Abstract
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.
Highlights
A contemporary cement industry is formed by actions aiming at reduction of CO2 emissions, saving of natural resources, reduced outlays, on energy used, etc. [1]
The clinker – slag – ash based mortars were used for testing, with different composition, which had the content of blast furnace slag and fly ashes from fluidized bed combustion (FBC fly ash) from 10% to 40% by mass
Simultaneous application of blast furnace slags and FBC fly ashes allows for additional sealing of the cement matrix, which is confirmed by authors of work [3]
Summary
A contemporary cement industry is formed by actions aiming at reduction of CO2 emissions, saving of natural resources, reduced outlays, on energy used, etc. [1]. Fly ashes coming from coal combustion in fluidized bed boilers are a continuously growing group of combustion process by-products [1,2,3,4,5,6,7]. It mainly results from the increasing number of this type of furnaces, due to necessity to reduce SO2 and nitrogen oxides emission to air. Main phases of fly ashes from the fluidized bed combustion are dehydrated minerals that form a waste rock if a primeval character, unreacted sorbent (CaCO3), free CaO and anhydrite [1,2,3,4,5,6]. The objective of the study was to determine composition of the clinker – slag – ash based binder, which allowed to get higher durability pastes with possible largest content of fly ashes from fluidized bed combustion (FBC fly ash)
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