1070-4272/02/7507-1198$27.00C2002 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 75, No. 7, 2002, pp. 1198!1199. Translated from Zhurnal Prikladnoi Khimii, Vol. 75, No. 7,
2002, pp. 1221!1222.
Original Russian Text Copyright + 2002 by Rozental’, Ivanova.
Prediction of Properties of Asphalt Oil in Asphaltic Concrete
D. A. Rozental’ and E. S. Ivanova
St. Petersburg State Technological Institute, St. Petersburg, Russia
Received February 26, 2002
Abstract-Evolution of characteristics of asphalt oil in contact with mineral ballast in the course of long-term
storage of asphaltic concrete at room temperature is studied. Data on the effect of the preparation time of mix
asphalt on the structure and properties of asphalt oil in asphaltic concrete are analyzed.
Asphalt oils are widely used in road construction as
materials for asphaltic concrete pavement. Asphalt
oils in asphaltic concrete play a role of an organic
binder for the mineral fraction. When manufacturing
asphaltic concrete, asphalt oil is mixed with mineral
ballast at 160oC for 20 min. Physical interaction of
asphalt oil with the mineral filler is accompanied by
formation of adsorption layers of the binder on the
filler grains. This process includes many adsorption3
desorption stages, until reaching the equilibrium.
This is a selective process, resulting in extraction of
the most readily adsorbed components from asphalt
oil, which, in its turn, distorts the thermodynamic
equilibrium in the colloidal system of asphalt oil.
As a result, the system is transformed, approaching
new equilibrium state corresponding to given condi-
tions. Finally, transformation of the asphalt oil struc-
ture changes its characteristics.
The factors influencing adsorption of asphalt oil
on the mineral filler surface are as follows : heat-
ing temperature, heating time t, the kinds of mineral
ballast and asphalt binder, and, finally, the ballast
The goal of this work was to predict the evolution
of characteristics of asphalt oil in asphaltic concrete.
Therefore, we studied the effect of the time of heating
of mix asphalt at 160oC on the adherence of asphalt
oil to mineral ballast. As mineral ballast we used
granite with a grading of 335 mm. The heating time
was varied from 20 min to 4 h. In experiments we
used BND 40/60 asphalt oil produced by the KINEF
Production Association, Limited Liability Company
from a mixture of West Siberian oils. The adhesion
was measured by the hot centrifugation method ,
followed by determination of the performance charac-
teristics of the extracted product.
With increasing heating time, the amount of as-
phalt oil retained on the mineral ballast surface in-
creases, saturating at t = 3 h (see figure).
Evolution of the performance characteristics (pene-
and softening point T
) of asphalt oil
extracted from mix asphalt by centrifugation is given
t, h 0 1/3 2/3 1 2 3 4
, oC 51545667707273
With increasing t, the softening point considerably
increases, and the penetration abruptly decreases.
At t = 3 h these parameters approach their saturated
The observed evolution of the softening point and
penetration is well consistent with data on the adhe-
sion of asphalt oil to the mineral ballast, suggesting
that establishment of the adsorption equilibrium in
mix asphalt takes about 3 h.
In asphaltic concrete in service, asphalt oil occurs
in the cold state. Our results obtained at room tem-
perature allow prediction of the behavior of asphalt oil
in asphaltic concrete pavements.
Effect of the heating time t of mix asphalt at 160oCon
the adherence of asphalt oil to mineral ballast A.