Advances in Materials
Volume 2, Issue 2, April 2013, Pages: 23-28
Received: May 1, 2013;
Published: May 30, 2013
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Fasil Alemayehu, Department of Chemical Engineering, KIOT, Wollo University, Kombolcha, Ethiopia
Omprakash Sahu, Department of Chemical Engineering, KIOT, Wollo University, Kombolcha, Ethiopia
Cement quality is typically assessed by its compressive strength development in mortar and concrete. The basis for this property is a well-burned clinker with consistent chemical composition and free lime. The main reason for the clinker free lime to change in situation with stable kiln operation is variation in the chemical composition of the kiln feed. This variation in chemical composition is related to raw mix control and the homogenization process. To ensure a constant quality of the product and maintain a stable and continuous operation of the kiln, the attention must be paid to storage and homogenization of raw materials and kiln feed. Due to variations in the kiln feed chemical compositions that affect its burnability and the fuel consumption. The raw materials for Portland cement production are the mixture (as fine powder in the 'Dry process') of minerals containing calcium oxide, silicon oxide, aluminum oxide, ferric oxide, and magnesium oxide. The homogeneity of feed chemical composition has an important relationship to fuel consumption, kiln operation, clinker formation and cement performance. In this regard an attempt made to deals with the mixing of raw materials process and estimation of composition of raw mill feed, kiln feed, as well as formed clinker, which were done successfully through various results obtained experimentally and various steps have been taken to reduce these variations in clinker quality.
Minimization of Variation in Clinker Quality, Advances in Materials.
Vol. 2, No. 2,
2013, pp. 23-28.
V.C. Johansen, L.M. Hills, F.M. Miller and R.W. Stevenson, "The Importance of Cement Raw Mix Homogeneity", International Cement, Chicago, USA, (2002), online on America's Cement (2003).
L.M. Hills, V.C. Johansen and F.M. Miller, "Solving Raw Materials Challenges", Conference Record of IEEE-IAS/PCA 2002 Cement Industry Technical Conference, May 2002, pp. 139-151.
G. Frigionea, F. Zenonea and M.V. Espositob, "The effect of chemical composition on Portland cement clinker grindability", Cement and Concrete Research, 13 (4): 483-492, (1983).
P. C .Hewlett, "Lea's Chemistry of Cement and Concrete", 4th edition, Arnold Publishers, London, Great British, (1998).
Operation datasheet of Al-Mergheb cement plant, Alahlia Cement Company, Al-Khoms city, Libya, July (2010).
F.M. Miller, "Dusty Clinker and Grindability Problems: Their Relationship to Clinker Formation", Rock Products, April (1980), pp. 152-157.
V. Johansen, "Cement Production and Cement Quality", Materials Science of Concrete, Vol. 1, Edited by Jan Skalny, American Ceramic Society, (1990).
W.H. Duda, "Cement data Book", Vol. 1, International Process Engineering in the Cement Industry, 3rd ed., Bauvelag GMBH, Berlin (1985).
British Standards 12, 1370, 4027, 1958, 1960, 1962, 1966.
C. Moore, "Chemical Control of Portland Cement Clinker," Ceramic Bulletin, 61(4): 511 515, (1982).
S. Ghabezloo, Comportement thermo-poro-m´ecanique d’un ciment p´etrolier, Ph.D. thesis, Ecole des Ponts ParisTech (2008).
S. Ghabezloo, J. Sulem, S. Gu´edon, F. Martineau, J. Saint-Marc, Poromechanical behaviour of hardened cement paste under isotropic loading, Cement and Concrete Research 38 (12) (2008) 1424 – 1437.
S. Ghabezloo, J. Sulem, J. Saint-Marc, The effect of undrained heating on a fluid-saturated hardened cement paste, Cement and Concrete Research 39 (1) (2009) 54 – 64.
S. Ghabezloo, J. Sulem, J. Saint-Marc, Evaluation of a permeability-porosity relationship in a low-permeability creeping material using a single transient test, International Journal of Rock Mechanics and Mining Sciences 46 (4) (2009) 761 – 768.
S. Ghabezloo, Association of macroscopic laboratory testing and micromechanics modelling for the evaluation of the poroelastic parameters of a hardened cement paste, Cement and Concrete Research 40 (8) (2010) 1197 – 1210.
S. Ghabezloo, Micromechanics analysis of thermal expansion and thermal pressurization of a hardened cement paste, Cement and Concrete Research 41 (5) (2011) 520 – 532.
G. L. Saout, E. Lcolier, A. Rivereau, H. Zanni, Chemical structure of cement aged at normal and elevated temperatures and pressures: Part i. class g oilwell cement, Cement and Concrete Research 36 (1) (2006) 71 – 78.
J. Bensted, G. J. Audley, P. N. Aukett, Studies of early hydration with class g oilwell cement using heatflow conduction calorimetry, Cement and Concrete Research 25 (2) (1995) 426 – 432.
Saasen, P. A. Log, The effect of ilmenite plant dusts on rheological properties of class g oil well cement slurries, Cement and Concrete Research 26 (5) (1996) 707 – 715.
P. Yan, Y. Zhou, Z. Yang, J. Qin, Microstructure formation and degradation mechanism of cementitious plugging agent slurries, Journal of Wuhan University of Technology–Materials Science Edition 22 (2007) 61–65.
Bernard, F.-J. Ulm, E. Lemarchand, A multiscale micromechanics-hydration model for the early-age elastic properties of cement-based materials, Cement and Concrete Research 33 (9) (2003) 1293 – 1309.
P. D. Tennis, H. M. Jennings, A model for two types of calcium silicate hydrate in the microstructure of portland cement pastes, Cement and Concrete Research 30 (6) (2000) 855 – 863.