Browse > Article
http://dx.doi.org/10.6111/JKCGCT.2011.21.1.034

Characterization of artificial aggregates fabricated with direct sintering method  

Kim, Kang-Duk (Department of Materials Engineering, Kyonggi University)
Kang, Seun-Ggu (Department of Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.21, no.1, 2011 , pp. 34-40 More about this Journal
Abstract
The bulk density, water absorption and microstructure of the artificial aggregates were controlled as a function of sintering temperature (1100 and $1200^{\circ}C$) and time (10~60 min) in the fabrication process of the artificial aggregates by the direct sintering process using dredged soil, the inorganic wastes. Also, the physical properties of the artificial aggregates fabricated according to the different sintering methods such as the direct sintering method used in this study and the increasing temperature sintering method used in the previous report, were compared and analysed. The bulk density of aggregates sintered at $1200^{\circ}C$ by the direct sintering method showed below 1.0, and the thickness of a shell and the pore size of the black core were increased with sintering temperature. Also, in the same sintering temperature, the area of black core was decreased, the thickness of shell was increased and the water absorption was decreased with sintering time. The black core of artificial aggregates of bulk density below 1.0 had the similar microstructure, regardless of sintering methods. In contrast, the shell of aggregates fabricated by the increasing temperature sintering method showed more dense microstructure than that by direct sintering method, hence the water absorption of aggregate sintered using direct sintering was relatively high. Thus, the direct sintering method is suitable for fabrication of artificial aggregates in ceramic carriers or absorbents applications.
Keywords
Bulk density; Water absorption; Black core; Shell; Direct sintering method;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 K.J.D. MacKENZIEA and C.M. Cardile, "$A^{57}Fe$ Mossbauer study of black coring phenomena in clay-based ceramic materials", Journal of the Material Science 25 (1990) 2937.   DOI   ScienceOn
2 F. Negre, A. Barba, J.L. Amoros and A. Escardino, "Oxidation of black core during the firing of ceramic ware-2. process kinetics", British Ceramic Transactions and Journal 91 (1992) 5.
3 P.S. Nicholson and W.A. Ross, "Kinetic of oxidation of natural organic materials in clays", J. of the American Ceram. Soc. 53(3) (1970) 154.   DOI
4 V.Z. Abdakhimov and E.C. Abdrakhirnova, "Formation of the black core in high-speed firing of floor tiles", Glass and Ceramics 56 (1999) 263.   DOI   ScienceOn
5 V. Beltran, A. Blasco, A. Escardino and F. Negre, "Formation of black core during the firing of floor and wall tiles", Interceram 3 (1988) 15.
6 C.R. Austin, J.L. Nunes and J.D. Sulivan, "Basic factors involved in bloating of clays", American Institute of Mining and Metallurgical Engineer Technical Publication 1486 (1942) 1.
7 W.L. Fisher and L.E. Garner, "Bloating characteristics of east texas clays", Bureau of Economic Geology Geological Circular 65-1 (1965).
8 S.M. Han, D.Y. Shin and S.K. Kang, "Preparation for porous ceramics using low grade clay", J. of the Kor.Ceram. Soc. 35(6) (1998) 575.
9 V.F. Pavlov, "The effect of Viscosity change in the $800-1200^{\circ}C$ range on the Vitrification and bloating of low-refractory clays", Glass and Ceramics 17(3) (1960) 133.   DOI   ScienceOn
10 C.M. Riley, "Relation of chemical properties to the bloating of clays", J. of the American Ceram. Soc. 34(4) (1951) 121.   DOI
11 A. Barba, F. Negre, M.J. Orts and A. Escardino, "Oxidation of black coring during the firing of ceramic ware-3. influence of the thickness of the piece and the composition of the black core", British Ceramic Transactions and Journal 91 (1992) 36.
12 W.E. Brownell, "Black coring in structural clay products", J. of the American Ceram. Soc. 40(6) (1957) 179.   DOI
13 D.Y. Shin, S.M. Han and S.G Choi, "Synthesis of ceramic support for immobilization of microorganisms using fly ash", J. of the Kor. Ceram. Soc. 39(9) (2002) 859.
14 S.S. Cava, J.A. Cerri, C.A. Paskocimas, E. Longo, J.A. Varela, T. Mendonca and C.G Herter, "Suppressing Black coring in single-fire ceramic tiles by controlling kiln atmospheres", Castellon (1998) 15.
15 K.D. Kang and S.G Kang, "Properties of artificial aggregates fabricated with various heating conditions", J. Kor. Cry. Growth and Cry. Tech. 20[6] (2010) 301.   DOI   ScienceOn
16 Korea Concrete Institute, ''New Concrete Engineering", Kimundang (2007) 67.