermore, these rubbers (elasto-
plastics) can induce coagulation of asphaltenes, which
are the major structuring components of asphalts; this
is inadmissible in production of high-performance
Therefore, in this work, we examined how the
properties of rubber-modified paving asphalts are
affected by addition of not only elastoplastics but also
available and relatively cheap plasticizers.
Experiments were performed with commercial pav-
ing asphalts BND 60/90 and BND 90/130 (Kirishinef-
teorgsintez). As modifier we used DST-30 divinyl3
styrene elastoplastic rubber [Voronezh Synthetic Rub-
ber Plant, TU (Technical Specifications) 38-403653
76], as the most economically acceptable. This elasto-
plastic is well soluble in asphalt.
As plasticizers we used commercial products: sec-
ond vacuum gas oil (SVG) from AVT-2 installation