- Volume 4 Issue 1
DOI QR Code
Experimental and SEM Analyses of Ground Fly Ash in Concrete
- Brueggen, Beth (School of Civil Engineering and Environmental Science, University of Oklahoma) ;
- Kang, Thomas H.K. (KCI Member, School of Civil Engineering and Environmental Science, University of Oklahoma) ;
- Ramseyer, Chris (School of Civil Engineering and Environmental Science, University of Oklahoma)
- Received : 2009.10.05
- Accepted : 2010.03.30
- Published : 2010.06.30
Fly ash is used in concrete to improve the fresh and hardened properties of concrete, including workability, initial hydration temperature, ultimate strength and durability. A primary limitation on the use of large quantities of fly ash in blended cement concrete is its slow rate of strength gain. Prior studies investigated the effects of grinding fly ash and fly ash fineness on the performance of concrete containing fly ash. This study aims to discover the sources of those effects, to verify the compressive strength behavior of concrete made with raw and processed Class C fly ash, and to investigate the properties of fly ash particles at the microscopic level. Concrete cylinder test results indicate that grinding fly ash can significantly benefit the early age strength as well as the ultimate strength of concrete with ground fly ash. Therefore, it is demonstrated that grinding fly ash increases its reactivity. Scanning Electron Microscopy was then used to investigate the physical effects of the grinding process on the fly ash particles in order to identify the mechanism by which grinding leads to improved concrete properties.
- Mindess, S. and Young, J. F., Concrete, Prentice-Hall, Inc., New Jersey, 1981, 671 pp.
- Slanika, S., “The Influence of Fly Ash Fineness on the Strength of Concrete,” Cement and Concrete Research, Elsevier, Vol. 21, 1991, pp. 285-296. https://doi.org/10.1016/0008-8846(91)90010-F
- Berry, E. E., Hemings, R.T., Langley, W. S., and Carette, G. G., “Beneficiated Fly Ash: Hydration, Microstructure, and Strength Development in Portland Concrete,” in V. M. Malhotra, Ed., Proceedings of Third International Conference on the Use of Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete, ACI SP 114, 1989, pp. 241-273.
- Pu, X. and Tan, K., “Strengthening Effects of Finely Ground Fly Ash, Granulated Blast Furnace Slag, and Their Combination,” Cement and Concrete Research, Elsevier, Vol. 28, No. 12, 1998, pp. 1819-1825. https://doi.org/10.1016/S0008-8846(98)00158-6
- Kiattikomol, K., Jaturapitakkul, C., and Songpiriyakij, S., “A Study of Ground Coarse Fly Ashes with Different Finenesses from Various Sources as Pozzolanic Materials,” Cement and Concrete Composites, Vol. 23, Issues 4-5, 2001, pp. 335-343. https://doi.org/10.1016/S0958-9465(01)00016-6
- Chindaprasirt, P., Jaturapitakkul, C., and Sinsiri, T., “Effect of Fly Ash Fineness on Compressive Strength and Pore Size of Blended Cement Paste,” Cement and Concrete Composites, Vol. 27, Issue 4, 2005, pp. 425-428. https://doi.org/10.1016/j.cemconcomp.2004.07.003
- Brouwers, H. J. H. and Van Eijk, R. J., “Fly Ash Reactivity: Extension and Application of a Shrinking Core Model and Thermodynamic Approach,” Journal of Materials Science, Vol. 37, No. 10, 2002, pp. 2129-2141. https://doi.org/10.1023/A:1015206305942
- Fu, X., Li, Q., Zhai, J., Sheng, G., and Li, F., “The Physical-Chemical Characterization of Mechanically-Treated CBFC Fly Ash,” Cement and Concrete Composites, Vol. 30, No. 3, 2008, pp. 220-226. https://doi.org/10.1016/j.cemconcomp.2007.08.006
- Analysis of Active Ion-Leaching Behavior and the Reaction Mechanism During Alkali Activation of Low-Calcium Fly Ash vol.12, pp.1, 2018, https://doi.org/10.1186/s40069-018-0282-3