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Elucidating the Pozzolanic Characteristics of Pastes Containing CirculatingFluidized Bed Fly Ash

The aim of this study is to investigate the pozzolanic characteristics of circulating fluidized bed fly ash blended cement (CFBFABC) paste containing circulating fluidized bed fly ash (CFBFA). The initial and final setting time of CFBFABC pastes with CFBFA retards with an increasing CFBFA content. CFBFABC pastes containing 10% CFBFA exhibited a compressive strength similar to that of ordinary Portland cement pastes at the ages of 90 days. X-ray diffrac- tion peaks indicated the presence of portlandite, ettringite, and unreacted C 3 S (32.6°) and C 2 S (41.9°). The gel/space ratio of the CFBFABC pastes increased with the curing time and decreased as the CFBFA content increased. The gel/space ra- tio increased with the curing time because of the progress of hydration, which led to some of the pores being filled. At the ages of 90 days, the gel/space ratio of the CFBFABC pastes containing 10% CFBFA increased to approximately 14%, it is possibly the consumption of Ca(OH) 2 and the formation of C-S-H in the CFBFABC pastes. The CFBFABC pastes con- taining 10% CFBFA did not exhibit any major decrease in the gel/space ratio. It exhibited favorable mechanical character- istics that were observed when the mixing ratio of CFBFA was 10%. Furthermore, CFBFA has the potential, as a pozzo- lanic material, partially to replace ordinary Portland cement.