The most of commonly used castables are bonded by calcium aluminate cement (CAC). There are also other alternative binders such as phosphates, hydratable alumina, organic bond, colloidal silica, etc. The main reason for replacing traditional hydraulic bond is to reduce calcium oxide content, which mainly causes formation of low melting phases during firing. Thus, mechanical and refractory properties can be deteriorated while calcium aluminate phases are decomposing. Sol-gel method is successfully applied mainly in cement-free (No Cement Castables - NCC) vibratable or self-flowing castables. The most used colloidal sol is colloidal silica sol, especially thanks to relative low price in comparison to alumina and titanium sols. Main aim of this thesis is design of no cement castable based on sol-gel method with emphasis on improving physical-mechanical and refractory properties in comparison to ultra-low cement castable.

1.
S.
Kannabiran
and
Z.
Minghua
,
No Cement Castable - An Innovative Solution for Energy Saving from Höganäs Bjuf AB
, in REFRA
2017
,
The Czech Ceramic Society
.
2.
M.
Nouri-Khezrabad
,
M. A. L.
Braulio
,
V.C.
Pandolfelli
,
F.
Golestani-Fard
,
H.R.
Rezaie
,
Nano-bonded refractory castables, Ceramics International
,
2013
, Vol.
39
, pp.
3479
3497
.
3.
L.
Keršnerová
,
K.
Lang
,
P.
Kovář
,
L.
Nevřivová
,
Improving the Properties of Refractory Materials by Sol-gel Method
, in REFRA
2019
,
The Czech Ceramic Society
.
4.
C.
Parr
,
T.A.
Bier
,
N.E.
Bunt
,
E.
Spreafico
,
Calcium aluminate cement based castables for demanding applications
, in
1st Monolithic conference
,
Iran
,
1997
.
5.
H.E.
Bergna
and
W.O.
Roberts
,
Colloidal Silica: fundamentals and applications
.
CRC Press
,
2005
.
6.
S.H.
Badiee
and
S.
Otroj
,
Non-cement refractory castables containing nano-silica: Performance, microstructure, properties
, in
Ceramics-Silikaty.
2009
, Vol.
53
, pp.
297
302
.
7.
R.
Sarkar
and
J.
Srinivas
,
Effect of Cement and sol Combined Binders on High-Alumina Refractory Castables
.
Refractories Worldforum
,
2016
, Vol.
8
, Göller Verlag GmbH, pp.
73
78
.
8.
J.
Neese
,
B.
Kesselheim
,
S.
Rollmann
,
S.
Scheffler
,
HYBRID – Advance for Sol-Gel Bonded Refractory Concrete
,
Refractories Worldforum
,
2019
, Vol.
4
, Göller Verlag GmbH, pp.
37
43
.
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