Gamma-C2S Synthesis from Fly Ash of Fluidize-Bed Boiler for CO2 Capture

S. Naa, S. Kangb, S. Leeb, M. Songa aResearch Center of Advanced Convergence Processing on Materials, Kangwon National University, Samcheok, Republic of Korea bDept. of Advanced Materials Engineering, Kangwon, National University, Samcheok, Republic of Korea

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This paper describes the CO2 capture performance of cement blended paste incorporating gamma-dicalcium silicate (gamma-C2S) made with industrial by-products, by taking into consideration of effect of CaCO3, fly ash replacement ratio under the sintering process. X-ray diffraction method was conducted in order to quantitatively investigate the gamma-C2S content. CO2 capture performance of mortar sample incorporating gamma-C2S was investigated by means of compressive strength test using accelerated carbonation chamber. The experimental results revealed that the kind of CaCO3 would affect the affect the formation of gamma-C2S after the sintering with respect to the XRD-Rietveld analysis. Moreover, it is confirmed that compressive strength of mortar sample incorporating gamma-C2S has the same tendency at curing age of 3, 7 and 28days. Blended mortar sample made with 10 wt.% replacement ratio of gamma-C2S had high compressive strength value compared to normal mortar sample, therefore, incorporating gamma-C2S had a positive effect on the compressive strength after accelerated carbonation. Finally, the waste foundry sand powder may be alternative to produce gamma-C2S.

DOI: 10.12693/APhysPolA.127.1282 PACS numbers: 81.05-t