Cement-Free Refractory Concretes for Stress-Reduced Structures
1 Refratechnik Steel GmbH, 37079 Göttingen/Germany
2 Refratechnik Cement GmbH
Volume 10, Issue 4, Pages 43 - 50
Refractory concretes have signifcantly increased their importance for the production of steel, aluminium, cement, lime and the like. Thus, more and more their properties have come into focus, so not only the installation behaviour is important, but drying-out and heating-up procedure and performance regarding thermomechanical and thermochemical behaviour as well. The thermochemical behaviour is mostly characterized by the chemical/mineralogical composition, while the drying-out and heating up behaviour and the performance are also based on microstructural parameters. Here, cement-free concretes of the sol-gel- and geopolymer-bonded types are the latest state of the art. Their heating-up behaviour can be described as easy to dry, spalling due to steam explosions are largely avoided by reduced contents of crystalline-bonded hydrate water. Faster heating rates save money, time, and energy and are thus ecologically and economically advantageous. Furthermore their performance during use is characterized by less thermomechanical tensions in the monolithic lining, resulting in an improved performance and longer lifetime.
no-cement concretes, sol-gel bonding, geopolymer bonding, stress-reducing monolithic linings
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