Dispersing Technology and the Impact from Inherent Formulation Variations
Kerneos SA, 92521 Neuilly-sur-Seine/France
Volume 7, Issue 3, Pages 59 - 68
Low cement (LCC) or deflocculated castable technology has been widely adopted in the past decades due to the improved thermomechanical properties and corrosion resistance that these castables display in service. These improvements in performance have been made possible by the increased sophistication of refractory formulations and improvements in installation methods. In particular, the use of mathematical models for calculating precise grain distributions, as well as the use of fine particle sized fillers of alumina and microsilica allow for the development of very dense castable structures with excellent properties in a wide range of refractory applications. These dense structures also rely on high performance deflocculants and dispersing agents in order to fluidify the castables with a minimum amount of water.
deflocculation mechanism, LCC castables
 Hommer, H.: Polycarboxylate ether dispersants – Interaction with microsilica containing low-cement castables. UNITECR, Dresden, Germany, (2007) 401–404  Planck, J.; et al.: Effectiveness of polycarboxylate superplasticizers in ultra-high strength concrete: The importance of PCE compatibility with silica fume. J. Adv. Concrete Technol. 7 (2009)  5–12  Zetterstrom, C.; Wöhrmeyer, C.; Frier, E.: Deflocculation of low cement castables – the different behavior of alumina spinel castables and alumina-microsilica castables. EUROGRESS, Aachen, Germany (2014)  Parr, C., et al.: Investigation into the interactions of deflocculated castables which control placing and hardening properties. UNITECR, Dresden, Germany (2007)  Scrivener, K.; Capmas, A.: Calcium aluminate cements. In: Lea’s chemistry of cement and concrete. Ed. Peter C. Hewlett. New York 2003, 713–782  Cesarano III. J.; Aksay, I.A.: Processing of highly concentrated aqueous alumina suspensions stabilized with polyelectrolytes. J. Amer. Ceram. Soc. 71 (1988)  1062–1067  Lewis, J.A.: Colloidal processing of ceramics. J. Amer. Ceram. Soc. 83  (2000) 2341–2359
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