scholarly journals Hardening Properties of Foamed Concrete with Circulating Fluidized Bed Boiler Ash, Blast Furnace Slag, and Desulfurization Gypsum as the Binder

2021 ◽  
Vol 11 (03) ◽  
pp. 301-316
Author(s):  
Seunghyun Na ◽  
Woonggeol Lee ◽  
Myongshin Song
Keyword(s):  
Blast Furnace ◽  
Fluidized Bed ◽  
Blast Furnace Slag ◽  
Circulating Fluidized Bed ◽  
Circulating Fluidized Bed Boiler ◽  
Foamed Concrete ◽  
Furnace Slag ◽  
Boiler Ash

Investigation on Blending CFB Ash with Blast Furnace Slag as Replacement for Portland Cement Used in Concrete Binders

2013 ◽  
Vol 723 ◽  
pp. 623-629 ◽  
Author(s):  
Guan Yu Chen ◽  
Wei Hsing Huang
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Petroleum Coke ◽  
Blast Furnace Slag ◽  
Circulating Fluidized Bed ◽  
Slag System ◽  
Ash Content ◽  
Chemical Compositions ◽  
Volume Stability ◽  
Furnace Slag

Circulating Fluidized Bed (CFB) Boiler is a means of energy-generating process by burning petroleum coke. In order to avoid blazed petroleum coke with high sulfur content from emitting overdosed sulfur dioxide, limestone is introduced in the boiler for desulfuration. The residue collected from the boiler is called CFB ash. In accordance with different boiler position, CFB ashes can be classified as fly ash and bed ash, and both have similar chemical compositions, with high contents of gypsum and calcium oxide. In this study, CFB ash (fly ash) is mixed with blast furnace slag (BFS) as a substitute for cement in making concrete. It is intended that CFB ashes can be used in concrete and a method for proportioning CFB ash in concrete can be developed. The results show that CFB ash can react with cement to produce hydration products such as Ca(OH)2, and bring the activation of blast furnace slag. The paste strength could be low at later ages, if the CFB ash content is too low. Whereas, if the CFB ash content is over 30%, the paste strength will be low at the early age. Therefore, it is concluded that the cement-granulated blast furnace slag system will show best performance at the CFB ash content between 18% and 22%. In autoclave soundness test shows the CFB ash of the high f-CaO content is easy reaction in the water, and also did not negatively affect the quality of the volume stability.

scholarly journals Use of fly ash from fluidized bed boilers in clinker-slag-ash based binders

2018 ◽  
Vol 174 ◽  
pp. 02002
Author(s):  
Elżbieta Janowska-Renkas ◽  
Jolanta Kowalska
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Fluidized Bed ◽  
Blast Furnace Slag ◽  
Building Materials ◽  
Corrosive Environment ◽  
Fly Ashes ◽  
Fluidized Bed Boilers ◽  
Furnace Slag ◽  
Fbc Fly Ash

The study presents the state of knowledge regarding physical and chemical properties, as well as trends for application of fly ashes from combustion in fluidized bed boilers in building materials. Clinker - slag - ash based binders were tested that contained up to 40 mass % of fly ashes from combustion in fluidized bed boilers. It was demonstrated that fluidized bed combustion fly ashes (FBC fly ash), apart from granular blast furnace slag, could be the ingredient of low clinker Portland cements (ca. 20% by mass). These cements, compared to CEM I Portland cement, have higher water demand and durability in the corrosive environment, and a lower compressive strength value. Based on test results of binders with various content of blast furnace slag and fly ash, the clinker - slag - ash based binder was singled out, which demonstrated the higher durability in the corrosive environment. It was found that production of clinker - slag - ash based binders was possible in the strength class 32.5 even with 30% by mass of FBC fly ash content.

scholarly journals Properties of Matrix using Diatomite Based on Blast Furnace Slag

2019 ◽  
Vol 8 (2S6) ◽  
pp. 112-116
Keyword(s):  
Blast Furnace ◽  
Water Absorption ◽  
Indoor Air ◽  
Blast Furnace Slag ◽  
Indoor Air Pollution ◽  
Circulating Fluidized Bed ◽  
Fine Dust ◽  
Fluidized Bed Combustion ◽  
Replacement Ratio ◽  
Furnace Slag

we have experimented to reduce fine dust which is a problem in the world. Fine dust is known to cause various diseases in the human body. Diatomite with adsorption characteristics was used to reduce fine dust, which is a source of indoor air pollution. As a binder, blast furnace slag and a circulating fluidized bed combustion boiler fly ash were used to replace cement. The assessment items are flexural strength, compressive strength, flow ability, density, water absorption, fine dust concentration. As the replacement ratio of diatomite increases, the density decreases and the water absorption tends to increase. It is considered that this is due to the porous property of diatomite. Flowability decreased with increasing diatomite replacement ratio. As the replacement ratio of diatomite increased, the amount of air content to increase. As the replacement ratio of diatomite increased, the adsorption performance per minute of fine dust increased. This is because the amount of fine dust adsorbed per specific surface area increased as the replacement ratio of diatomite having porous properties increased. If additional experiments are done and used for finishing materials, it will contribute to the improvement of indoor air quality.

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