Cement-Free Refractory Concretes for Stress-Reduced Structures

Bertram Kesselheim1, Thomas Schemmel1, Kai Beimdiek2, Hans-Jürgen Klischat2

1 Refratechnik Steel GmbH, 37079 Göttingen/Germany
2 Refratechnik Cement GmbH

Revision

Volume 10, Issue 4, Pages 43 - 50

Abstract

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.

Keywords

no-cement concretes, sol-gel bonding, geopolymer bonding, stress-reducing monolithic linings

References

[1] Allen, William G.: State-of-the-Art Refractory Shotcrete Techniques and Practices. Shotcrete Spring 2008, 20–24 [2] Beimdiek, K.: Wet-gunning technology: Practical experience as a refractory system solution in cement plants. ZKG International 28 (2005) [11] 48–58 [3] WO2018/108679A1: Mixing nozzle for a gunned concrete application device, gunned concrete application device having such a mixing nozzle, and gunned-concrete application method. June 21, 2018 [4] PRE Annual Statistics 2015.The European Refractories Producers Association, Brussels 2015 [5] Routschka, G. (ed.): Handbook of Refractory Materials, 4th edition, Vulkan Verlag, Essen 2012, 120 [6] Groger, P.; Klischat H.-J.; Puntke, S.: Infuence of the refractory lining on the cost effciency of clinker production. Cement Int. 15 (2017) [3] 66–73 [7] da Luz, A.; Braulio, M.; Pandolfelli, V.: Drying behavior and design of refractory concretes F.I.R.E. Compendium series, refractory concrete engineering, Göller Verlag GmbH, Baden Baden, (2015) 317–418 [8] Beimdiek, K.; Kesselheim, B.; Klischat, H.-J.; Schemmel, T.: Cement-free refractory concretes as technology leap for several industries and applications. Proceedings Unitecr 2017, 6 Bi ennial Worldwide Congress, Santiago de Chile, 26–29 September [9] Schemmel, T.; Thieser, G.; Pftzmer, N; Kremer, U.: A novel method of online measurement to develop specifc heating-up procedures for in- dustrial furnaces. TMS (The Minerals, Metals & Materials Society) 2014, San Diego, USA, 2014, 1015–1017 [10] Weibel, G.:Importance of physical properties for the development of basic refractory bricks. REFRA Kolloquium 1986, Hohenroda, REFRATECHNIK GmbH, Göttingen, 46–72 [11] Klischat, H.-J.; Vellmer, C.; Wirsing, H.: Smart refractory solution for stress loaded rotary kilns. ZKG International 66 (2013) [5] 54–60 [12] DIN EN ISO 1893:2008-09: Feuerfeste Erzeugnisse – Bestimmung des Erweichungsverhaltens unter Druck (Druckerweichen) – Differentialverfahren mit steigender Temperatur (ISO 1893:2007) (Refractory products – Determination of refractoriness under load – Differential method with rising temperature (ISO 1893:2007); Deutsche Fassung EN ISO 1893:2008, Beuth Verlag, Berlin 2008 [13] Leupold, H.; Santowski, K.; Wieland, K.: Verbesserung der Alkalibeständigkeit feuerfester Werkstoffe aus dem System SiO –Al O für Zementdrehrohröfen im Temperaturbereich bis 1300 °C. Proc. 26 Int. Coll. Refractories, Aachen, Oct. 1983, p. 236-256 [14] Liever, H.; Klischat, H.-J.; Wirsing, H.: Alkalibeständige Zustellung der Sicherheitszone von chemisch belasteten Zement- und Kalkdrehöfen. Alkali-resistant linings for the security and preheating zones in rotary cement and lime kilns subject to chemical attack. ZKG International 55 (2002) [6] 66-75 [15] Schemmel, T.; Jansen, H.; Kesselheim, B.: Nanobond – The new cement free castable for quick lining and fast repairing. International Scientifc Conference, Refractories, Furnaces and Thermal Insulations, High Tatras, Slovakia, 2012

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Göller Verlag GmbH