| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 103 === Circulating fluidized bed combustion (CFBC) is an advanced and promising combustion technology for power generation, which has been installed in Taiwan recently. After the combustion process, the coals turn into the combustion solid wastes - CFBC fly ashes, which have the potential instead of cementing materials due to their cementitious characteristics. Recently environmental protection and sustainability have been taken into account by many people in the world. Hence, how to develop a better use of CFBC fly ash with the by-products- granulated blast furnace slag and coal-fired fly ash is an urgent and important task.
Test results indicate that proper addition of CFBC fly ash, ground granulated blast-furnace slag, and coal fly ash to concrete would lead to an excellent performance in slump. If added amount of CFBC fly ash and ground granulated blast-furnace slag exceeds 50%, the workability of concrete would degrade. The factor that affects slump includes the shape and size of pozzolan. At the 28thday of concrete age, replacing the cement with CFBC fly ash, ground granulated blast-furnace slag, and coal fly ash by respectively 10% will provide a better compressive strength. If replacing 10% of the concrete with CFBC fly ash alone, the test specimen will have an expansion in volume. If replacing concrete with a mix of ground granulated blast-furnace slag and coal fly ash, the expansion can be efficiently controlled.
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