MODIFIED BINDERS FROM ALUMINOTHERMAL PRODUCTION SLAGS
AND CELLULAR HEAT-RESISTANT CONCRETES BASED ON THEM
V. A. Abyzov,
D. A. Rechkalov,
and S. N. Chernogorlov
Translated from Novye Ogneupory, No. 7, pp. 43 – 47, July 2015.
Original article submitted March 23. 2015.
Results are given for development of an aluminiferous binder based on aluminothermal production slags.
Binders are modified with additives based on polycarboxylate esters. Properties of the binders developed and
cellular heat-resistant concretes are provided.
Keywords: aluminiferous binder, aluminothermal production slag, additives based on polycarboxylate esters,
cellular concrete, heat-resistant concrete.
The main forms of binder used in domestic and overseas
practice for heat-resistant and refractory concretes are
aluminiferous (AC) and high-alumina cements (HAC) .
Their cost is quite high, since the technology is energy-con-
suming and requires expensive alumina raw material. Prom-
ising inexpensive high-alumina raw material for these bind-
ers is slag from aluminothermal ferroalloy production
[2 – 4].
In this work high-alumina cement from KVTs-70 and
KVTs-75 clinker according to TU 14-00186482-048–03
from the Klyuchevsk Ferroalloy Plant was used. Clinker was
prepared by adjustment of a raw material mix, and also
remelting of chromium metal and ferrotitanium alumino
thermal production slag (current production and dump); ce
ments based on them are distinguished by slow hardening
[3 – 5]. In addition, in order to prepare binders and additives
the following fuzed products were used according to TU
0798-069-00186482–2011, grade PP-50 (ferrochromium
slag), PPG-65, PPG-65K (based on ferrotitanium slag),
PPG-70 and PPG-75 (based on chromium metal slag), whose
compositions are provided in Table 1 .
From the point of view of preparing binder from slag
without additional introduction of CaO (during melting or
during subsequent remelting) carbon-free ferrochromium
slag is most promising, i.e., a product of fuzed PPG-50, a de
composed variety of it, and also ferrotitanium slag PPG65-K
enriched with CaO . Slag PPG-50 contains a significant
amount of calcium aluminate (CA and C
[1 – 3]. Alumina slag binder based upon it has been devel-
oped, and concretes depending of the form of filler, have an
application temperature of 1300 – 1700°C [2, 5].
In view of the fact that cements from KVTs-70 and
KVTs-75 clinker are distinguished by slow hardening, in or-
der to accelerate strengthening over 3 – 7 days slag PPG-50
and a decomposed variety were added. This provided rapid
strengthening of one day old cement, but there was a reduc-
tion in its setting (setting started in 5 – 10 min). A plastifier
was used in order to standardize binder properties. It has
been established that the effect of using lignosulfonates is in
significant. Use of SP-1 (S-3) makes it possible to obtain a
greater effect, which gives rise to a reduction in residual
strength after firing.
The superplastifiers developed comparatively recently
based on polycarboxylate (PCE) are of significant interest as
setting retardants and water-reducing additions for HAC.
They are the most effective due to a steric effect. In addition,
they are absorbed primarily on aluminates, making is possi
ble to control setting [7, 8]. In this work the effect of addi
tives based on PCE on hydration was studied by derivato
graphy and x-ray phase analysis. The best results were
achieved with use of Glenium 51 and Melflux 1641F (BASF
Construction Polymers, Germany) additives. Cement was
prepared with initial setting for 45 – 50 min. Action of these
additives is similar, i.e., the more additive the higher is the
content of unreacted CA
; one day old cement hydration
products are strongly amorphized. In x-ray diffraction pat
terns for three day old cement strong lines for reflections of
Refractories and Industrial Ceramics Vol. 56, No. 4, November, 2015
1083-4877/15/05604-0386 © 2015 Springer Science+Business Media New York
FGBOU VPO South-Ural State University (NIU), Chelyabinsk,