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http://dx.doi.org/10.14481/jkges.2016.17.12.17

The Characterization of Controlled Low Strength Material (CLSM) Using High CaO Fly Ash without Chemical Alkaline Activator  

Lim, Sanghyeong (School of Civil, Environtmental and Architectural Engineering, Korea University)
Choo, Hyunwook (School of Civil, Environtmental and Architectural Engineering, Korea University)
Lee, Woojin (School of Civil, Environtmental and Architectural Engineering, Korea University)
Lee, Changho (Department of Marine and Civil Engineering, Chonnam National University)
Publication Information
Journal of the Korean GEO-environmental Society / v.17, no.12, 2016 , pp. 17-26 More about this Journal
Abstract
The experimental investigation aims at developing controlled low strength materials (CLSM) using a self-cementitious fly ash (FA) as a binder and a bottom ash (BA) as a aggregate. The fly ash and bottom ash used in this study were obtained from a circulating fluidized bed combustion boiler (CFBC) which produces relatively high CaO containing fly ash. To find the optimum mixing condition satisfying flow consistency and unconfined compression strength (UCS), the CLSM specimens were prepared under various mixing conditions, including two types of aggregate and different weight fractions between fly ash and aggregate. Additionally, the prepared specimens were evaluated using a scanning electron microscope (SEM) and X-ray diffraction (XRD). The results of this study demonstrate that the water content satisfying flow consistency ranges from 42% to 85% and the flowability is improved with increasing the fraction of aggregate in whole mixture. The USC ranges from 0.3 MPa to 1.9 MPa. The results of UCS increases with increasing the fraction of aggregate in FA-sand mixtures, but decreases with increasing the fraction of aggregate in FA-BA mixtures. SEM images and XRD patterns reveal that the occurrence of both geopolymerization and hydration. The results of this study demonstrate that CFBC fly ash could be used as an alternative binder of CLSM mixtures.
Keywords
Controlled Low Strength Material (CLSM); High CaO fly ash; Non-classified fly ash; Geopolymer; Self-cementation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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