THINNING, PLASTIFYING, AND STRENGTHENING ADDITIONS
AS EFFECTIVE MODIFIERS IN HCBS AND CERAMIC CONCRETE
Yu. E. Pivinskii
Translated from Novye Ogneupory, No. 12, pp. 11 – 16, December 2011.
Original article submitted July 27, 2011.
The efficiency of using thinning (deflocculating), plastifying, and strengthening additions in HCBS technol
ogy, ceramic concretes, and new unmolded refractories, is demonstrated. Quantitative criteria are proposed for
evaluating addition efficiency. In the field of preparing the materials in question the practice of using compos
ite (combined) modifying (deflocculating) additions that have a high synergetic effect predominates. They are
distinguished by an electrosteric stabilization mechanism. Solutions or powders, used in the preparation of un
fired materials, strengthened by a UKhAKS-mechanism (strengthening by chemical activation of contact
bonds), are a special group of additions.
Keywords: thinning, deflocculation, plastification, water glass, lump silicate, UKhAKS (strengthened by
chemical activation of contact bonds)-materials, synergetic effect.
During development and introduction of materials tech-
nology, obtained on the basis of highly concentrated binding
suspensions (HCBS), considerable experience has been ac-
cumulated for the use of different additions made to an
HCBS composition, or molding systems based on them, with
the aim of controlling rheotechnological properties, and also
properties of final materials [1 – 5]. The functional purpose
of an addition may be different. Apart from thinners
(deflocculants), additions are used for improving mix and
object molding capacity, controlling mix plasticity, etc.
A special group relates to additions (solutions, powders) in
troduced in order to strengthen materials by the UKhAKs-
mechanism (strengthening by chemical activation of contact
bonds). Experience accumulated in the field of HCBS, and
known data in the sphere of preparation of a new generation
of unmolded refractories [6 – 8], make it possible to propose
that in the area of development and application of new addi
tions there is considerable reserve for improving both the
rheotechnological properties of the corresponding molding
systems, and also materials based on them. A generalized
concept is introduced in this work for all groups of additions
in the form of the term “modifiers”. This term with quite
broad interpretation has been used for a long time in building
concrete technology [9, 10], where there is a problem for sci
entists and technologists similar to that in question. Accord-
ing to [9, 10], by application of modifiers to cement systems
we understand introduction of a substance in a small amount
improving both production properties of concrete mixes, and
also the building and engineering properties of concretes
based on them.
IMPORTANCE OF PRINCIPLES OF OPTIMUM
THINNING AND RHEOTECHNOLOGICAL
In the 1980s, as applied to HCBS and ceramic concrete
technology, we formulated the basic theoretical principles for
their preparation, including optimum thinning and rheotech
nological conformity, or the RTC principle [1, 3]. Whereas
the essence of the first consists of creating conditions for
grinding and subsequent stabilization, providing the maxi
mum degree of thinning, or HCBS deflocculation, then real
ization of the RTC principle is connected with providing the
optimum and energy effective production regimes in accor
dance with rheological features of the corresponding HCBS
and molding systems based on them, and control of rheo
technological properties of the latter in the required direction
[1, 3, p. 75]. Considering the chronological aspect of the
question for development of research and technology in the
field of a new generation of unmolded refractories [3,
Refractories and Industrial Ceramics Vol. 52, No. 6, March, 2012
1083-4877/12/05206-0419 © 2012 Springer Science+Business Media, Inc.
OOO NVF Kerambet-Ogneupor, St Petersburg, Russia.