未燃焼カーボンを含有するフライアッシュを原料とした硬化体のケイ石廃泥添加による高強度化

概要

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Calcium silicate briquettes were prepared from raw materials of fly ash and lime by autoclaving at 180℃. The fly as was supplied from a fluidized bed boiler and contained 29 wt% unburned carbon. The briquette with the bending strength of 15 MPa and the bulk density of 1.44 Mg/m^3 was obtained by autoclaving for the duration of 12 to 24hrs at Ca/Si=1.0. The addition of NaOH lowered the crystallinity of hydrogarnet in the briquette and decreased the bending strength. To improve the strength, waste silica containing 85 wt% quartz was added to the fly ash in the ratio from 0.15 to 0.75 as SiO_2. The bending strength increased to 25 MPa with the addition of waste silica until the ratio of 0.5 when 1N-NaOH was added. Without NaOH, the strength was not so much increased by the addition of waste silica below the ratio of 0.3.
社団法人日本材料学会の論文
1995-02-15