HEAT-RESISTANT CORUNDUM CONCRETE
REINFORCED WITH ALUMINUM OXIDE FIBERS
SYNTHESIZED WITHIN A MATRIX DURING FIRING.
PART 8. PETROGRAPHIC AND X-RADIOGRAPHIC STUDY
OF REINFORCED REFRACTORY CONCRETE
V. N. Sokov,
S. D. Sokova,
and V. V. Sokov
Translated from Novye Ogneupory, No. 4, pp. 44 – 45, April 2015.
Original article submitted September 23, 2014.
It is noted that the reinforcing components is distributed quite uniformly within concrete. Adhesion with
binder is strong. Under action of high temperature there is active conversion of raw material fibers into corun
dum with an increase in volume. The material created surpasses unreinforced concrete with respect to strength
properties and thermal shock resistance, and is distinguished by good volume constancy during operation.
Keywords: mineral and phase composition, x-ray structural analysis, corundum, matrix, microstructure, rein-
In order to predict composite corundum concrete proper-
ties it was necessary to determine the uniformity of reinforc-
ing component distribution within matrix material, to study
structural changes occurring within it after heat treatment,
and to determine mineral and phase composition of rein-
forced corundum concrete.
A study of reinforced corundum concrete microstructure
(Fig. 1) has shown that specimens are white sintered mixture
within which corundum filler grains are cemented to each
other by finely dispersed binder substance. The structure of
the material is porous coarse-grained, pores have a slit-like
form, and do not communicate with each other. The reinforc
ing component is quite uniformly distributed within con
crete. Chemical reaction of fiber with matrix material is not
detected, but adhesion of reinforcing component with binder
Refractories and Industrial Ceramics Vol. 56, No. 2, July, 2015
1083-4877/15/05602-0142 © 2015 Springer Science+Business Media New York
Parts 1 – 4 of the article published in Novye Ogneupory
FGBOU VPO Moscow State Building University, Moscow,
Fig. 1. Reinforced corundum concrete microstructure: a) ´120, b ) ´300; c) ´500.