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KMID : 1024520170260111267
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Journal of the Environmental Sciences
2017 Volume.26 No. 11 p.1267 ~ p.1274
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Characterization of Controlled Low-Strength Materials Utilizing CO2-Solidified CFBC Coal Ash
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Cho Yong-Kwang
Nam Seong-Young
Lee Yong-Mu
Kim Chun-Sik
Seo Shin-Seok
Jo Sung-Hyun
Lee Hyoung-Woo
Ahn Ji-Whan
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Abstract
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A Controlled Low-Strength Materials (CLSM) is suitable for mine backfilling because it does not require compaction owing to it high fluidity and can be installed quickly. Therefore, a CLSM utilizing CO2-solidified Circulating Fluidzed Bed Combustion (CFBC) coal ash was developed and it's properties were investigated, since. CO2-solidification of CFBC coal ash can inhibit exudation of heavy metals. The chemical composition and specific surface area of Pulverized coal Combustion fly ash and CFBC fly ash were analyzed. The water ratio, compressive strength and length change ratio of CLSM were confirmed. The water ratios differed with the specific surface area of the CLSM. It was confirmed that the porosity of CLSM affected its compressive strength and length change ratio.
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KEYWORD
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Coal ash, Fly ash, Bottom ash, Backfill, Wast mine, Material
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