工業副產品CFB(Circulating Fluidized Bed，簡稱CFB)副產石灰為石化工業因燃燒燃料所衍生之廢棄物，其去留已對生態環境造成沉重的負擔。此外，營建所需之砂石資源日益枯竭，開發替代產品實有迫切需要。因此以CFB副產石灰開發新型回填材料屬於一種新興之研究領域，除可解決日益嚴重之廢棄CFB副產石灰存量，亦可舒緩砂石料源短缺問題。
本研究將建立不同混合比例CFB飛灰/CFB底灰之水化模式及操作流程並利用催化劑活性激發硬石膏之水化速率，配合水化試驗、加州載重比試驗、SEM試驗、EDS試驗、X-Ray試驗、坍流度試驗及單軸壓縮試驗，探討回填材料之外部力學性質與內部微觀結構，建立CFB副產石灰歷經齡期8個月之研究成果，最後提出CFB副產石灰應用於回填材料之建議配比。
副產石灰回填材料特性在一系列試驗與分析結果顯示：(1) 當CFB飛灰比例增加時，硬石膏(CaSO4)經水化作用而生成之二水石膏(CaSO4．2H2O)含量比例將隨之增加。(2) (飛灰,底灰)=(10, 90)、(20, 80)、(30, 70)、(40, 60)四組配比，其歷經齡期8個月之CBR膨脹量趨於緩和，甚至不再膨脹，因此建議施工採用此配比。(3) 添加2%催化劑硫酸鈉有效激發CFB副產石灰之活性，提升CFB副產石灰之強度。(4) 如摻配CFB底灰比例提高，其平均抗壓強度較佳。(5) CFB副產石灰先行水化後，體積膨脹，質量變輕，試體早期強度消散，平均抗壓強度約為80~100kgf/cm2。

The industrial by-product, by-product lime in Circulating Fluidized Bed (CFB) , is a waste derived from fuel burning. The ultimate disposal of it has become a heavy burden to the ecological environment. In addition, as the sand resources needed by constructions are getting more and more exhausted day after day, there is an urgent demand to develop alternative products. As a result, the development of a new type of backfill material from CFB by-product lime is a newly emerged research field. As well as reducing the stock of the wasted CFB by-product lime that is increasing each day, the shortage issue of the sand resources can be relieved.
In the research, the hydration models of different fly ash/bottom ash proportions and the operating procedures were established. Moreover, the activity of the accelerator was used to stimulate the hydration speed of the anhydrite. Along with hydration test, the California Bearing Ratio test, SEM, EDS, X-Ray, slump flow test and axial compression test, the external mechanical property and the internal microstructure of the backfill material were investigated to establish the 8-month research results for the CFB by-product lime. The recommended proportions of CFB by-product lime in backfill material were proposed at the end.
After a series of tests and analyses, the results of applying CFB by-product lime as the backfill material showed: (1) When the proportion of the fly ash increased, the proportion of the gypsum produced by anhydrite through hydration would also increase. (2) The expansion of hydrated CFB by-product lime with the mixing ration of fly ash with bottom ash equal to(10, 90), (20, 80), (30, 70), (40, 60) , turn a quantity to be ignored. (3) By adding 2% of accelerator, the activity of the CFB by-product lime can be effectively stimulated and the strength of the CFB by-product lime can also be increased. (4) As the proportion of the bottom ash blended in increased, the average compression strength would be bettered. (5) After the hydration of CFB by-product lime, the volume increases, the weight decreases and the early strength dissipated. The average of compressive strength is 80~100kgf/cm2.

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