Numerical Simulation and Experimental Set-up for Predicting the Drying Behavior of Calcium Aluminate Cement (CAC)-Bonded Refractory Castables
1 Federal University of São Carlos (UFSCar), Materials Engineering Department, São Carlos SP 13565-905/Brazil
2 Imerys, 38090 Vaulx-Milieu/France
3 Institute of Mathematical and Computer Sciences(ICMC-USP), São Carlos SP 13566-590/Brazil
Revision 13.07.2019, 23.07.2019
Volume 11, Issue 4, Pages 78 - 81
Abstract
During the initial heating of Calcium Aluminate Cement (CAC)-bonded castables, physical and chemically-bonded w ater is released. Therefore, when the refractory’s permeability level is limited, pressure buildup inside the dense microstructure can tak e place , resulting in cracks and spalling of the cer amic lining. Recently, complex models have been developed for the prediction of the temper ature, pressure, moisture and displacement felds within dense material. Some of them also consider numerous par ameters (i.e., multiple phases , the thermomechanical features and the lik ely induced damage, etc.), but all rely on complex experiments that depend on multiple thermocouples and pressure transducers. According to these advances, by a joint effort between the university and the CAC binder producer, the present work aims to develop an accessible model based on few parameters, which could be v alidated and adjusted by simple thermogr avimetric experiments. The results pointed out that such a fr amework is promising and able to satisfactorily predict the overall behavior of the castables’ compositions during drying tests. Additionally, the proposed model could also be further v alidated with current experimental techniques in order to successfully be scaled up and estimate the drying behavior of larger specimens as well as products with more complex geometries.
Keywords
numerical simulation, castables, drying behaviour
References
[1] Alexei Luik ov (Ed.): Heat and mass tr ansfer in capillary-porous bodies. Oxford 1966, 3–10 [2] Bažant, Z.P .; Thonguthai, W.: P ore pressure in heated concrete walls: Theoretical prediction. Mag. Concr. Res. 31 (1979) [107] 67–76 [3] Gong, Z.X.; Mujumdar, A.S.: The infuence of an impermeable surface on pore pressure during drying of refr actory concrete slabs . Int. J . Heat Mass Transf. 38 (1995) [7] 1297–1303 [4] Gong, Z.X.; Song, B.; Mujumdar, A.S.: Numerical simulation of drying of refractory concrete. Drying Technol. 9 (1991) [2] 479–500 [5] Gong, Z. X.; Mujumdar, A.S.: A model of kiln-drying for refractory concrete. Drying Technol. 11 (1993) [7] [6] Tenchev, R.T.; Li, L.Y.; Purkiss, J.A.: Finite element analysis of coupled heat and moisture transfer in concrete subjected to fre. Numer. Heat Transf. Part A, Appl. 39 (2001) [7] 685–710 [7] Gawin, D.; Majorana, C .E.; Schrefer , B .A.: Numerical analysis of hygro-thermic behaviour and damage of concrete at high temperature. Mech. Cohesive-frictional Mater. 4 (1999) [1] 37–74 [8] Fey, K.G.; et al.: Experimental and numerical investigation of the frst heat-up of refr actory concrete. Int. J. Therm. Sci. 100 (2016) 108–125 [9] Oummadi, S.; et al.: Distribution of water in ceramic green bodies during drying. J. Europ. Ceram. Soc. 39 (2019) 3164–3172 [10] Dauti, D .; et al.: Modeling of 3D moisture distribution in heated concrete: from continuum towards mesoscopic approach. Int. J. Heat Mass Transf. 134 (2019) 1137–1152 [11] Bažant, Z.P.; Jirásek, M.: Creep and hygrothermal effects in concrete structures. Dordrecht 2018, 628–629 [12] Innocentini, M.D .M.; Pardo, A.R.F.; Pandolfelli, V.C.: Influence of air compressibility on the permeability evaluation of refractory castables . J . Amer. Ceram. Soc. 83 (2000) [6] 1536–1538
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