STUDY OF THE EFFECT OF TYPE OF HIGH-ALUMINA CEMENT
ON THE PROPERTIES OF HEAT-RESISTANT CONCRETE
WITH A COMPOSITE DEFLOCCULANT
and O. Pyren’kin
Translated from Novye Ogneupory, No. 7, pp. 34 – 37, July 2010.
Original article submitted April 22, 2010.
Differences are demonstrated in hydration of high-alumina cements, produced in the Gor’ka Plant (Poland), in
the presence of both individual and composite deflocculants. Properties are provided for medium-cement
heat-resistant concrete with a composite deflocculant in relation to cement type.
Keywords: high-alumina cement, medium-cement heat-resistant concrete, composite deflocculant, heat re
lease, physicomechanical properties.
Previous studies  have shown that by means of a com-
posite of two deflocculants (sodium tripolyphosphate and
polycarboxylate ester Castament FS-20) it is possible to con-
trol the rate of hydration and formation of the structure of
medium-cement heat-resistant concrete during hardening. It
was established that it was possible to increase concrete
strength properties considerably: after firing at 1200ºC the
ultimate strength in compression of concrete with a compos
ite deflocculant (160 MPa) exceeds by almost a factor of two
the strength of concrete in which only one of the
deflocculants is used (80 – 100 MPa). It was assumed that
within the concrete with a composite deflocculant there may
be formation of nanostructures, due to which there is a con
siderable increase in the strength of this concrete. Alumina
cement was used in the studies, within which the amount of
aluminum oxide was about 40%.
Of interest is how the properties of medium-cement con
crete with a composite deflocculant may affect higher quality
high-alumina cement. It is noted  that in this case choice
of ultrafine and plastifying additions may change to a consid
erable extent some heat-resistant concrete properties. There
fore one aim of this work was to reveal features of the
hydration of different cements and how individual defloccu
lants (sodium tripolyphosphate and Castament FS-20) and
also composite deflocculant affect cement hydration. An-
other aim is a study of features of the effect of different types
of cement on the physicomechanical properties of me-
dium-cement heat-resistant concrete.
The following materials were used for the study: cement
Gorkal 70 (G70) (Al
not less than 70%), Gorkal 70F
³ 70%), Gorkal 80 (G80) (Al
³ 70%) pro
duced in Poland; microsilica grade RW-Fuller from the Ger
man firm RW Silicium GmbH (SiO
96.1%); mullite filler
and dispersed mullite (Al
£ 65%); deflocculant Casta
ment FS20 (FS) produced by BASF (Germany), and anhy
drous sodium tripolyphosphate Na
For a study the specific surface of cement the instrument
used was a Testing unit from the firm Blain, viscosity of the
cement paste was measured in an AND-10 viscosimeter, and
microcalorimetric studies of the cement paste were carried
on in ToniCal Model 73333 calorimeter. The W/C index in a
cement paste was 0.35, the amount of individual defloc
culants was 0.1%, and for composite deflocculant it was
0.3% of the amount of cement.
In order to reveal the effect of the type of cement on
physicomechanical properties of medium-cement heat-resis
tant concrete the following concrete composition was used,
%: cement 10, microsilica 5, dispersed mullite 20, mullite
Refractories and Industrial Ceramics Vol. 51, No. 4, 2010
1083-4877/10/5104-0279 © 2010 Springer Science+Business Media, Inc.
From the proceedings of the International Conference of Metal
lurgists and Refractory Workers (April 22 – 23, 2010, Moscow).
Gediminas Scientific Institute of Heat Insulation VTU, Kaunas,
OOO PKF Tsemogneupor, Podol’sk, Moscow Region, Russia.