- 期刊
循環流化床灰混凝土工程性質之研究
EFFECTS OF CFBC ASH ON ENGINEERING PROPERTIES OF CONCRETE
摘要
循環流化床灰具自硬性且溶於水時呈高濃度鹼性，可利用其做為膠結料與鹼激發劑。本研究分兩階段，第一階段測試4種不同CFBC灰（以下稱A灰、B灰、C灰與D灰）與不同比例之灰漿組成對抗壓強度的影響；第二階段藉由前者試驗結果取較佳之兩種CFBC灰製作砂漿試體，探討其物理性質、力學性質與耐久性。第一階段試驗結果A灰與B灰抗壓強度符合設計強度（20 MPa），故使用A灰與B灰進行後續試驗；第二階段試驗結果顯示當A灰用量增加時，吸水率從16.5%增加到21%、28天抗壓強度從60.8 MPa減少到31.6 MPa、最大乾燥收縮為2824 μ；當B灰用量增加時，吸水率從26.6%增加到31.9%、28天抗壓強度從32.1 MPa減少到23.8 MPa、最大乾燥收縮為1976 μ；而耐磨性則無明顯變化；以上結果表示B灰乾燥收縮較A灰小，但其他之工程性質則A灰優於B灰。
並列摘要
The study examines the potential of using circulating fluidized bed combustion (CFBC) ash, which exhibits self-hardening properties and high alkalinity when dissolved in water, as a binder and alkali activator to stimulate ground granulated blast furnace slag (GGBFS). Firstly, the impact of four different CFBC ashes (referred to as ash A, ash B, ash C, and ash D) and varying proportions of ash paste compositions on compressive strength is tested. Secondly, based on the results of above, two of the most favorable CFBC ashes are selected to produce mortar specimens, to explore the effects of CFBC ashes on the physical, mechanical, and durability properties of the mortar specimens. The results of the first stage indicate that when the water-cement ratio is 0.3, both ash A and ash B meet the design compressive strength (20 MPa) at 14 days. Therefore, ash A and ash B were used for the subsequent tests. The results of the second stage test show that when the amount of ash A increases, the water absorption rate increases from 16.5% to 21%, the compressive strength decreases from 60.8 MPa to 31.6 MPa at 28 days, and the maximum drying shrinkage is 2824 μ. When the amount of ash B increases, the water absorption rate increases from 26.6% to 31.9%, the compressive strength decreases from 32.1 MPa to 23.8 MPa at 28 days, and the maximum drying shrinkage was 1976 μ. However, the wear resistance does not show significant changes. Based on the above results, they indicate that the drying shrinkage of ash B is smaller than that of ash A, but for other engineering properties, ash A performs better than ash B.