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http://dx.doi.org/10.14190/JRCR.2021.9.4.443

Effect of Blast Furnace Slag and Desulfurized Gypsum on Hardening of CFBC Boiler Coal Ash  

Lee, Woong-Geol (Research Center of Advanced Convergence Process on Materials, Kangwon University)
Kim, Jin-Ho (Center of Research Facilities KNU, Kangwon University)
Kim, Kyung-Nam (Department of Advanced Materials Engineering, Kangwon University)
Song, Myong-Shin (Research Center of Advanced Convergence Process on Materials, Kangwon University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.4, 2021 , pp. 443-450 More about this Journal
Abstract
The effects of blast furnace slag(BFS) and desulfurized gypsum(FDG) on the compressive strength of CFBA, and self-hydration of CFBA were studied. CFBA has self-hydrating and hardening properties, and it can be seen that the compressive strength of CFBA can be improved by using appropriate amounts of BFS and FDG. In addition, the self-hardening properties of CFBA are similar to the hydration reaction of 4CaO·Al2O3·Fe2O3 (C4AF), a cement clinker mineral, and when free-CaO, CaSO4 and CaCO3 coexist, Compressive strength of CFBA is expressed by the formation of calcium carbo compounds and hydrates of ettringite, calcium silicate, and calcium aluminate.
Keywords
Circulating fluidized bed boiler ash; Self-hardening; Calcium carbo-aluminate; Calcium carbo-ferrite; Ettringite;
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