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A Study on Physical Properties of Mortar Mixed with Fly-ash as Functions of Mill Types and Milling Times

  • Seo, Sung Kwan (Energy & Environmental Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Chu, Yong Sik (Energy & Environmental Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Shim, Kwang Bo (Division of Materials Science and Engineering, Hanyang University) ;
  • Jeong, Jae Hyun (Energy & Environmental Division, Korea Institute of Ceramic Engineering and Technology)
  • Received : 2016.01.27
  • Accepted : 2016.07.07
  • Published : 2016.07.31

Abstract

Coal ash, a material generated from coal-fired power plants, can be classified as fly ash and bottom ash. The amount of domestic fly ash generation is almost 6.84 million tons per year, while the amount of bottom ash generation is 1.51 million tons. The fly ash is commonly used as a concrete admixture and a subsidiary raw material in cement fabrication process. And some amount of bottom ash is used as a material for embankment and block. However, the recyclable amount of the ash is limited since it could cause deterioration of physical properties. In Korea, the ashes are simply mixed and used as a replacement material for cement. In this study, an attempt was made to mechanically activate the ash by grinding process in order to increase recycling rates of the fly ash. Activated fly ash was prepared by controlling the mill types and the milling times and characteristics of the mortar containing the activated fly ash was analyzed. When the ash was ground by using a vibratory mill, physical properties of the mortar mixed with such fly ash were higher than the mortar mixed with fly ash ground by a planetary mill.

Acknowledgement

Supported by : Ministry of Land, Infrastructure & Transport

References

  1. B. P. Kumar and R. Sharma, "Effect of Fly Ash on Engineering Properties of Expansive Soils," J. Geotech. Geoenviron. Eng., 130 [7] 764-67 (2004). https://doi.org/10.1061/(ASCE)1090-0241(2004)130:7(764)
  2. H. S. Kim, The Development and Application of Environment-Friendly Concrete Using Coal Ash(in Korean), pp. 10-4, in Master Thesis, Seoul National University of Science and Technology, Seoul, 2008.
  3. O. Sengul, and M. A. Tasdemir., "Compressive Strength and Rapid Chloride Permeability of Concretes with Ground Fly Ash and Slag," J. Mater. Civ. Eng., 21 [9] 494-501 (2009). https://doi.org/10.1061/(ASCE)0899-1561(2009)21:9(494)
  4. C. C. Wiles, "Municipal Solid Waste Combustion Ash : State of the Knowledge," J. Hazard. Mater., 47 [1] 325-44 (1996). https://doi.org/10.1016/0304-3894(95)00120-4
  5. S. I. Kim, J. K. Lee, and C. H. Jeon, "A Study on the Combustion Characteristics of R-UBC in a Drop Tube Furnace"; pp. 93-4 in Proceedings of the Korean Society of Combustion - 48th KOSCO Symposium, Seoul, 2014.
  6. H. Justnesa, L. Elfgren and V. Ronin, "Mechanism for Performance of Energetically Modified Cement Versus Corresponding Blended Cement," Cem. Concr. Res., 35 [1] 315-23 (2005). https://doi.org/10.1016/j.cemconres.2004.05.022
  7. N. Bouzoubal, M. H. Zhang, A. Bilodeau, and V. M. Malhotra, "The Effect of Grinding on the Physical Properties of Fly ash and a Portland Cement Clinker," Cem. Concr. Res., 27 [12] 1861-74 (1997). https://doi.org/10.1016/S0008-8846(97)00194-4
  8. M. N. Haque1 and O. Kayali, "Propertiese of High-Strength Concrete Using a Fine Fly Ash," Cem. Concr. Res., 28 [10] 1445-52 (1998). https://doi.org/10.1016/S0008-8846(98)00125-2
  9. H. Justnes, L. Elfgren, and V. Ronin, "Mechanism for Performance of Energetically Modified Cement versus corresponding Blended Cement," Cem. Concr. Res., 35 [1] 315-23 (2005). https://doi.org/10.1016/j.cemconres.2004.05.022
  10. H. Justnes, P. A. Dahl, V. Ronin, J.-E. Jonasson, and L. Elfgren, "Microstructure and Performance of Energetically Modified Cement (EMC) with High Filler Content," Cem. Concr. Compos., 29 [7] 533-541 (2007). https://doi.org/10.1016/j.cemconcomp.2007.03.004
  11. Gabor Mucsi, "Grindability of Quqrtz in Stirred Media Mill," Part. Sci. Technol., 31 399-406 (2013). https://doi.org/10.1080/02726351.2013.767294