A Study on the Manufacturing of Energetically-Modified Reject Fly Ash and the Characteristics of Mortar Jeong, Jae Hyun; Chu, Yong Sik; Yi, Chong Ku; Seo, Sung Kwan; Kwon, Duk Young;
Energetically-modified material using reject fly ash (RFA), generated from thermal power plants, was manufactured to investigate the effect of the material on the physical and chemical characteristics of cement mortar. In order to modify reject fly ash, a vibration mill was used. Particle size, grain shape, and crystal structure of the ash were analyzed. Then, the compressive strength of the mortar using energetically-modified reject fly ash (ERFA) was measured. Microstructure and X-ray diffraction (XRD) patterns were also used in the analysis. As the replacement rate of ERFA increased, the value of the compressive strength tended to decrease. However, it was found that the compressive strength values of 7 and 28 days-cured specimens were higher than those of conventional ordinary Portland cement (OPC) mortar with 10 % replacement rate condition.
Mortar;Concrete;Thermal power plant;Fly ash;Energetically-modified powder;
J. H. Maeng, T. Y. Kim, and D. H. Seo, Minimizing Environmental Impact in Accordance with the Thermal Power Plant Ash Management; Korea Environment Institute, Sejong, 2014.
K. J. Bae, KISTI Market Report; Vol. 3, pp. 15-6, Korea Institute of Science and Technology, Seoul, 2013.
S. C. Kou and F. Xing, "The Effect of Recycled Glass Powder and Reject Fly Ash on the Mechanical Properties of Fibre-Reinforced Ultrahigh Performance Concrete," Adv. Mater. Sci. Eng., 2012  33-5 (2012).
S. C. Kou and C. S. Poon, "Properties of Self-Compacting Concrete Prepared with Coarse and Fine Recycled Concrete Aggregates," Cem. Concr. Compos., 31  622-27 (2009).
S. K. Antiohos and S. Tsimas, "A Novel Way to Upgrade the Coarse Part of a High Calcium Fly Ash for Reuse into Cement Systems," Waste Manag., 27  675-83 (2007).
H. Justnes, P. A. Dahl, V. Ronin, J. E. Jonasson, and L. Elfgren, "Micostructure and Performance of Energetically Modified Cement (EMC) with High Filler Content," Cem. Concr. Compos., 29  533-41 (2007).
J. S. Robach and I. M. Robertson, "In-situ Transmission Electron Microscopy Observations and Molecular Dynamics Simulations of Dislocation-Defect Interaction in Ion-Irradicated Copper," Philos. Mag., 83  955-67 (2003).
C. Park and Y. J. Son, "The Study of Correlations between Concrete Air and the Loss OF lgnition of Fly Ash," J. Archit. Inst. Korea, 32  545-46 (2012).
I. Kulaots, R. H. Hurt, and E. M. Suuberg, "Size Distribution of Unburned Carbon in coal fly ash and its Implications," Fuel, 83  223-30 (2004).
J. Temuujin, R. P. Williams, and A. V. Riessen, "Effect of Mechanical Activatin of Fly Ash on the Properties of Geoplymer Cured at Ambient Temperature," J. Mater. Process. Technol., 209 [12-13] 5276-80 (2009).
M. Criado, A. Fernandez-Jimenez, A. G. de la Torre, M. A. G. Aranda, A. Palomo, "An XRD Study of the Effect of the $SiO_2$/Na2O Ratio on the Alkali Activatin of Fly Ash," Cem. Concr. Res., 37  671-79 (2007).
G. Pacchioni, L. Skuja, and D. Griscom, Defects in $SiO_2$ and Related Dielectrics: Science and Technology; pp. 339-70, Springer Science & Business Media, Berlin, 2012.
Y. Wang, Performance Assessment of Cement-Based Materials Blended with Micronized Sand : Microstructure, Durability and Sustainanility, pp. 10-1, in Ph.D. Thesis, Delft University of Technology, Delft, 2013.
A. L. A. Fraay, J. M. Bijen, and Y. M. de Haan, "The Reaction of Fly Ash in Concrete a Critical Examination," Cem. Concr. Res., 19  235-46 (1989).
S. J. Barnett, M. A. Halliwell, N. J. Crammond, C. D. Adam, and A. R. W. Jackson, "Study of Thaumasite and Ettringite Phases Formed in Sulfate/Blast Furnace Slag Slurries Using XRD Full Pattern Fitting," Cem. Concr. Compos., 24  339-46 (2002).